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