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Wednesday 16 January 2013

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Monday 14 January 2013

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Marine engineering practices question

Question 2 Which of the following can lead to premature failure of roller bearings? ans------A. Misalignment B. Contamination C. Shrinkage D. Over greasing Question 3 Time Remaining: Vacuum priming pumps which work on the principle of fixed vane pumps require _____________ for___________ clearance between vane tips and casing. A. Lube oil, lubricating B. Lube oil, sealing ans-------C. Water, sealing D. Gland packing, sealing *Question 4 Increasing the rotational speed of a cargo pump the pump flow rate will: ans------A. Increase in direct proportion to the increase in speed B. Decrease in direct proportion to the increase in speed C. Flow rate doesn???t depend upon speed D. Flow Question 5 Time Remaining: The flow rate through a F.O. transfer pump will not be affected by which of the following factors? A. Low F.O. temperature B. Low sounding in F.O. tank C. Internal leakage within the pump ans------D. Leaking discharge valve Question 6 Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :- A. Increasing cylinder oil feed rate ans------B. Using high TBN cylinder oil C. Increasing scavenge air temperature D. Decreasing cylinder oil feed rate 7. when A/E stand by F.O.heater in use of main engine a. Sudden opening F.O. inlet valve pressurized and damage the heater b. F.O. in vapour lock inside heater allow steam c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not pressurized may cause sudden change in engine /per load/rpm d. heater leaking. 8. Incorrect sampling point oil analysis in ship a. L.O. outlet b. L.O. cooler I/T & O/T c. Main supply Line d. Purifier O/T 9. Types of corrosion in fresh water of D/E a. Stress b. Hot corrosion c. bimetallic d. selective phase corrosion 10. Not preventing cold corrosion in M/E component a. Running Evy aat high load b. J/W cooling temp. high c. High TNB cylinder oil d. Cooling charge air in air cooler dew point. 11. Super chlorinating of fresh water tanks in dry dock is done by: A. Washing the tanks with 100ppm chlorine solution B. Washing the tanks with 50ppm chlorine solution C. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean water D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water 12. A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out? a. The ball and seat can be lapped together b. The ball can be machined while the seat can be replaced c. Normally both the non-metallic seats get worn out and have to be replaced d. Normally ball gets damaged and has to be replaced 13. maintaining correct discharge pressure, soon ceases to discharge water what are possible cause? A. Pressure gauge wrong B. Pump sucking air C. Discharge valve throttled D. Casing wear ring is worn ANS IS B OR C 14. An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you (a) Continue to run the engine and wait for some time (b) Stop the engine for a while and make some checks (c) Reduce the load of the engine (d) Run it on steady load to make some checks. 15. During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged B) Reduce the vacuum further to control the relative expansion C) Keep manoeuvring irrespective of damage to the turbines D) Request the bridge to try to reduce number of astern movements 16.Refer cooling tubes act as self-cooling & expansion by a) Straight tube b) U tube c) Spring tube 17. How is manual desludging carried out if automatic fails in purifier? hat will be your first step of action? • 18. Super chlorinating of fresh water tanks in dry dock is done by: A. Washing the tanks with 100ppm chlorine solution B. Washing the tanks with 50ppm chlorine solution C. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean water D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water • 19. A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out? A. The ball and seat can be lapped together B. The ball can be machined while the seat can be replaced C. Normally both the non-metallic seats get worn out and have to be replaced D. Normally ball gets damaged and has to be replaced • 20. Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing • 21. Resistance to corrosion of Aluminium alloys is due to : A. Aluminium being a very noble metal when compared to other metals in Electrochemical series B. Formation of Aluminium oxide(Alumina) passive film on surface C. The rate of corrosion is very low due to very high corrosion potential D. All of the above. • • • 22. For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W. temperature through the cooler has decreased from 12 deg. C to 7 deg. C over a period of time, while the drop in temperature of L.O. across the cooler has also decreased. All other coolers have been reported to be working normal & M/E is also running at a constant load in calm weather. What is the inference drawn by decrease in the temperature difference? A. The cooling S.W. inlet temperature has reduced B. The efficiency of the cooler has increased over a period of time C. The cooler has become dirty on the S.W. side or L.O. side D. S.W. side of the cooler may be partially blocked with mud and sea shells • 23. Graphitisation is the term used to describe: a) Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite b) Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to loss of strength c) Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion d) Chemical reaction between pure graphite and iron so as to increase the graphite content of iron • 24. Accelerated corrosion due to removal of protective surface films (e.g.) oxide layers on metal/alloy surfaces due to turbulence of working fluid is known as a) Bimetallic corrosion b) Impingement corrosion c) Cavitation erosion d) Selective phase corrosion • 25. When one of the M/E F.O heater is not in use, then: a) The F.O. inlet & outlet valves should be kept shut, by steam heating valves should be kept crack open, so as to keep the heater warm b) F.O inlet & outlet valves should be kept shut, steam heating valves also should be completely shut and heater should be drained of any remaining F.O c) F.O inlet and outlet valves should be kept crack open so that the F.O recirculation through the heater can take place d) F.O inlet valve should be kept shut while the outlet valve should be left open, so that heater can be put into use as fast as possible in case required • 26. After over hauling reciprocal pump the motor connections were wrongly given. Determine outcome when pump is started? A) The direction of flow will remain unaffected B) the direction of flow will be reversed C) The pump will get damaged because the suction valve will block the reverse flow causing overpressure leading to pump breakdown. D) The pump will lose suction N there will be no flow. • 27. Sludge pump suction pressure is going full vacuum when u start the pump taking water of double bottom tank suction u have checked the suction filter N found in clean condition. Taking suction from fuel oil sludge tank does not happen. Causes of the problems. A) Pump is not working efficiently n reqd. overhauling B) F.O sludge tank suction valve is leaking C) W.O. tank D.B. tank suction pipeline has a blockage. D) Can’t say what is the problem but definitely the pump needs to be opened up for overhaul • 28. Which of the following is a true statement (single choice) A) Aluminium will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte. b) Stainless steel will be subject to preferential corrosion when in electrical continuity with mild steel in presence of an electrolyte. C) Copper will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte d) Aluminium will be subject to preferential corrosion when in electrical continuity with zinc in presence of an electrolyte • . 28. Surface preparation of steel surfaces, prior carrying out painting isimportant because (choose the best alternative): A. Any rust and contaminant inclusions may cause local paint film breakdown B. Too much paint will be consumed if surface preparation is not carried out C. Surface will be very rough if proper surface preparation is not carried out D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes strong bonding • 29. In refrigeration circuit, the data logger will record what?(multi choice) 1. Room temperature 2. Recharge temperature 3. Liquid line temperature 4. Solenoid valve operation • 30. A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing? A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat • 31. After maintaining correct discharge pressure, soon ceases to discharge water what are possible cause? A. Pressure gauge wrong B. Pump sucking air C. Discharge valve throttled D. Casing wear ring is worn ANS IS B OR C • 31. An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you (a) Continue to run the engine and wait for some time (b) Stop the engine for a while and make some checks (c) Reduce the load of the engine (d) Run it on steady load to make some checks. • 32. During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged B) Reduce the vacuum further to control the relative expansion C) Keep manoeuvring irrespective of damage to the turbines D) Request the bridge to try to reduce number of astern movements • 33. Cold and viscous lubricating oil of an auxiliary engine is most likely to cause ___________ A) Sudden stopping of the engine B) Difficulty in starting the engine C) Rhythmic knocking sound from inside the engine D) Drop in RPM of the engine • 34. Normally so called??? Single screw pumps??? Are used as sludge pumps in engine room. What is correct technical name of these pumps? a) Snake pump b) Screw pump c) Progressive cavity pump d) Gerotor pump or gyrator pump • • 35. Vacuum priming pumps which work on the principle of fixed vane pumps require _____________ for___________ clearance between vane tips and casing. A. Lube oil, lubricating B. Lube oil, sealing C. Water, sealing D. Gland packing, sealing 36. viscosity of fuel oil used for ME was 145cst,new fuel comes whose viscosity was more than earlier, what should u do a) increase temp setting b) change setting of viscotherm c) do nothing d) open steam valve manually more • 37. Refer cooling tubes act as self-cooling & expansion by a) Straight tube b) U tube c) Spring tube d) • 38. Air compressor cooler tube type a) Spring type b) Floating type c) Fixed tube d) U tube 39. Purifier leaking bowl opened, cleaned n seal ring changed n putback bt still leaking wat might b wrong a. high temp b. high density c. disc size nt proper d. rpm low 40.-centrifugal pp dismantled without marking hw to reassemble(3 ques on dis) 1)if pp is single stage 2)if pp is multisatge wid oppsite eye 3)if pp is double entry impeller 41.-degree of motion 42.-purifier nt rotating wid desired rpm.reason frequency low/busbar vtg low/friction pads worn out 43.-wat kind of corrosion if outlet of heat xchngr throttled n der is turbulence in HX 44-wat vil lead to overload trip in centrifugal pp worn brg/tight gland packing/cavitation 45.-sudden shut down of engine.reason (multiple choice) air in fuel/water in fuel/water in air filter 46. You have started pumping out a Fore peak tank. The ballast pump is running showing a low discharge pressure but a positive suction pressure,Chief Engineer asks you to throttle the discharge valve to increase the back pressure on the pump. Why do you require to do the same? A. The pump???s discharge rate needs to be controlled as it is pumping at a higher than rated capacity B. Chief Engineer wants you to slow down as the deballasting is going on too fast and will finish sooner than expected C. It is a misconception that pumps operate smoothly at increased back pressure and throttling of the discharge valve is a wrong practice D. Centrifugal pumps cannot operate at greater than rated capacity, so throttling the discharge valve is only going to decrease the discharge rate below rated capacity 47.After maintaining correct discharge pressure , soon ceases to discharge water what are possible cause? (multiple choice) A. Pressure gauge wrong B. Pump sucking air C. Discharge valve throttled D. Casing wear ring is worn 48.Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing 49.Process of enrichment of surface of steel and and steel alloys by zinc using Electroplating is known as A. Cathodisation B. Galvanisation C. Neutralisation D. Dezincification 50.Which of the following is an important requirement for proper functioning of sacrificial anode system :- A. Good Insulation between anodes and ship???s hull B. Good electrical continuity between anodes and ship???s hull C. Providing protection of anodes from being painted over during hull painting D. Presence of an insulating material between anode and the cathode 51.The machinery which is usually tested first once the ship reaches a dry dock is A. Engine room crane B. Engine room lift C. Gantry crane for engine room D. All of the above 52.A recently completely overhauled Engine room bilge pump was working efficiently.Suddenly one day you find that the pump is not taking suction. You have tried priming with sea but still the pump doesn???t take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative. A. The bucket rings have worn out B. The suction or discharge valve must have worn out and started leaking C. The suction or discharge valve might be stuck in one position or some debris mighthave lodged itself in between the valve and the seat D. Pump suction filter might be clogged 53. when A/E stand by F.O.heater in use of main engine a. Sudden opening F.O. inlet valve pressurized and damage the heater b. F.O. in vapour lock inside heater allow steam c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not pressurized may cause sudden change in engine /per load/rpm d. heater leaking. 54. maintaining correct discharge pressure, soon ceases to discharge water what are possible cause? A. Pressure gauge wrong B. Pump sucking air C. Discharge valve throttled D. Casing wear ring is worn ANS IS B OR C 55.Refer cooling tubes act as self-cooling & expansion by a) Straight tube b) U tube c) Spring tube 56.The main disadvantages of a reciprocating pump over a Gear pump is that: A. A gear pump is self priming while a reciprocating pump is not B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed C. The discharge of reciprocating pump is pulsating and discharge rate is lesser D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used 57. What to check if Engine is not taking load.? a. Water tightness to be checked. b. Air to be removed from jacket water outlet line. c. Priming lube oil pump to run before starting the engine. d. Check the lube oil level. e. Check the flow of lube oil. f. Blow through the engine before starting. all d above things shd b checked 58. In refrigeration circuit, the data logger will record what?(multi choice) 1. Room temperature 2. Recharge temperature 3. Liquid line temperature 4. Solenoid valve operation 59.Correct method of greasing a centrifugal pump bearing is: A. To pump the grease until you feel high back pressure on the Grease pump B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug,until all the old grease is removed and new grease starts coming out of the drain, repeating samefor each bearing. the drain plug should then be replaced 60. WHICH PROCESS IS NOT DONE ON MILD STEEL ..???? options were hot plating, electrolysis, explosion bonding, metal spraying 61.The diameter of the branch suction pipe referred to in item 118 shall not be less than that derived in accordance with the following formula, taken to the nearest 5 mm: 62.Lowercase d equals 25 millimeters plus 2.16 times the square root of the product of C times the sum of B and uppercase D where: d - is the internal diameter of the branch suction pipe, in millimetres C - is the length of the cargo hold, in metres B - is the greatest moulded breadth of the ship in metres D - is the moulded depth of the ship to freeboard deck, in metres d=2.16*sq root[C(B+D)] +25 mm 63.Which of the group of method are used for priming of centrifugal pumps onboard ships? A. Gravity tank, attached vacuum pump B. Attached Vacuum pump, filling pump casing using a fresh water hose C. Central priming system, attached vacuum pump, sea water priming D. None of the above 64.The crank web deflection readings of a diesel engine would be erroneous in which of the following conditions? A. When the draught of the vessel has changed while readings were being taken B. When cargo loading and discharging has been too rapid C. When the crankcase temperature has changed substantially during the process of taking the readings. D. None of the above 65.The process of depositing zinc on steel surfaces by diffusion coating is known as : A. Sherardising B. Chromising C. Calorising D. Galvanising 66.Copper tubing is used in Refrigerant system because A. It has less internal resistance B. It is cheaper compared to other materials C. It is easier to check leaks in copper based system D. None of the above 67.Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing 68.Freight paid by charterers on a quantity of cargo short-shipped, i.e quantity agreed upon but not loaded by the charterer, is called: A. Pro-rata freight B. Back Freight ... C. Dead freight D. None of the above 69.Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine components A. Increasing the atomization pressure of fuel injectors B. Fitting exhaust valves with valve rotators C. Running engine at or near normal sea load D. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and other as calrifier 70.Centrifugal pumps cannot handle air and require priming.But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:- A. Fluidity only B. Density only C. Both fluidity and density D. Compressibility 71.Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why? A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant 72. You as a fourth engineer have taken over watch from third engineer. He said OWS is running in 0 ppm. But after taking over watch you observed that fresh water flushing valve is crack open. After closing it, suddenly the oil content has exceeded 15ppm. What will you do? a. shut the OWS & inform CEO. b. shut the OWS but no need to inform anyone. c. Don't touch the appratus & inform CEO. d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone. Like • 73. Which of the following V/V cannot be overhauled in place without removing piping? A) BallValve (B) Diaphragm valve C) Globe valve Ans---- (D) Butterfly valve 74. Copper tubing is used in refrigerant system because A) It has less internal resistance B) It is cheaper compared to other materials. ans----C) It is easier to check leaks in copper based system D)None of the above 75.When pressure inside a system falls below that of the vapour pressure of the liquid Cavities r formed, cavities travelling to high pressure region collapses releasing Considerable energy damage the metal surface which is known as ans-------A) Cavitation B) Erosion B) Impingment Corrosion D) Cavitation Erosion 76.While refloating the vessel after dry docking which of the following check should be Carried out ans------A) Sounding of all double bottom tanks B) Checking leakages in the C) Checking leakages D) Checking level of stern tube, header tanks 77. Pump start out motor gets overloaded or trip on overload A) Alignment is wrong B) Gland packing too tight C) Worn out/damaged ball bearing D) Cavitations exists ans----E) All of the above 78. Why should only approved toilet cleaning chemicals be used in A) Unapproved chemicals can lead to corrosion in the system B) unapproved chemicals can lead to toxic conditions in the system leading C) To destruction of protective coatings ans--------D) Unapproved chemicals can kill aerobic bacteria making the plant ineffective Gases produced by use of unapproved chemicals can pose threat to the operators 79. After ofver hauling reciprocal pump the motor connections were wrongly given. Determine outcome when pump is started? ans------A) The direction of flow wl remain unaffected B) the direction of flow wl b reversed C) The pump wl get damaged because the suction valve wl block the reverse flow causing overpressure leading to pump breakdown. D) The pump wl lose suction N there wl b no flow. 80. Pump driven type clutch attached to vacuum pump r commonly used for priming ballast pump n emergency fir pump. What is the factor which clutches the vacuum pump to pump the clutch during start of the pump. A) Low suction pressure acting against the spring loaded clutching piston B) High suction pressure actiong against the spring loaded clutching piston ans-------C) Low discharge pressure acting against the spring loaded clutching piston D) High discharge pressure acting against the spring loaded clutching piston 81.The ballast valve of nthe fore peak tank is located in the duct keel n cannot be opened or shut by remote operatio n. The valves of other tanks can b operated without any trouble which of the foll. wl b the best practice? ans--------A) Valve should b checked locally for trouble shooting without which it is difficult to find the exact problem. B) The actuator must b defective n should b replaced with a new one C) The control circuit is defective n PCB should b replaced. D) Shore assistance wl b reqd. in such cases. 82. U R responsible for daily transfers of engine room bilges . U follow the sequences aft –fwd (P)-fwd(s) bilgewel n u hv never experienced a problem but 5/E started the transfer n first transferred forward (s) bilgewel n without any problem n u join him later u find that bilge pump is not taking suction fr f(p) n aft bilgewel n then u hv checked everything is normal. what is the cause. A) 5th engineer made a mistake by 1st transferring the fwd (s) bilge wel, normal sequence of operation for engine room machinaries should not b disturbed. ans--------B) fwd (s) Bilge wel suction valve is leaking C) Bilge pump suction filter cover gasket is leaking. D) Fwd (s) Bilgewel suction filter cover gasket is leaking. 83. The centrifugal pump r normally A) Positive displacement type ans--------B) Rotodynamic C) Screw type D)Gear type 84. Sludge pump suction pressure is going full vacuum when u start the pump taking water of double bottom tank suction u hv checked the suction filter n found in clean condition. Taking suction fr fuel oil sludge tank does not happen. Causes of the problem. A) Pump is not working efficiently n reqd. overhauling B) F>O> sludge tank suction valve is leaking ans-------C) W.O. tank D.B. tank suction pipeline has a blockage. D) Can ??? say what is the problem but definiterly the pump needs to b opened up for overhaul 85. The difference between the discharges of a centrifugal pump n reci pump the discharge of centrifugal pump is ----------while that if reci is --------- A) Turbulent, Laminar B) Intermittent continuous ans-------C) Continuous pulsating D) Pulaating continuous 86. Which of the foll. is a true statement A) Aluminium wl b subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte. b) Stainless steel wl b subject to preferential corrosion when in electrical continuity with mild steel in presence of an electrolyte. C) Copper wl b subject to preferential corrosion when in electrical continuity with stainlesssteel in presence of an electrolyte d) Aluminium wl b subject to preferential corrosion when in electrical continuity with zinc in presence of an electrolyte. 87. Ballast pump injection filter was cleaned n the pump was lined up it was found that there was some leakage in the suction filter suction. The pump started n the leakage started. During deblasting it was found that the pump could not take ssuction fr one of the double bottoms. The cause could b A) Pump was drawing air fr. ans------B) Pump was drawing air fr suction filter C) One of thepipelines on the suction side of the pump might be leaking D) The filter was not cleaned properly. 88. The most imp. control measure to prevent boiler tube failure is A) Use of proper refractory mtrl. B) Proper maintenance of fuel burning equipment ans--------C) Proper maintenance of boiler water condition D) All of the above 89. When one of the M/E.F.O. heater is not in use then A) The F.O. inlet n outlet valve should b kept shut, but steam heating valves should b kept crack open so as to keep the heater warm. B) F.O. inlet n outlet valve should b kept shut n heating valves also should b completely shut n should b drained of any remaining F.O. c) F.O. inlet n outlet valve should b kept crack open so that the F.O. recirculation can take place. ans-------d) F.O. inlet n outlet valve should b kept shut while outlet valve should be left open so that 90. The gland packing of centrifugal pump should hv A) Not allow any breakage under the suction pressure. B) Should only allow drop by drop continuous leakage under positive suction pressure. C) Should allow considerable leakage 91. Corrosion of mild steel can b effectively prevented by A) Cathodic protection B) Protective coatings C) Addition of suitable alloying elements 92. U hv to dismantle a F.O. heater for cleaning . U hv closed both inlet n outlet valves of the heater, both for F.O. n steam side. What wl U do before u start opening the heater? A) There is nothing more to b done, if u know the valves r holding u can straight away start opening the heater without wasting time. B) Drain the heater till pressure gauge reads zero n then start opening the heater. C) Drain the heater till F.O. stops coming out of the drain n then start opening D) the heater. E) First open the vent valve n allow the heater to depressurize. N then open F) the drain valve to drain the contents of the heater. 93. Sequence of metal in the increasing order of noblety in galvanic series A) Stainless steel , Mild steel, Copper, Zinc B) Copper, Stainless steel, Mild steel, Zinc. ans------C) Zinc, Mild steel, Stainless steel, Copper. D) Zinc, Copper, Stainless steel, Mild steel. 94. During flooding of dry dock foll. items must b verified? A) All sea valves are operational B) All overboard discharge valves r operational C) Stern tube seal r operational ans------D) All above 95. After removing all the bonnets n the securing nuts of a large globe valve it is found that the bonnet is coming out because of the strong adhension of the gasket between the bonnet n the housing. What r u going to do in best practices. any idea dude?????????? ans to cupper tubing is c. is it rigt???? correct if wrong?????? 96. Impingement corrosion is a ans------A. Physical action B. CHEMICAL action C. Physical and chemical action D. None of the above 97. It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause? A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump B. The Fwd. (P) bilge well suction valve might be leaking ans------C. The Fwd. (P) bilge well suction filter cover gasket might be leaking D. The pump needs to be overhauled 98.. Which of the following is NOT a correct point for sampling of system lube oil for on board or shore analysis? A. Standpipes ans-----B. Purifier outlets C. Inlet or outlet of L. O. coolers D. Tank drains 99. The ballast valve of the fore peak tank is located in the duct keel and cannot be opened or shut by remote operation. The valves of other tanks can be operated remotely without any trouble which of the following will be the best practice? ans-----A. Valve should be checked locally for troubleshooting without which it is difficult to find the exact problem B. The actuator must be defective and should be replaced with a new one C. The control circuit is defective and the PCB should be replaced D. Shore assistance will be required in such cases 100. Pump Start But Motor gets overloaded or Trip on overload. ( multiple answer) ans----A. Alignment is wrong ans----B. Gland packing too tight ans-----C. Worn out / Damaged ball bearing D. Cavitation exists 101. The most important control measure to prevent boiler tube failure is: A. Use of proper refractory material B. Proper maintenance of fuel burning equipment ans-------C. Proper maintenance of boiler water condition D. All of the above 102. During flooding of a dry dock the following items must be verified A. All sea valves are operational B. All overboard discharge valves are operational C. Stern tube seal are operational ans-------D. All of the above 103. When running TWO centrifugal Pumps in parallel, Flow rate "Q" is increased. ans-------A. TRUE B. False C. May Be D. I Don't know 104. In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel? A. Spalling B. Cracking C. Shrinkage cracking ans-----D. Slagging 105. Normally so called single screw pumps are used as sludge pumps in engine room. What is the correct technical name of these pumps? A. Snake Pump ans------B. Screw Pump C. Progressive cavity pump D. Gerotor Pump 106. A thin layer of electrolyte trapped in a small pits on a metal surface , and remaining stagnant over a period of time , may cause : A. Erosion B. Bimetallic corrosion ans------C. Crevice corrosion D. Corrosion fatigue 107. The purpose of an evaporator in the domestic refrigeration system is to ans------A. Transmit latent heat of evaporation B. Absorb latent heat of fusion C. Absorb latent heat of evaporation D. Transmit latent heat of fusion 108. In case of tankers, the speed of cargo pumps is reduced while stripping, why? ans-----A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced C. To prevent the pump from over speeding if it loses suction D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo 109. A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing? A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing ans------D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat 110. Which of the following statements is False about cleanliness of electric motors? A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor. C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings. ans------D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them. 111. The attached vacuum pump of a ballast pump operates on the principle of a: A. Centrifugal pump B. Reciprocating pump C. Gear Pump ans------D. Vane Pump 112. Increasing the rotational speed of a cargo pump the pump flow rate will: ans------A. Increase in direct proportion to the increase in speed B. Decrease in direct proportion to the increase in speed C. Flow rate doesn't depend upon speed D. Flow 113. Vacuum priming pumps which work on the principle of fixed vane pumps require _____________ for___________ clearance between vane tips and casing. A. Lube oil, lubricating B. Lube oil, sealing ans------C. Water, sealing D. Gland packing, sealing ans------19. Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over . 114.Which one of the following is a type of corrosion :- A. Electroplating B. Galvanisation ans------C. Graphitisation D. Demulsification 115. The main disadvantages of a reciprocating pump over a Gear pump is that: A. A gear pump is self priming while a reciprocating pump is not B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed C. The discharge of reciprocating pump is pulsating and discharge rate is lesser D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used 116. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will A. increase ans------B. decrease C. Will not be affected as the pump power depends only on the flow capacity D. None of the above 117. A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out? A. The ball and seat can be lapped together B. The ball can be machined while the seat can be replaced ans------C. Normally both the non-metallic seats get worn out and have to be replaced D. Normally ball gets damaged and has to be replaced 118. Surface preparation of steel surfaces, prior carrying out painting isimportant because (choose the best alternative): ans------A. Any rust and contaminant inclusions may cause local paint film breakdown B. Too much paint will be consumed if surface preparation is not carried out C. Surface will be very rough if proper surface preparation is not carried out D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes strong bonding 119. Air compressor cooler tube type A) Spring type B) Floating type C) Fixed tube ans------D) U tube — 120. Impingement corrosion is a A. Physical action B. CHEMICAL action C. Physical and chemical action D. None of the above 121. It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause? A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump B. The Fwd. (P) bilge well suction valve might be leaking C. The Fwd. (P) bilge well suction filter cover gasket might be leaking D. The pump needs to be overhauled 122. Which of the following is NOT a correct point for sampling of system lube oil for on board or shore analysis? A. Standpipes B. Purifier outlets C. Inlet or outlet of L. O. coolers D. Tank drains 123. The ballast valve of the fore peak tank is located in the duct keel and cannot be opened or shut by remote operation. The valves of other tanks can be operated remotely without any trouble which of the following will be the best practice? A. Valve should be checked locally for troubleshooting without which it is difficult to find the exact problem B. The actuator must be defective and should be replaced with a new one C. The control circuit is defective and the PCB should be replaced D. Shore assistance will be required in such cases 124. Pump Start But Motor gets overloaded or Trip on overload. ( multiple answer) A. Alignment is wrong B. Gland packing too tight C. Worn out / Damaged ball bearing D. Cavitation exists 125. The most important control measure to prevent boiler tube failure is: A. Use of proper refractory material B. Proper maintenance of fuel burning equipment C. Proper maintenance of boiler water condition D. All of the above 126. During flooding of a dry dock the following items must be verified A. All sea valves are operational B. All overboard discharge valves are operational C. Stern tube seal are operational D. All of the above 127. When running TWO centrifugal Pumps in parallel, Flow rate "Q" is increased. A. TRUE B. False C. May Be D. I Don't know 128. In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel? A. Spalling B. Cracking C. Shrinkage cracking D. Slagging 129. Normally so called single screw pumps are used as sludge pumps in engine room. What is the correct technical name of these pumps? A. Snake Pump B. Screw Pump C. Progressive cavity pump D. Gerotor Pump 130. A thin layer of electrolyte trapped in a small pits on a metal surface , and remaining stagnant over a period of time , may cause : A. Erosion B. Bimetallic corrosion C. Crevice corrosion D. Corrosion fatigue 131. The purpose of an evaporator in the domestic refrigeration system is to A. Transmit latent heat of evaporation B. Absorb latent heat of fusion C. Absorb latent heat of evaporation D. Transmit latent heat of fusion 132. In case of tankers, the speed of cargo pumps is reduced while stripping, why? A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced C. To prevent the pump from over speeding if it loses suction D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo 133. A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing? A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat 134. Which of the following statements is False about cleanliness of electric motors? A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor. C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings. D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them. 135. The attached vacuum pump of a ballast pump operates on the principle of a: A. Centrifugal pump B. Reciprocating pump C. Gear Pump D. Vane Pump 136. Increasing the rotational speed of a cargo pump the pump flow rate will: A. Increase in direct proportion to the increase in speed B. Decrease in direct proportion to the increase in speed C. Flow rate doesn't depend upon speed D. Flow 137. Vacuum priming pumps which work on the principle of fixed vane pumps require _____________ for___________ clearance between vane tips and casing. A. Lube oil, lubricating B. Lube oil, sealing C. Water, sealing D. Gland packing, sealing 138. Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing 139. Which one of the following is a type of corrosion :- A. Electroplating B. Galvanisation C. Graphitisation D. Demulsification 140. The main disadvantages of a reciprocating pump over a Gear pump is that: A. A gear pump is self priming while a reciprocating pump is not B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed C. The discharge of reciprocating pump is pulsating and discharge rate is lesser D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used 141. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will A. increase B. decrease C. Will not be affected as the pump power depends only on the flow capacity D. None of the above 142. A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out? A. The ball and seat can be lapped together B. The ball can be machined while the seat can be replaced C. Normally both the non-metallic seats get worn out and have to be replaced D. Normally ball gets damaged and has to be replaced 143. Surface preparation of steel surfaces, prior carrying out painting isimportant because (choose the best alternative): A. Any rust and contaminant inclusions may cause local paint film breakdown B. Too much paint will be consumed if surface preparation is not carried out C. Surface will be very rough if proper surface preparation is not carried out D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes strong bonding 144. Air compressor cooler tube type A) Spring type B) Floating type C) Fixed tube D) U tube — in

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Saturday 12 January 2013

Online mep question 1

Motor question

1) Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to a)react with insufficient speed droop b)fail to react to small speed changes c)have excessive sensitivity to small speed changes d)remain in the neutral position 2) A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the a)pilot valve opening b)compensating needle valve c)compensating spring tension d)accumulator spring tension 3) Friction, engine wear, and oil consumption in a diesel engine are directly related to the a)acidity of the oil b)pour point of the oilc)flash point of the oil d)viscosity of the oil 4) When the prime movers of two paralleled generators, equipped with mechanical-hydraulic governors, are operating within their designed range, the unit with the least amount of speed drop will -a)pick up more of any increase in load b)pick up less of any increase in load c)share an equal amount of any increase in load d)drop an equal amount of any decrease in load 5) Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished a)during the valve overlap period b)with only the exhaust valve open c)at a pressure below atmospheric d)without cooling the cylinders or pistons 6) Trunk-type diesel engine pistons are most effectively cooled by heat a)conducted through the engine block b)conducted to water cooled cylinder walls c)conducted through the piston crown d)losses to escaping exhaust gasses 7) Fuel oil is injected into the cylinder of a four-stroke/cycle diesel engine during the a)intake stroke b)exhaust stroke c)power stroke d)compression stroke 8) A large, low-speed, main propulsion diesel engine uses sea water to directly cool the a)cylinder heads b)exhaust valves c)scavenging air d)injectors 9) The total starting air capacity required for reversible main engines is to be sufficient for a least -a)six consecutive starts b)eight consecutive starts c)ten consecutive starts d)twelve consecutive starts 10) The light and medium fuels utilized in internal combustion engines provide a source of a)lubrication for pistons and rings b)food for microbiological organisms c)gases most detrimental to the ozone layer of the atmosphere d)all of the above 11) Which bearing half will receive the greatest load in a two-stroke/cycle diesel engine? a)Lower half of the connecting rod bearing at the crankshaft end of the rodb)Upper half of the main bearing c)Lower half of the piston pin bearing in the connecting rod d)All bearing halves share an equal load 12) Maximum lube system operating pressure for a diesel engine is normally regulated by a/an a)orifice in the pump suction b)special filter design c)pressure drop through the filterd)relief valve 13) A naturally aspirated diesel engine at full throttle will have an intake manifold pressure a)slightly less than atmospheric pressureb)approximately equal to exhaust manifold pressure at all times c)that is widely fluctuatingd)constantly decreasing as engine load increases 14) The output pressure of a diesel engine lube oil pump is regulated by a/an a)relief valve b)metering valvec)variable speed pump drive d)orifice in the lube oil header 15) An increase in the air inlet manifold pressure of a diesel engine will result in a/an a)decrease in maximum cylinder pressure b)increase in ignition lag c)decrease in fuel consumption per horsepower-hour d)decrease in exhaust manifold pressure 16) Maximum lube oil system pressure is normally controlled by a)the capacity of the lube oil pump b)the speed of the lube oil pump c)the outlet pressure of the lube oil pump d)a relief valve 17) Which of the following statements is true concerning an oil cooler? a)The oil temperature is less than the cooling water temperature b)The oil pressure is less than the cooling water pressurec)The oil pressure is greater than the cooling water pressure d)The magnets are installed to remove metal particles 18) The highest pressure in any closed diesel engine freshwater cooling system is at the -a)jacket water outlet b)expansion tank inlet c)heat exchanger inlet d)cooling water pump outlet 19) Concerning diesel propelled vessels, the astern power is to provide for continiuos operation astern -a)equal to that available for ahead operation b)at 70 percent of the ahead rpm at rated speed c)while underway and under all normal conditionsd)at 70 percent of the ahead rpm of average continious sea speed 20) Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the a)air charge density becoming too high b)piston crown surfaces becoming too cold c)formation of excessive quantities of condensate d)compression pressure being greatly reduced 21) The nuts of main bearings, connecting rod bolts and all other moving parts are to be secured by a)hardened steel nut locks b)cotter pins made of spring steel c)split pins or other effective means d)hydraulic nuts as commonly found on large low speed engines 22) If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will a)open late and close early b)open late and close late c)fail to open when the engine is cold d)fail to open at normal operating temperature 23) Proper lubrication of the main bearings is more easily obtained in a single acting four-stroke/cycle diesel engine than a single acting two-stroke/cycle diesel engine because a)bearing pressure in a four-stroke/cycle single acting diesel engine is continually reversed b)bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed c)the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine d)two-stroke/cycle diesel engines require more complicated lubrication piping 24) Increasing the valve clearance between a valve stem and rocker arm, will result in the valve a)closing later b)opening sooner c)staying open for a shorter period of time d)staying open for a longer period of time 25) Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle, turbocharged, diesel engine? a)Clogged air intake filters b)Piston blow-by c)A defective after cooler d)Faulty exhaust valves 26) Cooling the intake air supplied to a diesel engine will a)reduce mean effective pressure b)decrease average compression pressure c)decrease air charge density d)increase power output 27) Which of the following condition may need to be reduced when operating a large, low-speed, main propulsion, diesel engine at low loads?-a)Injection pressures b)Control air supply pressure c)Cooling water flow through after coolers d)Lube oil temperature 28) One function of the fuel pump delivery check valve is to a)prevent carbon deposits from forming on the injector nozzle b)help the injector needle reseat without dribbling at the nozzle holes c)provide a prolonged pressure drop in the high pressure steel piping to the injector d)ensure a fuel leakoff between the plunger and barrel which provides lubrication for relative movement 29) A closed freshwater cooling system is commonly used with marine diesel engines because the -a)need for water treatment is eliminated b)cooling water temperature differential is greater c)cooling water pumps are directly reversible d)jacket water temperature is more easily controlled 30) Fuel droplets injected into a diesel engine cylinder must have adequate penetration to a)prolong the ignition delay periodb)ensure the beginning of fuel injection c)thoroughly utilize the air charged)allow controlled fuel combustion 31) The valve cam slope angle determines the -a)engine torque characteristics b)acceleration rate of valve opening and closingc)engine fuel efficiency d)diameter of intake and exhaust valves 32) The rate of fuel injection in a diesel engine cylinder depends primarily on a)the size of the holes in the fuel nozzle b)timing of the pump c)supply pressure to the pump d)shape of the combustion chamber 33) Which of the following devices is normally provided to prevent oil starvation in a diesel lubrication system utilizing the "full flow" principle? a)Duplex strainer b)Three-way valve c)Pressure relief bypass line around the filter d)Mechanical straining filter 34) A port-and-helix fuel injection pump having upper and lower plunger helixes is designed to a)vary fuel delivery and return pressure b)vary the beginning and ending of injection c)operate with residual fuels only d)provide maximum fuel delivery rate 35) One advantage of hydraulic clutches over mechanical clutches in diesel engine installations is -a)the power is transmitted at very high efficiency of 60% b)the torsional vibrations are transmitted directly to the reduction gears c)each clutch has a separate oil gland for reverse operation d)no mechanical connection exists between the driving and driven elements 36) An individual injection pump is designed for variable beginning and constant ending of injection. For diesel engines operating at constant speeds, the start of injection will a)advance as the load increases b)retard as the load increases c)remain unchanged regardless of load d)always occur at top dead center 37) The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed a)metering b)timing c)rate of injection d)rate of distribution 38) In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the -a)metal particles loosened by wear b)air when no air cleaners are used c)condensation of water wapors d)breakdown of the lubricating oil itself 39) On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridge indicates -a)piston ring blow-by b)dirty air filter c)excessive oil pressure d)excessive oil temperature 40) When the lower edge of the spiral begins to uncover the release port in a jerk pump, the a)pumping continues until the plunger travels its full stroke b)effective pumping stroke of the plunger ends c)pres. drops slowly until the full stroke is attained d)plunger rotates to the zero delivery position until next stroke 41) Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling water temperature from all cylinders begins to rise above normal, you should suspect -a)increased blow-by in all cylinders b)incomplete combustion in all cylinders c)overloading in all cylinders d)insufficient fuel delivery to all cylinders 42) Proper operation of the main engine reduction gear set requires the operator to monitor a)the sump oil level b)oil flow sight glasses c)bearing temperatures d)all of the above 43) The duration of fuel injection developed by an individual port-and-helix fuel injection pump, is determined by the -a)total pump stroke b)pump plunger diameterc)plunger helix angle d)effective pump stroke 44) Before starting a diesel engine using an attached lube oil pump, the engineer should a)open the bypass line b)cut in the lube oil coolerc)pressurize the lube oil system d)top off the expansion tank 45) A diesel engine using lube oil with too high a viscosity will exhibit a)increased starting difficulty in cold weather b)increased oil consumption c)thickening at higher operating temperatures d)minimal friction losses 46) If the main propulsion diesel engine governor works irregularly with a jerking motion, a possible cause can be-a)a sticking fuel control linkage b)a malfunctioning overload camc)an unlocked overspeed trip d)floating valves 47) During extremely cold weather, while starting an engine, it turns too slowly and fails to start. This problem is most likely the result of a)high fuel oil viscosity b)low fuel oil temperature c)high lube oil viscosity d)energized glow plugs 48) Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed temperatures can -a)increase power output b)decrease lube oil viscosity c)eliminate fuel knock d)cause sulfuric acid formation 49) Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?-a)Sensitivity b)Power c)Speed droop d)Compensation 50) An emergency diesel generator cooling system is equipped with an automotive type thermostat. If the thermostat bellows loses its charge, the thermostat will a)open, and the coolant temperature will increase b)open, and the coolant temperature will decrease c)close, and the engine coolant temperature will increase d)close, and the coolant temperature will decrease 51) Fuel oil penetration into the cylinder of a diesel engine is a)dependent on air turbulence b)reduced by finer atomization c)increased by finer atomization d)non-existent in the precombustion chamber system 52) Precombustion chambers, air cells, and energy cells in high-speed, small bore diesel engines all serve to increase-a)firing pressure b)ignition quality of fuelc)fuel-air ratio during compression d)turbulence 53). Which of the following statements best describes the operational characteristics of an isochronous governors?-a)they are suitable for use on main propulsion units b)they strive to maintain a constant engine speed for all values of steady load c)they cause a proportional drop in engine speed as the load is increased d)they have poor sensitivity at high RPM. 54). Theoretical perfect combustion in a diesel engine yields by-products of a)aldehydes and carbon dioxide b)water vapour and carbon monoxide c)nitrogen and carbon monoxide d)water vapour and carbon dioxide 55) Combustion knock can occur in the cylinders of a diesel engine under any condition permitting-a)a shortened ignition delay period b)a lean fuel/air mixture c)excess fuel in the combustion chamber d)rapid vaporisation of injected fuel droplets 56) When exessive fuel dilution is noted in the lube oil, the oil should be- a)centrifuged b)filtered c)strained d)changed 57) Sticking of diesel engine piston compression rings may be caused by- a)high compression pressure b)excessive ring action c)excessive cylinder lubrication d)improper ring rotation 58) When fuel is injected late into a diesel engine cylinder, a)the exhaust will be clear b)fuel consumption will be low c)all the fuel will be burned at top dead center d)fuel consumption will be high 59) ME LO inlet temperature should be— a)40C b)50C c)60C d)55C 60)Exhaust temp of one ME cylinder high could mean a)fuel valves need overhaul b)exh valve leakage c)piston ring blow past d)all of above 61)For a 2 stroke engine with exhaust ports— a)scavenge ports close before exhaust ports b)exhaust ports close before scavenge ports c)scavenge ports and exhaust ports close at same time before BDC d)scavenge ports and exhaust ports close at same time after BDC 62)For a 2 stroke engine with exhaust valves— a)scavenge valve closes before exhaust ports b)exhaust valves close before scavenge valves c)scavenge and exhaust valves close at same time before BDC d)scavenge and exhaust valves close at same time after BDC 63)The maximum amount of liner wear occurs at— a)top of liner b)1/ 3 downward from top centre c)midway d)bottom of liner 64)Which of the following cannot be removed from fuel oil by centrifuging in the purifier and micro-filtration a)sodium b)aluminium and silicon c)vanadium d)ash 65)In the preheater before purifier the recommended heavy oil preheat is- a)85C b)98C c)110C d)120c 66)For a ME which has a 5 micron fuel filter, a homogenizer ( omega fire ) is usually fitted – a)before the purifier b)after the purifier c)after the 5 micron filter to ME d)before the horizontal clarifier 67)For a main engine fuel system which has a 5 micron filter ,a super decanter is usually fitted--a)before the purifier b)after the purifier c)after the 5 micron filter to ME d)before the horizontal clarifier 68)For low sulphur 380 cst fuels the TBN of MECC oil should be in the region of—a)20 b)40 c)60 d)70 69)Using a MECC oil of high BN can cause— a)improper centrifuging of water b)Calcium laquer deposits on bearings c)sludge formation with water in ME sump d)all of above 70)When using a high BN MECYL oil and suddenly the ship has to use low sulphur 380 cst HO in the ME, due to SECA area entry-- a)reduce the feed of MECYL b)increase the feed of MECYL c)do not change the feed rate d)increase the BN of the MECYL 71)ME scavenge air temperature is adjusted by-a)controlling the sea water inlet b)controlling the sea water outlet c)keeping outlet valve 100% open always. d)none of above 72)The ME jacket FW cooling outlet temperature is- a)80C b)95C c)50C d)55C 73)The scavenge air high temperature set point for 2 stroke ME is a)40C b)55C c)65C d)35C 74)You see white smoke coming from the ME funnel stack, this could be a)one or more cylinders not getting enough fuel b)too low compression pressure c)water in fuel d)all of above 75)The crank angles of a 2 stroke engine are— a)2 cylinder engine/ 90 degrees b)4 cylinder engine/ 60 degrees c)6 cylinder engine/ 90 degrees d)4 cylinder engine/ 90 degrees 76)Crankcase explosions of main engines can be due to- a)over heating of MECC oil b)poor condition of liners/ ringsc)crankshaft / thrust bearing failure d) all of above 77)If there is air in the fuel oil filter, the compression and reexpansion of air will— a)not allow the fuel injection valve to close b)not allow the fuel injection valve to open c)makes no difference d)none of the above 78) Which of the bearings listed are most widely used for the main and connected rod bearings of a diesel engine? a)roller b)sleeve c)precision insert d)needle 79) Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine? a)splash lubrication b)pressure lubrication c)sight feed lubricators d)mechanical lubricators 80) In a naturally aspirated diesel engine, the volume of air intake is directly related to engine a)compression ratio b)valve sizec)fuel pressure d)cylinder clearance volume 81) In a bypass filtering system for a medium or high speed diesel engine, the lube oil bypassing the filter a)returns directly to the suction side of the pumpb)returns directly to the sump c)flows to the engine bearings d)flows through a second-stage strainer, reheater, and returns to the sump 82) In a diesel engine, the main bearings are used between the a)connecting rod and the crankshaft b)wrist pin and the connecting rod c)camshaft and the engine block d)crankshaft and the engine block 83) Heat exchangers are most commonly found in a small auxiliary diesel engine a)fuel oil system b)governing system c)air starting system d)lube oil system 84) Multiple concentric valve springs are often used with diesel engine valves to a)enable research and development of cam contour to be simplified b)operate the valve gear where the larger force is required, but space limitations restrict use of a large spring c)allow for easier valve replacement d)enable a total smaller valve spring force to keep the valve tight on its seat 85) Which of the listed bearing installations is subjected to swinging motion? a)crankshaft journal b)crankpin bearings c)wrist pin bearings d)thrust bearings 86) One advantage of vacuum feed type cylinder lubricators over the liquid sight type is-a)there are fewer moving parts b)adjustment is not required c)better metering accuracy d)a lower grade of oil may be used 87) Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type -pump with a concentric housing to a)provide cooling water flow when the engine is running either ahead or asterb)provide the greatest pump efficiency c)prevent pump clogging from marine growth d)prevent cavitation at the pump outlet 88) Motor vessels usually have an independent lube oil system each for the main engine and main reduction gears because a)coolers are not needed for the gear system b)contaminants produced by the engine could harm the reduction gears c)non additive oils are used in the main engine system d)different type centrifuges are required for the main engine and reduction gear lube systems 89) Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines?a)Steel-lined b)Poured babbitt, self-aligning c)Split roller d)Precision insert 90) Directional intake ports in diesel engines are used to a)reduce air charge turbulence b)induce air swirl c)deflect hot combustion gas away from the valves d)oppose the effects of piston induced squish 91) Diesel engine main and connecting rod precision bearings are made in halves. Each half exceeds one-half the bearing circumference by a small amount. The small amount is termed a)clearance b)crush c)pitch d)thrust 92) The piston rod scraper box incorporated in a single acting two-stroke/cycle, crosshead diesel engine serves to a)eliminate the necessity for an oil scraper ring b)prevent side thrust and cylinder scoring c)prevent sludge and dirty oil from entering the crankcase d)scrape oil and carbon deposits off the cylinder walls 93) The proper location for journal bearing oil grooves is a)in the region of the load bearing surfaceb)as a side relief where the two shells meet c)at the bottom of the bearingd)halfway between bottom and where shells meet 94) How are hydraulic valve lash adjusters on diesel engine rocker arm assemblies lubricated? a)Cup-fed grease b)Sealed self-lubricatorsc)Metered hydraulic oil supply d)Forced lube oil supply 95) Main propulsion diesel engines having a bore exceeding 300 mm are to have at least a)two independent means of starting the engine b)five air starting valves to permit the admission of starting air at any crank angle c)one (explosion relief) valve at the position of each main crank throw d)two engine driven lube oil pumps capable of parallel operation 96) Integral water jacket liners use O-rings near the bottom of the liner, these O-rings serve to a)form a water seal between the liner and engine block b)allow for slight misalignment of the liner c)prevent the escape of lubricating oil from the crankcase d)ensure proper temperature flow between the liner and engine block 97) Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent a)excessive crankcase pressure b)excessive lube oil temperature c)contamination of the lube oil by water d)contamination of the cooling water by lube oil 98) A characteristic of a bearing material which permits small dirt particles to become embedded in the surface &is a)desirable, as it will prevent damage to the journal surfaceb)desirable, as it will assist in keeping the lube oil filters cleanc)undesirable, since the embedded particles will score the journad d)undesirable, since the particles will interfere with lube oil flow 99) Most fuel injection nozzles are opened by a)fuel oil pressure b)a cam operated follower c)a spring-loaded pressure plate d)timing gears keyed to the crankshaft 100) Which of the following devices controls the discharge flow rate of an attached, positive displacement, rotary gear, diesel engine, lube oil pump? a)A pressure regulating valve b)A pressure relief valvec)The engine speed d)An orifice 101) The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and a)reduce water temperature b)reduce water turbulence c)provide an air cushion d)allow for an increase in water volume as the engine warms up 102) To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of a)brass b)copper c)iron d)monel metal or stainless steel 103) Which of the following statements describes the function of an expansion tank in a diesel engine cooling system? a)Maintains a constant head on the system b)Reduces the air cock when fires are lighted c)Provides a low pressure point for the addition of makeup cooling water d)All of the above 104) On a large diesel engine installation, crankshaft axial alignment is maintained by the a)piston rod guides b)engine thrust bearing c)crosshead bearing d)main shaft flexible coupling 105) Scavenging in a four-stroke/cycle diesel engine occurs during the a)last part of the exhaust stroke, and the first part of the intake stroke b)last part of the intake stroke only c)early part of the injection stroke only d)early part of the power stroke 106) In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running? a)Bed plate b)Column c)Entablature d)Tie rod 107) The lube oil cooler is located after the lube oil filter in order for a)the filter to operate more efficiently b)the lube oil cooler to be bypassed c)positive lube oil pump suction to be assured d)galvanic action in the cooler to be minimized 108) In two-stroke/cycle diesel engine, the process of scavenging begins as the a)piston nears and passes TDC b)early part of the upstroke c)piston passes BDC d)early part of the downstroke 109 W res. to flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to a)allow filtration of less viscous oil b)decrease the pressure drop across the filter c)improve overall filtration d)all of the above 110) Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the a)main bearings b)connecting rod bearingsc)piston pin bushings d)All of the above 111) The outlet from an expansion tank of a closed freshwater cooling system should be piped to the-a)cylinder head water outlet header b)cylinder jacket inlet main c)heat exchanger inlet connection d)jacket water pump suction line 112) The intake valves in diesel engine are reseated by a)cam followers b)push rods c)combustion gases d)valve springs 113) Small amounts of moisture are necessary to trigger the growth of microbiological organisms found in some marine fuels. Some sources of water contamination are a)tank surface leakage b)humidity and condensation c)improper tank washing procedures d)All of the above 114) The main function of tie rods in the construction of large, low speed diesel engines is to a)stiffen the bedplate in way of the main bearings to increase the engine`s longitudinal strength b)accept most of the tensile loading that results from the firing forces developed during operation c)mount the engine frame securely to the hull to prevent shaft coupling misalignment d)connect the crosshead solidly to the piston rod 115) On most modern diesel engines,the main and connecting rod bearings receive their lubricating oil by -a)banjo feed b)splash feed c)gravity feed d)pressure feed 116) A unit type fuel injector is used on a diesel engine to a)meter the fuel b)produce the proper fuel oil pressure c)atomize the fuel d)all of the above 117) Lubricating system for diesel engines are usually designed to initially provide lube oil to the engine-a)camshaft bearings b)main bearings c)piston crowns d)cylinder walls 118) Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are-a)operated manually once each hour b)operated until the engine has started c)placed into operation only at maximum load d)adjustable to meet lubrication requirements 119) Shacker, circulation, and spray are the three general methods used in a)pre-injection fuel oil treatment b)lube oil filtrationc)fuel oil purification d)piston cooling 120) Fuel injector nozzles are usually of the multi-orifice type with the number and placement of the holes arranged according to thea)type of piston rings b)pressure of the fuel system c)size of the pump plunger spring d)design of the combustion chamber 121) What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?a)45° b)60° c)90° d)100° 122) The main reason counterweights are added to crankshafts is to a)reduce piston side thrus b)reduce crankshaft end thrust c)provide uniform loading and wear of main bearings d)increase the strength of the crank webs 123) A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional vibrations in the a)camshaft b)flywheel c)crankshaft d)thrust shaft 124) A crankshaft whose center of gravity coincides with its center line is said to be a)dynamically balanced b)statically balanced c)counter balanced d)resonantly balanced 125) The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of a)an isochronous governor b)elastic engine mounts c)a vibration damper d)a cast iron bed plate with good flexible qualities 126). In a diesel engine lube oil system, which of the following parts should be lubricated first? a)Camshaft bearings b)Main bearings c)Piston crowns d)Cylinder walls 127) When fuel oil heaters are required for engine operation, a)each heater shall have the capacity to supply the main engine at full power b)at least two heaters of approximately equal size are to be installed c)the system shall be designed to permit series or parallel operation d)none of the above 128) An advantage of aluminium pistons compared to cast iron pistons is: a)greater high temperature strength b)better heat conductivity c)greater weight per cubic cm d)increased resistance to wear 129) Which engine component increases air density and helps to improve engine operating efficiency?- a)impeller b)compressor c)aftercooler d)exhaust diffuser 130) An electric heater built into the cylinder water jacket would be used to a)raise lube oil viscosity for easier starting in cold weather b)increase air inlet temperature c)increase compression ratio d)increase water temperature for easier starting in cold weather 131) Which is found with both mechanical and hydraulic governors? a)direct linkage between the ball head and fuel rack b)a servomotor c)a compensating device d)flyweights 132) Which of the following design features will reduce the possibility of overheating the top compression rings of a cast iron piston? a)The top ring is located as close to the piston as possible b)The inside surface of the piston head is rounded into the ring belt c)A nickel-bearing insert is cast into the top ring groove d)A heat dam design is sometimes used in the piston head 133) The purpose of heat dam used in some diesel engine cast iron pistons is to a)concentrate all heat in the piston crown b)increase the distance of travel for heat from the crown to the top ring groove c)ensure that all heat in the piston crowns is conducted to the top ring d)provide a short direct path for heat to flow from the crown to the top ring 134) Valves used in diesel engine fuel oil pressure piping are to be a)installed to close against flowb)solenoid released upon the failure of engine lubrication c)either of the gate or globe valve type d)forge constructed under the approval of the Marine Inspector 135). Cast iron pistons used in large propulsion engines are constructed with a)no taper whatsoever b)the skirt being tapered and smaller than the crown c)the skirt being tapered and larger than the crown d)the crown being tapered and smaller than the skirt 136) The diameter of a piston is usually less at the crown than at the skirt, in order to a)facilitate the installation of piston ringsb)allow for the expansion of the piston during operation c)prevent crankcase vapors from entering the combustion chamberd)reduce wearing of the upper cylinder liner 137). Which of the following manufacturing methods is recommended for diesel engine fuel injection line piping?-a)Cold rolledb)Electric resistance weldedc)Seamless drawnd)Straight seam 138) Exhaust pipes of multiple engine installations are not to be interconnected, but are to be run separately to the atmospherea)unless arranged to prevent the return of gases to an idle engine b)to a point not lower than the highest load linec)at a location segregated from other ventilation systems d)and shall be protected by a rain guard or similar device 139) Which of the bearing types listed is most commonly used in smaller vessel main propulsion reduction gears as thrust bearings?a)ball bearings b)poured bearings c)sleeved bearings d)tapered roller bearings 140) The main reason for using bimetallic piston rings is to a)increase engine thermal efficiency b)reduce specific fuel consumption c)reduce the probability of ring fracture d)allow for ring expansion 141) A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in c)compensation needle valve clearance d)centrifugal force on the flyweights 142) The reason why the pneumatic reversible roller guide of fuel pump could oscillate is a)incorrect clearance in the air cylinder guideway/ reverse arm bushing b)too large air pressure drop c)insufficient air supply d)all of above 143) Reasons for exhaust valve hammering could be- a)deficiency in oil supplyb)errors in air spring c)excessive leakage in the HP oil system d)all of above 144) error in the air spring system causing exhaust valve hammer can be due to— a)air pressure too high b)maladjusted safety/ drain valve c)supply pressure not corresponding with safety valve opening pressure d)all of above 145)deficiency in oil supply causing exhaust valve hammering can be due to- a)foaming oil due to air leak at pump suction b)too low oil supply pressure c)too high oil temperature (MECC ) causing low viscocity d)all of above 146) excessive difference between combustion pressure and compression pressure in a ME cylinder can be due to-a)low scavenge air pressure b)change in exhaust valve timing c)burnt exhaust valves d)all of above 147)the difference between water washing and dry cleaning the TC turbine is a)there is no difference one is wet, the other is dry b)wet washing requires reduced load c)dry cleaning requires reduced load d)none of the above 148) oscillations of pneumatic reversible roller guide for fuel pump can cause- a)mechanical damage to air cylinder b)leakages on manoevering air c)loss of engine manoeveribility d)all of above 149) During manoevering the MECYL feed rate is usually a)125% of service feed rate b)50% c)200% d)300% 150)The difference between the max combustion pressure and compression pressure in a 2 stroke engine cylinder unit isa)40 barsb)10 barsc)70 barsd)65 bars 151) The air spring pressure to prevent ME exhaust valve hammer is in the region of— a)2 kgb)7kgc)12 kgd)14 kg 152.Your indicator diagram from one of the main engine cylinders is shown. P Comp normal, P Max is low--What kind of steps do you think is necessary to rectify the failure? A Check fuel injector valve, fuel injection timing, fuel pump suction valve and fuel pump lead B Clean air cooler and turbocharger air cooler C Adjust fuel pump lead only during operation D Increase fuel pump setting. 153.Your indicator diagram is as shown. What kind of steps do you think are necessary to rectify the failure? Pc normal pm highA Check if fuel injection is too early or fuel pump lead too large B Check if fuel injection valve is correctly by adjusted. C Check that you have correctly viscosity/fuel preheating.D Replace the fuel valve. 154.A drawn indicator diagram from one of the main engine cylinders is as shown. What kind of steps are necessary to rectify the failure?—pc and pm both low A Overhaul the unit to determine faults such as: piston ring blow-by, exhaust valve malfunction, clogged scavenging ports, delayed ignition etc.B Adjust fuel pump lead to inject more fuel so as to maintain power balance C Change fuel injection valve D Check fuel pump safety valve. 155.During inspection of piston and liners through scavenging ports, piston rings on all units were found as shown (micro seizure). The best way to stop its progress is: A Increase cylinder oil consumption, determine fuel quality and readjust the fuel oil purifiers B Increase cylinder oil consumption C Replace all piston rings D Run engine at lower load. 156.During inspection and calibration of one unit, you observe the situation shown. The conclusion is clover leafing. The main engine uses high grade TBN cylinder oil. What do you have to do in order to reduce wear?—depression on either side of all lub orifices—like 10 paise coin A Decrease jacket cooling water temperature to avoid heat stress B Increase the jacket cooling water temperature to avoid the sulphur dew point C Increase cylinder oil consumption to neutralize the sulphur D Contact engine maker for advice. 157.Your vessel is entering a tropical area and high humidity is expected. To avoid condensation in the main engine's air cooler, it is recommended to: A Operate the engine with slightly open drain cocks, scavenging to get rid of the water B Reduce speed. C Decrease the air temperature so proper draining can be achieved from the air cooler D Increase scavenging air temperature to above dew point 158.During inspection of the crank bearing for one of the units in the main engine, the bearing shell was found as follows: Surface of the white metal was black and very hard. Patches of black incrustations have worn grooves in the journal. What was the cause? A Dirt in the lubricating oil B Wrong casting of bearing shell C Water in the lubricating oil during service D Bearing shell service time exceeded. 159.When carrying out piston overhaul, it is important to clean the ring grooves properly. Why? A To make sure gas pressure can enter freely on top of and behind the piston ring B To make the rings fit in the grooveC All rings must be changed to maintain a perfect sealing D That piston rings can move freely in the grooves. 160.During operation of the main engine, the exhaust temperature increases on one of the cylinders. The turbocharger starts surging and smoke from the turbocharger inlet air filter occurs. What is the probable cause? A High back pressure in the exhaust system B) Turbocharger failure C Fuel valve stick in open position. D Scavenge box fire 161.You are having a blow-by on the main engine, but due to the circumstances, it is impossible to stop and do a piston overhaul. What is the correct action to take? A Reduce speed. B No action necessary. C Reduce speed temporarily and increase cylinder oil consumption. D Increase cylinder oil consumption. 162.You have installed a new bearing in the main engine. What is the necessary action to take in the running-in period? A Stop after 30 min. running to hand feel the bearing. B Allowance must be made for a running-in period with reduced speed and careful temperature monitoring. C No necessary steps to be taken. D Allow for 1 hr. running with appropriate temperature monitoring of the bearing. 163.You are experiencing large hunting on the fresh water cooling system. What is the reason? A The fresh water circulating pump is worn out. B The cooling water temperature is too low. C You have a cracked liner, or cover. D The expansion tank is empty. 164.Why is it important to check the timing on the cylinder oil lubricators? A To avoid high temperature in the combustion chamber. B To get the right amount of oil into the cylinder. C To get the oil into the cylinder when the piston is in the right position D To avoid excess lubrication. 165.Why do we use cylinder oil? A To neutralize the sulphur and get a lubricating oil film between piston rings and liner. B To get a lubricating oil film between piston rings and liner. C To neutralize the sulphur in the fuel. D To avoid blowby. 166.How large a deviation in opening pressure can be accepted in a diesel engine injection valve? A 15 kg/cm2 B 40 kg C 50 kg D 70 kg 167.What will the effect be, if you have a fuel injector valve that is dripping after the injection is finished ? A Less carbonizing. B Damage to piston and liner. C Greater output of the engine. D Better combustion. 168.How is the quantity of fuel oil, in HP fuel oil pump adjusted when the engine is running ? A By adjustment of the pressure valve in the pump.B By adjusting the length of the pump stroke. C Turning the plunger piston according to engine load D Adjusting oil flow to the HP fuel oil pump. 169.When a changeover from HFO to diesel oil is going to take place, we want this to be carried out as follows -A as fast as possible to save HFO. B as fast as possible to save steam. C as quick as possible, to obtain a fast temperature reduction to cool the HP fuelpumps. D slow to get slow cooling. 170.If you are going to enter the engines crankcase (go inside), how will you secure the engine after you have closed the main starting air valve ? A Engage the turning gear on the engine. B Close absolutely all valves on the starting air bottle. C Close the instrument air supply.D Keep a man posted in the control room to watch that nobody tries to start the engine 171.If you get a heavy scavenging air fire, which one of the following part is likely to take the most serious damage ?A Stuffing box.B Exhaust valve. C Piston. D Crosshead bearing. 172.Why are we blowing the engine before start (slow turning on air) ? A To be sure that we do not have water collected in the cylinders. B To be sure that no parts are loose, or that the engine is blocked from rotation. C To get fresh air into cylinders ensuring a safe start of the engine. D To be sure that all indicator cocks are closed, and no passage into the combustion chamber. 173.The cylinder oil for FO with high sulphur content is supposed to be: A acidic. B Alkaline C neutral.D does not matter. 174.A 2 stroke engine is usually equipped with an auxiliary blower fan, which is supposed to be used:-A continuously, together with the turbochargers to ensure enough air to the engine during full speed running. B during continuously reduced speed under a longer sea voyage. C during manoeuvre and manoeuvre speed condition (arrival and departure) D during a scavenging fire, to help put out the fire. 175.What do you consider as the most important task after a piston job ? A A search inside the crankcase for tools and rags. B Starting the auxillary blower to ventilate the scavenging belt, and the cylinder liners, to ensure that the engine has sufficient fresh air for starting. C Patch up destroyed paint work on the crankcase doors. D Starting the engine to see that it rotates 176.Why is it so important to keep the lub oil viscosity within safe limits? A To keep the oil protective film between moving metal surfaces . B The luboil viscosity has no influence on the oil's lubrication ability. C To keep the additives in good condition. D It is not important 177.Total Base Number ( TBN ) is important as a measure of neutralizing ability against strong Acids. What will You do if this TBN base number is reduced to a low level?-A Renew lub oil in the system.B Send one lub oil sample to new analysis. C Nothing.D Purify the oil system. 178.What can happen with a lub. oil cooled piston if you stop the lub. oil pump immediately after You stop the engine? A Nothing happens.B The oil flashpoint will be changed. C Overheating of the piston, and oil coke deposits in the cooling chambers D You save the oil sealings in the piston. 179.You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is high. What will you do? A Decrease the cooling water temperature for the oil. B Clean the system and change the oil C Increase the cooling water temperature for the oil. D Increase the lub oil pressure. 180.You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is low. What will you do? A Clean the system and change the oil.B Increase the oil temperature. C Start to purify the oil.D Decrease the oil temperature. 181.What could be the reason if the lub oil viscosity increase? A Heavy fuel oil leakage to the lub oil system.B The lub oil viscosity will not increase. C.Water-leakage to the lub oil system D High lub oil temperature. 182.What could be the reason if the lub oil viscosity decrease? A Heavy fuel oil leakage to the lub oil system. B Diesel oil leakage to the lub oil system C Low lub oil temperature. D Wrong lub oil pressure 183.A water content greater than 2 % is detected in a lub oil system. What is the best action to do?A Continuous purifying the system with the lub oil pumps running. B Boil out the water by increasing the temperature. C Segregate the oil in a seperate tank for continuous purifying. D It is no danger before the water level reach 6-8%. 184.What long term effect will excessively high temperature have on lubricating oil quality? A Cause oxidation which reduce viscosity.B Evaporates the oil giving high consumption. C The oil flashpoint will be changed.D Cause oxidation which increase viscosity. 185.Which would be the most suitable place to obtain an oil sample for analysis? A From the lub. oil pump suction line.B From the system pipeline C From the oil cooler drain.D From the filter drain. 186.If water contamination occurs in the crankcase oil of an auxiliary engine the oil viscosity will:-A Increase.B Nothing happens.C Stay at the same.D Decrease. 187.What type of lubricating oils are generally used in auxiliary engines? A Detergent.B Alkaline.C Synthetic.D It is not important. 188.In a Burmeister & Wain main engine, at what point is cylinder oil injected? A Just before "Top Dead Centre". B As the piston passes "The Lubrication Points" in a downward direction C As the piston passes "The Lubrication Points" in an upward direction D Just before "Bottom Dead Centre" 189.What differential pressure would you expect to find across an engine lub.oil filter? A 1.2 BarB 3.0 BarC ZeroD 0.2 Bar 190.You notice the sump level in an engine has increased and no new oil has been added. What action would you take? A Drain some oil from the engine. B Stop the engine and look for a fuel or water leak. C Reduced the load, and look after fuel or water leak. D Leave it the same. 191.Oil analysis results show a high level of tin. What could be the cause of this? A Bearing damage.B Water contamination. C Fuel contamination D Too high lub.oil temperature. 192.We have two kinds of turbocharging systems: constant pressure and impulse. The difference between these two can be found in: A The exhaust gas receiver.B Scavenging air coolers.C The blades on the exhaust gas turbine. D The scavenging valves of the engine. 193.We have a problem with surging in the turbocharger. Which of the following could be the cause?A Worn out bearings on the turbocharger. B The lubrication oil pump is malfunctioning.C Dirty rotor blades. D Dirty scavenging air cooler on the air side. 194.The revolutions on the turbocharger have increased during the night with unmanned engine. Could this be caused by: A The viscosity of the fuel is to high .B We have favourable winds and current. C The current and wind are holding the vessel back D Poor combustion due to malfunction of fuel valves 195.The turbocharger (constant pressure) is making "whoofing" noises. What might be the cause?A Heavy seas from behind.B A faulty turbocharger bearing. C One or more leaking exhaust-valve(s).D Strong current against 196.After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal? A 12.000 hours.B 4.000 hours.C 25.000 hours.D 30.000 hours. 197.The timing of the engine is delayed. The exhaust temperatures are high. How would you expect this to affect the turbocharger? A Decreased turbocharger revolutions. B Surging of the turbocharger. C Increased turbocharger revolutions D Higher air and gas temperature after turbocharger. 198.We have a problem with vibration in the turbocharger. What might be the cause? A Dirty air inlet filter. B The turbine rotor is not balanced C The lubricating oil needs to be changed. D Worn out turbocharger bearings. 199.With full load on the main engine, the RPM for the turbocharger is too low. What may cause this?A The diffuser ring is damaged. B Exhaust temperatures on the main engine are too high.C Dirty nozzle ring.D The lubricating oil pump is malfunctioning. 200.With full load on the main engine, the turbocharger tachometer reads: Too low RPM. Why? A Damaged connection between pick-up and tachometer unit B Pick up is not connected to turbocharger. C Turbocharger need to be cleaned/overhauled. D Pick up for tachometer is wrongly adjusted. 201.The lubricating oil on the exhaust side of the turbine blower gets very dirty after only a few hours in service. What can the reason be? A Exhaust gas leaking into the oil chamber .B Wrong type of oil used. C Lubricating oil is mixed with salt water D Worn out bearing turbine side 202.After water-washing the turbocharger exhaust side, the blower starts to vibrate. What has happened?-A Water drain for washing system is clogged. B Foundation bolts for the blower unit are loose C The rotor blades are damaged or the blades are not properly cleaned D Inlet filter partly clogged. 203.The blower's air delivery is not sufficient. What is the cause? A Air temperature in engine room too high.B Dirty scavenge duct. C Clogged air inlet filter.D Cooling water temperature too high 204.Why is it important to slow down the main engine RPM while water-washing the turbocharger? A To protect the bearings .B To protect the exhaustgas economizer. C To protect the blower side .D Not to damage the rotor blades. 205.Some engine manufacturers recommend that washing of the compressor side is not carried out. Is this due to: A Greasy sludge from the compressor sticking between the fins in the air coolers, necessitating extra cleaning of these. B Large volumes of water being carried over into the cylinders of the engine. C The nozzle ring becoming corroded D The thermal shock exhibited by the vanes. 206.What is the meaning of the term "valve clearance"? A The clearance between the rocker arm and valve pushrod. B The clearance between valve spindle disc and seat. C The clearance between the rocker arm and camshaft pushrod. D The clearance between the rocker arm and valve pushrod in either warm or cold state. 207.The meaning of lapping a valve and valve seat is:. A Adjust the overlapping of the inlet and exhaust valves. B Grind the valve against the valve seat to obtain a uniform sealing surface. C Machining the valve in a lathe machine. D Repair by welding. 208.Some 4-stroke engines are fitted with a rotorcap on the cylinder head valves. For what reason? A Rotate the inlet valve during operation. B Distribute the exhaust gas or the air inlet better to improve combustion. C Improve the scaling surface function, increase the service time of the exhaust valve in the engine D To prevent the valve spindle from sticking.. 209.When overhauling the cylinder covers on a modern 4-stroke engine, is it important not to interchange inlet and exhaust valves? A Not so important. B Important due to different material and working conditions. C Can be changed if same size.D Important due to different type size valve guide. 210.What is the purpose of the cylinder head safety valve? A To relieve excessive high pressure in the cylinder to protect the engine from being damaged. B To adjust the cylinder pressure to a safe working pressure. C A valve for safety stop (emergency) of the engine. D For indication of engine being overloaded. 211.Most of the engine makers recommend to change the cylinder head gaskets each time a piston overhaul is carried out. Why? A To obtain a proper sealing and correct distance between piston and cover in TDC position. B To increase the consumption of parts so they can make more money. C To avoid heat transfer to the cylinder head. D To be granted a proper sealing with a new gasket. 212.Some 4-stroke engines are equipped with cooled fuel valves. Why is it so important to keep the coolant's temperature correct? A For cooling only.B For preheating only C To avoid overheating the fuel nozzle D For cooling and to maintain correct viscosity on the fuel when injected ANS-1-B2-B3-D4-A5-A6-B7-D8-C9-D10-B11-C12-D13-A14-A15-C16-D17-C18-D19-B20-C21-C22-A23-A24-C25-C26-D27--C28-B29-D30-C31-B32-A33-C34-B35-D36-A37-C38-D39-A40-B41-C42-D43-D44-C45-A46-A47-C48-D49-C50-C51-B52-D53-B54-D55-C56-D57-C58-D59-A60-D61-A62-B63-B64-C65-B66-B67-A68-A69-D70-A71-B72-A73-B74-C75-D76-D77-B78-C79-B80-B81-C82-D83-D84-B85-C86-C87-A88-B89-D90-B91-B92-C93-B94-D95-C96-C97-C98-A99-A100-C101-D102-D103-D104-B105-A106-D107-A108-B109-D110-D111-D112-D113-D114-B115-D116-D117-B118-D119-D120-D121-C122-C123-C124-B125-C126-B127-B128-B129-C130-D131-D132-D133-B134-A135-D136-B137-C138-A139-D140-C141-D142-D143-D144-D145-D146-D147-B148D149A150A151B152A153A154A155A156B157D158C159A160D161C162B163C164C165A166C167B168C169D170A171A172A173B174C175A176A177A178C179B180A181A182B183C184D185B186A187A188C189D 190B191A192A193D194C195A196A197C198B199A200D201A202C203C204D205A206A207B208C209B210A211A212D