JULY MEP ONLINE QUESTION & ANSWERS

1.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

2.During flooding of a dry dock the following items must be verified

 (fb majority)

 A. All sea valves are operational

 B. All overboard discharge valves are operational

 C. Stern tube seal are operational

 D. All of the above

.3. Which type of valve is Bidirectional..

A.      Globe valve

B.      Gate valve

C.      Ball valve

D.      Butterfly valve

. 4.Which of the following V/V cannot be overhauled in place without removing piping?.

 A) Ball Valve (B) Diaphragm valve

 C) Globe valve (D) Butterfly valve---------------------------------not same but related Question

5. 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)

 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--------------------------------ans1

 C) Keep manoeuvring irrespective of damage to the turbines

 D) Request the bridge to try to reduce number of astern movements-------------------------ans2

6.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------------------------------ ANS

 D. Transmit latent heat of fusion

7.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

8. 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

9.shaft sealing of a main sea water pump for ship plying in coastal muddy waters, which is the best option

 A. Gland packing -----------------------------------------------not same but related Question on it

 B. Lip seal with garter spring

 C. Mechanical seal

 D. Cup seal

10.air compressor cooler tube compensating expansion  type… … (MCQ)

 a)spring tube

 b)floating tube 

c)fix tube

d)u tube

  11.The lower half of main bearing of a very large diesel engine can be removed by:

 A. Pulling out with a chain block

 B. By hammering out with the help of a soft mallet

 C. By slightly jacking the crankshaft and turning out the bearing half with a rope or similar tackle provided.

 D. By using a special tool in the oil hole and turning the shaft to turn out the lower half.

12.direction of rotation of centrifugal pump is reversed by changing the motor connections

 a. pump will deliver the liquid in reverse direction

 b. pump discharge and capacity will be affected ---------------------------------ANS for single

 c. efficiency will decrease

 d.casing get overheated

13.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

14.Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be:

A.  Throttle the steam outlet valve

B.  Renew the trap

 C.Lap the disc and the seat of the trap

 D. Throttle the steam inlet valve

15.when M/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.

16. 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

A) Cavitation

B) Erosion

 c) Impingment Corrosion

D) Cavitation Erosion-------------------------------------ANS

17.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 clarifier

18.If the direction of rotation of a gear pump is reversed due to change in-phase sequence, what happens when the pump is started?

 A. Direction of flow remains the same

B. The pump will get damaged due to overpressure on suction side

C. Pump relief valve will be lifted 

D. The direction of flow will be reversed

19.you must have used rubber reinforced joints. The reinforcement is normally provided using non asbestos fibres. The reinforcement is provided because

 A ordinary rubber gasket has porous matrix. Having capillaries which can allow liquid leakage when subjected to high pr.

B  to increase load carrying capacity of the joint so it can withstand high pr.

 C  to incr temp resistance of joint

 D to protect the joints from fire or other accidental damage.

20.Which of the following can lead to premature failure of roller bearings?

 A. Misalignment

 B. Contamination

 C. Shrinkage            

 D. Over greasing

21.Metal cladding provides protection to the metal essentially for the life of ship because

 A. During cladding the protective coating reacts chemically with the base metal and inhibits corrosion

 B. This is the only method in which the completeness of the metal coating can assured, while other methods are liable to defects

 C. The thickness of protective coating is greater compared to any other metal coating method used--Ans

 D. The adherence of coating is best in case of metal cladding

22.Butterfly valve stuck in half open position. Hw to repair…………………not same but related Q.

 a. Cant b taken out in open position fr line so try to close valve any how

 b. Apply hammer to shut it.

 c. Remove pipeline n do overhaul

 d. Cannot b repaired onboard.

.23. When steel components electroplated with chromium r used in corrosive environment

 a.Chrome plating prevents corrosion

 b.Protection to the steel will b preferentially corroded

 c.zinc plating is used on top of chrome plating for corrosion protection

 d.Thickness of chrome plating to increase

 24.Fire p/p1 water to deck discharge pr 5 bar deck hydrant not getting water. Fire p/p2 discharge pr 2.5 gives water. Fire pump 1 unable to send water to hydrant. What is the reason?

 a. Pump pressure gauge defective

 b. Overboard discharge v/v fully opened so water is not going to deck

 c. Pump suction filter choke

 d. Pump discharge v/v may b stuck

25.Which of the foll. Is false about hydraulic jacks/tensioning tools?(single option)

 a.Piston of the jack should b turned back by a certain degree after hand tightening to prevent easy removal after untightening of nut.

 b.Piston of the jack should not b turned back after hand tightening during untightening of the nut.

 c.Piston of the jack need not b turned back during tightening of the nut

 d.Hydraulic pressure need not b relieved during removal of jack.----------------------------------------ANS

26.After removing all the bonnet securing nuts of a large size globe valve it is found that the bonnet is not coming out because of strong adhesion of the gasket between the bonnet and the body. What are you going to do in line with the best practices?(choose the best alternative)

 A. A chain block can be hooked onto the handwheel and bonnet should be (freed out of gasket adhesion) lifted clear of the valve body

 B. Hammer the valve bonnet and the bridge from all sides using a big hammer until the bonnet is free?????????

 C. Use a hammer and chisel and try to force the chisel in, at the joint of bonnet and body equally from all the sides until the bonnet is clear ***

 D. Try to close the valve disc further onto the seat by turning the handwheel in closing direction so as to ??? jack-up??? the bonnet

27.Double entry impeller of centrifugal pump

 a. Inc. axial thrust

 b. Inc. motor load

 c. Red. Load on pump bearings

 d. Inc. load on pump

28.Corrosion resistance of ss in presence of o2 in aerated water??---------------Not same but related Q. on it..

 A o2 inhibits chemical reaction.

 B o2 combines with ss to form passive oxide layer

 C o2 gets absorbed into ss

29.Yourship has ows and reciprocating bilge pp of capacity 2 m3/hr. it takes about 12 hrs to pp out whole bilge tk by that pp. the ship is going to drydock. And chief engr recommending company to install a centrifugal pp of capacity of 10 m3/hr. as a bilge pp so entire bilge tk can b pped out in 2.5 hrs.the company should:

 A accept the proposal as a centrifugal pp has several advantages over a reciprocatin pp.

 B there is no q of acceptin a c/f pp as bilge pp------------------------------------------------------------------ANS

 C propose to fix a gear pp instead of a centrifugal pp

 D pipelines and pps once designed cant b changed as they are class approved

30.Net Positive Suction Head is the

 A. Difference of Total suction head and Total discharge head

 B. Difference of static head and the frictional head

 C. Difference of dynamic suction head and the vapour pressure of liquid

 D. Difference of Static suction head and the vapour pressure of liquid

31.the size of solid particle contaminants in hydraulic systems is measured in:

 A.Millimeter cubed

 B.Nano-millimeter

 C.Microns

 D.Micro millimeter

32.Which of the following types of boiler burners have maximum turn down ratio?

 A. Pressure jet type

 B. Spinning cup burner

 C.Spill type burner

 D. Y-jet type burner

33.U have seen and operated several valves onboard ships. All the butterfly valve operation handles are operated by a locking arrangement because:

 A. Butterfly valves do not used gland packings and thus spindle doesn???t have anything to keep it in position and can open by vibration

 B. Butterfly valve does have a spindle packing but same cannot be excessively tightened to have good grip on the spindle to prevent it from opening against vibration

 C. Butterfly valves can move by vibration but that is not the main consideration, the main consideration being opening/closing against liquid pressure

 D. All the butterfly valves do not have locking arrangement as there is no such requirement for the same

34.Excessive lubrication in compressors can lead to: multiple

 A. Sticking of valves

 B. Carryover and deposit of oil particles in pipelines and reservoirs

 C. Decompression

 D. Detonation

35.In a three phase electrical equipment, the immediate action in the event of a fuse blowing in one of the phases, would be:

 A. To replace with a fuse of correct rating

 B. To replace fuses on all three phases

 C. To try to repair the fuse

 D. To investigate the fault that led to the blowing of the fuse---------------ANS

36.In a shell and type M/E L.O. cooler, the temperature of L.O. is controlled by an automatic temperature control valve. Out at sea with M/E running at sea load it is observed that the temperature control valve opening to the cooler is increasing day by until it becomes 100% open to the cooler. The L.O. outlet temperature _______________ after the above condition has reached

 A. Starts decreasing immediately

 B. Starts increasing immediately

 C. Will be maintained at the set point of the temperature controller

 D. Cannot be maintained at the set point and will increase slowly

37.During shutting down the purifier you find that purifier always vibrates heavily for some time and then becomes normal until it finally comes to a stop. What is wrong with purifier?

 A. The purifier design is faulty

 B. The purifier bowl has a heavy sludge deposit and requires cleaning

 C. The purifier bowl is not balanced properly

 D. During shutting down most of the purifiers pass through the critical speed zone

38.Which of the following can cause exhaust with white smoke in a diesel engine?

 A. Choked air filter of turbocharger

 B. Water mixed with fuel-------------------------ANS

 C. Bad atomization of fuel

 D. Overload

39.in a centrifugal pump discharge must be in the direction as that of

 a. direction of vane curvature from eye to impeller

 b. direction of vane curvature from impeller to eye

 c. depends on shape of volute casing ------------ ( single C, multi ac)

 d.none of the above

40.which of the following would be the correct way(s) of using a torque wrench?     {mcq}  but only single Ans D

 a. application of jerk pulls while tightening

 b. using an extension

 c. tightening beyond the characteristic clicking sound

 d. none of the above

41.After cleaning the sea chest filter you have placed the filter in the

 body and tightened the cover. Which one of the following is the best

 alternative?----------------------------------=-------------------------------------------------------same related Question

 A. You can open the filter inlet and outlet valves & directly start using the filter

 B. If you do not want to use the sea chest in question, you need not worry and you can open the

 valves when required

 C. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and

 thereafter filter can be kept isolated or used as required

 D. You will close the other side sea chest valves first and then open this side sea chest filter inlet and

42.The centrifugal pump r normally

 A) Positive displacement type

 B) Rotodynamic

 C) Screw type

 D)Gear type

43.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 glo nssiness 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

44.Corrosion of mild steel can b effectively prevented by

 A) Cathodic protection

 B) Protective coatings

 C) Addition of suitable alloying elements

45. nr vv of msw pp is leaking in closed position. U have a return type of vv onboard of same dimension. What wil u do?

 A do nothing and run same pp order for a new one.

 B replace and run the same pp keeping the other stby until new vv arrives.

 C put blank on the vv and run other pp

46..Which of the following instruments measures propeller drop?

 A. Poker Gauge

 B. Telescopic feeler gauge

 C. Trammel

D. Propeller drop gauge

47.Phosphorus Bronze is an alloy typically consisting of :-

A. Copper , lead & tin

 B. Copper , Zinc & lead

 C. Copper , Zinc & phosphorus

 D. Copper , Tin & phosphorus

48.Which one of the following is a type of corrosion protectionman :-

 A. Cladding-----------------------------------------ANS

 B.  

 C. Graphitisation

 D. none

49.Purifier not rotating wid desired rpm. reason

 a. frequency low

 b.busbar voltage low

 c. friction pads worn out

50.VESSEL IS AT DRYDOCK , WHO ISSUE HOT WORK PERMIT…??? Options were

 A.CE,

 B.2E,

 C.shipyard engineer, or

 D.ship superitendendent