Correct Mep Ans

8/10/2019 Correct Mep Ans

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3. Which of the following is NOT a correct point for sampling of system lube oil for on board or shoreanalysis? (Sure ans)A. StandpipesB. Purifier outletsC. Inlet or outlet of L. O. coolersD. Tank drains

4. The ballast valve of the fore peak tank is located in the duct keel and cannot be opened or shut byremote operation. The valves of other tanks can be operated remotely without any trouble which of thefollowing will be the best practice? (sure ans)A. Valve should be checked locally for troubleshooting without which it is difficult to find the exactproblem B. The actuator must be defective and should be replaced with a new oneC. The control circuit is defective and the PCB should be replacedD. Shore assistance will be required in such cases

5. Pump Start But Motor gets overloaded or Trip on overload. ( multiple answer)A. Alignment is wrongB. Gland packing too tightC. Worn out / Damaged ball bearingD. Cavitation exists

8. When running TWO centrifugal Pumps in parallel, Flow rate "Q" is increased.(sure ans)

A. TRUE B. FalseC. May BeD. I Don't know

10. Normally so called single screw pumps are used as sludge pumps in engine room. What is the correcttechnical name of these pumps?A. Snake PumpB. Screw PumpC. Progressive cavity pump D. Gerotor

13. 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 systemD)None of the above

15. While refloating the vessel after dry docking which of the following check should beCarried out

A) Sounding of all double bottom tanksB) Checking leakages in the stern tube header tksC) Checking leakages of shipside valvesD) Checking level of stern tube, header tanks(majority)

11.NPSH and the Total suction head are two terms which are commonly used for pumps. Which ofthe following is a true statement?

A. They are one and the same thingB. Total suction head is greater than NPSH


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C. NPSH is always greater than Total suction headD. Total suction head and NPSH have no relationship

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

(fb majority)A. All sea valves are operationalB. All overboard discharge valves are operationalC. Stern tube seal are operationalD. All of the above

9. In which of the following types of refractory failure, softening of the refractory bricks takes place dueto presence of sodium/vanadium in fuel?

A. SpallingB. CrackingC. Shrinkage crackingD. Slagging

12. Which of the following V/V cannot be overhauled in place without removing piping? A) Ball Valve (B) Diaphragm valveC) Globe valve (D) Butterfly valve 16. Why should only approved toilet cleaning chemicals be used in

A) Unapproved chemicals can lead to corrosion in the systemB) unapproved chemicals can lead to toxic conditions in the system leadingC) To destruction of protective coatingsD) Unapproved chemicals can kill aerobic bacteria making the plant ineffectiveGases produced by use of unapproved chemicals can pose threat to the operatorsv

17) After ofver hauling reciprocal pump the motor connections were wrongly given.Determine outcome when pump is started? (Sure ans wid majority)

A) The direction of flow wl remain unaffectedB) the direction of flow wl b reversedC) The pump wl get damaged because the suction valve wl block the reverse flow causingoverpressure leading to pump breakdown.D) The pump wl lose suction N there wl b no flow.

18) Pump driven type clutch attached to vacuum pump r commonly used forpriming ballast pump n emergency fir pump. What is the factor whichclutches the vacuum pump to pump the clutch during start of the pump.

A) Low suction pressure acting against the spring loaded clutching pistonB) High suction pressure actiong against the spring loaded clutching piston

C) Low discharge pressure acting against the spring loaded clutching pistonD) High discharge pressure acting against the spring loaded clutching piston

20. A thin layer of electrolyte trapped in a small pits on a metal surface , and remaining stagnant over aperiod of time , may cause :A. ErosionB. Bimetallic corrosionC. Crevice corrosion D. Corrosion

21. The purpose of an evaporator in the domestic refrigeration system is toA. Transmit latent heat of evaporation B. Absorb latent heat of fusionC. Absorb latent heat of evaporation D. Transmit latent heat of fusion


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23. 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 heatgeneratedB. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of amotor.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

24. The attached vacuum pump of a ballast pump operates on the principle of a:A. Centrifugal pumpB. Reciprocating pumpC. Gear PumpD. Vane Pump

25. 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 speedC. Flow rate doesn't depend upon speedD. Flow

26. Vacuum priming pumps which work on the principle of fixed vane pumps require _____________for___________ clearance between vane tips and casing.A. Lube oil, lubricatingB. Lube oil, sealingC. Water, sealing D. Gland packing, sealing

27. Which one of the following is a type of corrosion :-A. ElectroplatingB. GalvanisationC. Graphitisation

D. Demulsification

28. 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 notB. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pumpis reversedC. The discharge of reciprocating pump is pulsating and discharge rate is lesserD. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumpscan be used

29. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power willA. increase B. decrease C. Will not be affected as the pump power depends only on the flow capacityD. None of the above

30)shaft sealing of a main sea water pump for ship plying in coastal muddy waters, which is the bestoption

A. Gland packingB. Lip seal with garter springC. Mechanical sealD. Cup seal

32)removable sleeves on centrifugal pump shaft:a) make easier to replace pump shaft packing b) they can be economically replaced as they wear outc) to lighten weight of pump d)increase strength of shaft


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33) 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 waterbut still the pump doesn???t take suction from any of the bilgewells or bilge tank.What could have gone wrong inside the pump? Choose the best alternative.

A. The bucket rings have worn outB. The suction or discharge valve must have worn out and started leakingC. The suction or discharge valve might be stuck in one position or some debris mighthave lodgeditselfin between the valve and the seatD. Pump suction filter might be clogged

34)air compressor cooler tube type(doubt)a)spring tubeb)floating tubec)fix tubed)u tube

36)Which of the following option gives you the correct sequence of the metals in decreasingorder of preferential corrosion when all of them are bonded and immersed in an electrolyte ?

A.Titanium, Mild Steel , Zinc , Stainless steelB.Titanium , Stainless steel ,Mild Steel ,ZincC. Zinc , Mild Steel , Stainless steel , Titanium

D.Zinc , Titanium , Mild Steel , Stainless steel

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

A. Pulling out with a chain blockB. By hammering out with the help of a soft malletC. By slightly jacking the crankshaft and turning out the bearing half with a rope or similar tackleprovided.

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

40) pl answer the following question.Purifier leaking bowl opened, cleaned n seal ring changed n putback bt still leakingwat might b wronga. high tempb. high density

c. disc size nt properd. rpm low

41. Surface preparation of steel surfaces, prior carrying out painting isimportant because (choose the bestalternative):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 outC. Surface will be very rough if proper surface preparation is not carried outD. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causesstrong bonding

42. Accelerated corrosion due to removal of protective surface films (e.g.) oxide layers on metal/alloysurfaces due to turbulence of working fluid is known asa) Bimetallic corrosionb) Impingement corrosion


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c) Cavitation erosiond) Selective phase corrosion

44)In shell and plate type coolers, due to improper flow design or partial blockage of tubes may leadto high turbulence locally. This condition may lead to (choose the best alternatives):

A. Bimetallic corrosionB. Selective phase corrosionC. ErosionD. Impingement corrosion

(multi then c n d. single choice d)

45)You have overhauled a centrifugal pump and while assembling forgot to install the o-ring betweenthe sleeve (provided in way of gland packing) and the shaft. What impact does this have?

A. It will not affect the pump in any wayB. It will cause leakage of fluid(air/water) in between the shaft and the sleeve and will affect thepump performanceC. It will not affect the pump performance n any way but will corrode the shaft between the o-ringand shaftD. It will cause dynamic imbalance of the shaft

46)Which of the following is a true statement ? (choose more than one option if true) A. Mild steel will be subject to preferential corrosion when in electrical continuity with stainless steelin presence of an electrolyte B. Stainless steel will be subject to preferential corrosion when in electrical continuity with Mild steelin presence of an electrolyteC. Copper will be subject to preferential corrosion when in electrical continuity with Mild steel inpresence of an electrolyteD. Zinc will be subject to preferential corrosion when in electrical continuity with Aluminium inpresence of an electrolyte

47) boiler pp operate at an elevated temp and pressure. The ideal materials for the pp casing andimpeller shud b

A gunmetal casing, al bronze impeller

B high gade CI casing, bronze impeller

C cast steel casing, SS impeller

D cast steel casing, al bronze impeller

49)screw pump is generally are ??????????????? pumpa. slow speedb. high speed c. medium speedd. all of the above

50)the gland packing of centrifugal pumpa) should not allow any breakage under the suction pressure.b) should only allow drop by drop continuous leakage under positive suction pressure. c) should onlyallow drop by drop continual leakage under positive suction pressure.d) should allow considerable leakage

53). Corrosion protection of steel surfaces by zinc coating can be carried out only at temperaturesbelow 65 deg. C. For higher temperatures..


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a) Zinc reacts very fast and thus can only provide protection for a limited timeb) Zinc reacts with steel and protective layer vanishes due to chemical reactionc) Steel may corrode preferentially to the zincd) Dezincification occurs leading to removal of zinc coating

(Reference http://www.ingal.com.au/FAQ/faq24.html written clearly here that reversal of polaritytakes pace at temp more than 70 deg.)

59) Which of the foll. is a true statement A) Aluminium will b subject to preferential corrosion when in electricalcontinuity with stainless steel in presence of an electrolyte. b) Stainless steel will b subject to preferential corrosion when in electrical continuity with mild steel inp resence of an electrolyte.C) Copper will b subject to preferential corrosion when in electrical continuity with stainlesssteel inpresence of an electrolyted) Aluminum will b subject to preferential corrosion when in electrical continuity with zinc in presenceof an electrolyte

60)main engine is running but viscosity of fuel cannot be maintained.fuel oil heater have a maximumrating of 4 bar steam pressure.steam through a pressure reducing valve is provided to the heater at 4bar but still viscosity of fuel annot be brought down below 20 cst. as a good marine engineeringpractice what will you do? a. let the engine run at same rpm n wait for the port to come to carry outthe cleaning of heater b. reduce the rpm till next port arrives n then clean the heaters c. increase thesteam pressure by adjusting the setting of steam reducing valve d. stop the engine n clean theheaters

62)Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate aftercleaning, 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

56)Cadmium coatings provide corrosion protection . Cadmium coatings are commercially carried outusing which of the following methods :-

A. Metal SprayingB. Electro-platingC. Hot-dippingD. Metal diffusion

63. Resistance to corrosion of Aluminium alloys is due to : A. Aluminium being a very noble metal when compared to other metals in Electrochemical seriesB. Formation of Aluminium oxide(Alumina) passive film on surfaceC. The rate of corrosion is very low due to very high corrosion potentialD. All of the above
http://www.ingal.com.au/FAQ/faq24.htmlhttp://www.ingal.com.au/FAQ/faq24.htmlhttp://www.ingal.com.au/FAQ/faq24.htmlhttp://www.ingal.com.au/FAQ/faq24.html


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64)Fuels as produced in a refinery are generally sterile, however, contamination can occur as fuelsare

A.stored at the refineryB. stored on the vesselC.transported to the distribution sitesD.All of the above are correct

67)During prolonged astern manoeuvring of the relative expansion between any of the turbine itscasing 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 damagedB) Reduce the vacuum further to control the relative expansion C) Keep manoeuvring irrespective of damage to the turbinesD) Request the bridge to try to reduce number of astern movements

68)If three Centrifugal pumps are running in parallel and the backpressure is substantially increased,what effect will be observed on the pumps in use.

A. Flow rate will reduce.B. Increase in the pump casing temperature .C. Safety alarms and trips (high casing Temperature) will activate, if no corrective action takenD. None of the above.E. All of the above

69.Before putting into operation a coalescer type Oily Water Separator, it is important to:

A. Fill it up with purge waterB. Drain it completelyC. Switch off the heaterD. Keep the three way valve manually open

70.The water from discharge side of the a centrifugal pump is supplied as sealing water to thestuffing box for the pump shaft at:

A. Sealing ring

B. Shaft sleeve

C. Lantern ring

D. Neck bush

71.Process of enrichment of surface of steel and steel alloys by zinc using Electroplating is known as

A. Cathodisation

B. Galvanisation

C. Neutralisation

D. Dezincification

72)Which of the following will be required to be done in order to reduce sulphur corrosion of Main

Engine components


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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 andother as clarifier

74.If the direction of rotation of a gear pump is reversed due to change in-phase sequence, whathappens 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

75.resistance testing should be ideally done on electrical equipment when the equipment is :

A. Cold

B. Hot or at working temperature

C. In operation

D. At part load

77.All other conditions remaining constant, when centrifugal pump is changed over for pumping aliquid of higher specific gravity, the discharge head of the pump at the rated capacity will

A. increase

B. decrease

C. Remain same

D. Can???t say, depends on other factors too

78.The process of depositing chromium on to steel surfaces by diffusion coating is known as :

A. Galvanising

B. Chromising

C. Calorising

D. Coppering

81.When centrifugal pump is changed over for pumping a liquid of higher specific gravity which of thefollowing is going to change?

A. Discharge pressure

B. Discharge head


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C. Power consumption

D. Pump speed

80.For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W.temperature through the coolerhas decreased from 12 deg. C to 7 deg. C over a period of time, while the drop in temperature ofL.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 inthe 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. sideor L.O. side

D. S.W. side of the cooler may be partially blocked with mud and sea shells

6. The most important control measure to prevent boiler tube failure is:A. Use of proper refractory materialB. Proper maintenance of fuel burning equipmentC. Proper maintenance of boiler water conditionD. All of the above

84)A ball vv found leaking in service needs to be overhauled. What type of repairs can b 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 non metallic seats get wornout and have to be replaced

D normally ball gets damaged and has to be replaced.

86)It is a known fact that centrifugal pps require priing for pumping liquids, as they cant handle airand will lose suction due to air entry. But on the other hand t/cs use centrifugal compressors forsupercharging. Which of the following do u think makes a centrifugal compr to pump air and behavedifferently than the centri. Pps?

A presence of air cooler

B presence of labyrinth seal

C high speed of rotation, very fine internal clearance and large impeller diameters.

D difference in the principe of operation.

88-The function of an accumulator on the discharge side of a reciprocating bilge pump is to: A. Supply liquid even when the pump is not running

B. Dampen out the pressure pulses and smoothen the flowC. Increase the discharge pressure by storing liquid under pressureD. No such device is required to be fitted to modern bilge pumps


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89-F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is asounding of 6.0 m in the F.O. deep tank. The suction pressure gauge was renewed recently and isshowing a positive pressure whenpump is running, but Pump is not transferring any F.O. What is themost probable cause?

A. Pump is damaged and needs overhaul

B. Suction filter cover gasket might leaking

C. Pump relief valve might be leaking

D. The pump suction pipeline is blocked

90) you must have used rubber reinforced joints. The reinforcement is normally provided using nonasbestos fibres. The reinforcement is provided because

A ordinary rubber gasket has porous matrix. Having capillaries which can allow liquid leakage whensubjected 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.

91.Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing

92)Static suction head of the pp is

a. distance of the suction liq lvl above the centre line of the pp

b. distance of the suction liq lvl below the centre line of the pp

c. force necessary to overcome frictional losses in the pp and piping

d. amt in inches of mercury the total suctn head is below atm pr.

93) centrifugal pp will typically give u low flow rate at low pr. Where a piston pp wil give u more prand high flow rate. Is the statement correct?

A true

B false

C 1st one right 2 nd one wrong

D I dnt know


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95)Stm stop vv is eased off its seat during blr start up for??

A to alow thermal expansion of parts.

B to allow stm flow during start up

C to prevent water hammer

D all of the above

96) which of the following is the material is used to manufacture tube plates of a shell and tube typeheat xchanger?

A cupro nickel

B al brass

C admiralty brass

D gunmetal

98)The common term used for failure of metal and alloys in a corrosiveenvironment , when subject to high stresses is known as : majority

A. Fatigue failureB. Corrosion fatigueC. Stress corrosion crackingD. Fretting Corrosion

101-Graphitisation is the term used to describe: A Bimetallic corrosion of brass and bronze alloys leading to deposition of graphiteb Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading toloss of strength c Electroplating process in which graphite is deposited on the mild steel components to protect themagainst corrosiond Chemical reaction between pure graphite and iron so as to increase the graphite content of iron(not sure

107. Reciprocating compressors lines are fitted with a _______ to keep the discharge free of pulses

a. Accumulator b. Unloaderc. Safety valved. Pressure reducing valve

108. Which of these not self actuating valves.a. Check valveb. b. relief valvec. c. ball valved. d. safety valve

106)sea water outlet temp. of a lube oil cooler decreases but inlet temp. remains same. load on mainengine is also constant what can be concluded from thisa. decrease in cooler efficiency (Ans)b increase in cooler efficiency


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c. decrease in lube oil temp.d. increase in lube oil temp

111. Emergency fire pump has been lined up for supplying to fire hydrant on deck. AsSoon as pump is started the vacuum pp engages. The suction of the pump goes intoHigh vacuum but the pump discharge pressure remains zero, and the vacuum pumpDoesn???t disengage ? What is the most probable cause for the pump not to takeSuction?

a. The discharge pressure gauge is defective showing zero discharge pressureb. The pump suction filter might be clogged c. The suction pressure gauge is defective showing high vacuumd. The vacuum pump is defective

112. Boiler not stating in 2-3 time, what we doa. Check fuel ignition system b. Check fuel burning systemc. Check furnaced. All above

115. The seating mtrl. For perfectly sealing type Ball Valves is usually made up ofa. Rubber b. PTFE or Nylon C. Rubber reinforced with steel wire d. Stainless steel b and c

114 )Which of the following can be done to reduce the cold corrosion of Main Engine cylinderliners using high sulphur fuel oil :- A. Increasing cylinder oil feed rateB. Using high TBN cylinder oil

C. Increasing scavenge air temperatureD. Decreasing cylinder oil feed rate

127. Auxillary engine connecting rod bottom end bolts should be tighteneda. only as per prescribed torque using a torque ranb. as per prescribed torque as well as angular measurements as recommended by manufacturersc. by foll. Previous match marks on bolt heads n connecting rod bodyd. as per prescribedtorque n another 10% increase during every subsequent tightening(sure fb majority)139)Before starting a centrifugal pp eith priming pp, it shud b insured that _____ is at the correctlevel.

A lube oil

B sealing water

C fuel oil

D sealing oil

151)A reciprocating pump is used for Engine room bilge service because:

A.Reciprocating pumps are designed for smoother dischargeB.Only small capacity pumping capacity is required, while other pumps are of higher capacityC.It doesn???t churn and mix the bilge water unlike other types of rotary and rotodynamicpumps


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D.Shipbuilding industry is still going on old concept, future ships will have centrifugal pumps installed

147)In a sw cooled jw cooler the most common cause for loss of cooler efficiency is

A scale formation on jcw side

B mud or slit deposits on jcw side

C scale formation on sw side

D none of the above

146)Carbon content in steel?

A less than 1%

B less than 2 %

C less than 3 %

D any carbon content

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

A. Pressure jet type

B. Spinning cup burnerC. Spill type burnerD. Y-jet type burner

157)U have seen and operated several valves onboard ships. All the butterfly valve operationhandles 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 inposition and can open by vibration

B. Butterfly valve does have a spindle packing but same cannot be excessively tightened to havegood 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 mainconsideration being opening/closing against liquid pressure

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

158) SCREW P/P NORMALLY USED FOR

A.FLUID WITH HIGH VISCOCITY


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B.FOR BETTER PERFORMANCE AT VARIABLE TEMP.

C FLUID MIXED WITH SOLIDS

D ALL ABOVE

159) CENTRIFUGAL P/P REQUIRED PRIMING BCOS THEY UNABLE TO HANDLE

A VOLATILE LIQUID

B HIGH TEMP LIQUID

C LIGHTER LIQUID

D AIR & GAS

160)WHEN TWO DISSIMILAR METAL HAVING ELECTRICAL CONTINUITY ARE PLACED IN ELECTROLYTE

THE TYPE OF CORROSION

A SELECTIVE PHASE CORROSION

B CAVITATION ERROSION

C BIMETAL CORROSION

D CORROSION FATIGUE

161) CAVITATION OF CENTRIFUGAL P/P

A NPSHr>NPSHa

B NPSHa>NPSHr

C total suction head NPSHr

164.Which of the following cannot be used as sacrificial anode for the protection of Mild steelstructure against corrosion :

A. CadmiumB. MagnesiumC. Copper D. Aluminium165.Excessive lubrication in compressors can lead to: multiple

A. Sticking of valvesB. Carryover and deposit of oil particles in pipelines and reservoirs C. DecompressionD. Detonation

166. The pumps performance depends upon

A. Clearance between the wear ring and the impeller


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B. Clearance between the impeller and the casingC. Clearance between impeller and shaftD. Clearance between mechanical seal and shaft

167)A multistage centrifugal pump is normally used

A. High head B. High discharge flowC. High viscous fluidsD. Low viscous fluid

170. During auxiliary engine de-carbonization, which of the following checks need to be carried out?

A. Sounding of all double bottom tanksB. Connecting rod big end ovalityC. Liner wearD. Crack detection tests on connecting rod serrations

171.In a reciprocating pump the direction of flow depends upon:

A. Direction of rotation of the pumpB. Position & fixing of suction and discharge valvesC. High pressure to low pressureD. Whether pump is single acting or double acting

172.Fire side in boilers gets commonly corroded due to :

A. Galvanic actionB. Formation of Vanadium pentaoxide and sulphuric acid C. Stress corrosionD. Crevice corrosion

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

A. The purifier design is faultyB. The purifier bowl has a heavy sludge deposit and requires cleaningC. The purifier bowl is not balanced properlyD. During shutting down most of the purifiers pass through the critical speed zone

175.Which of the following can cause exhaust with black smoke in a diesel engine?multi choice

A. Choked air filter of turbochargerB. Water mixed with fuelC. Bad atomization of fuelD. Overload

176).the purpose of the wearing rings used in a centrifugal pump is to

A. Prevent internal explosion in the pump when it is overheatedB. Enable a visual inspection of the pump when it is runningC. Ensure a proper alignment of the pump coupling to the driverD. To isolate suction and discharge side

179)in impressed current cathodic protection system , the current for cathodic protection is suppliedby :


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a. use of sacrificial anodesb. a low voltage dc supplyc. a low voltage a.c. supplyd. 110 v a.c. supply

181)a centrifugal pump may fail to deliver water when first started if the _________.a: water seal pipe is pluggedb: pump is not primed c: seal ring is improperly locatedd: impeller is flooded

184) you are pumping out sludge to a shore facility using your sludge pump. you find that thedischarge rate of pump is very slow and suction filter is getting clogged frequently.what is the bestalternative to counteract the problem? a.remove the pump suction filter and pump out the tank b.increase the tank temperature, keep an eye on the pump suction pressure and clean the filter as soonas it drops c. as soon as the as the shore facility tells you that they are not receiving any sludge, youstop the pump and clean the filter d. fabricate a bigger mesh size suction filter and use in place of

normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate

199) Super chlorinating of fresh water tanks in dry dock is done by: A. Washing the tanks with 100ppm chlorine solutionB. Washing the tanks with 50ppm chlorine solutionC. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean waterD. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water(sure ans ref mcgeorge)

202) Which of the foll wl cause cavitationa. Low discharge pressureb. Throttling the suction valve c. Low water level in the wet welld. High discharge pressure

82. use of synthetic polymer treatment limited to low pressure boiler why(correct)a-does not prevention of scale formationb- does not prevent the sludge formationc- does not have po4 to tackle caustic embrittlement d- all of the above

83.auxiliary engine crankpin bearings are normally renewed.

a.at each de-carbonisationb.at alternate de-carbonisationc. at 10000 hours intervald.after checking the bearings weardown

102-.Hot corrosion in exhaust valves and fire side of boiler mainly when :

A. Fuels containing vanadium content with high sodium content are usedB. Fuels containing vanadium content with low sodium content are used C. Fuels containing high vanadium and high sulphur content are usedD. Fuels containing high sulphur content is used and the exhaust temperatures are uncontrolled andexceed 600 deg. C

105 .Cladding is the process used for :-


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A.Protection of metal surfaces against corrosionB.Protection of metal surfaces against erosionC.Protection of metal surfaces against cavitation erosionD.Protection of metal surfaces impingement corrosion

104- 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 corrosionB. This is the only method in which the completeness of the metal coating can assured, while othermethods are liable to defects C. The thickness of protective coating is greater compared to any other metal coating method usedD. The adherence of coating is best in case of metal cladding

109. When centrifugal pump is overhauled it was found that shaft had developed grooves on it n nospare is available onboard what action can be taken

a. Order a new spareb. Assemble the pump without doing anything n wait for the spare to arrive . c. Machine the shaft sleeve on lathe n put back the new packing. d. Leave the pump as it is

117. Refer compressor oil should hv following properties:-

a. Chemically inert wrt refrigerantb. Should b able to perform at lower temp (viscosity n cloud point)c. Should hv a certain emulsification properties with water..d. Should absorb water but still perform the lubrication

121. Dirty air filter on a Centrifugal Blower causea. Overheatingb. Cavitationc. Vibrationd. All

122.____ Provide in protection against mild steel galvanic corrosion

a. Copperb. Aluminiumc. Stainless steeld. None

119. Cavitation erosion occurs due toa. Chemical action b. Physical action c. Chemical OR physical action d.Combination of chemical or physical action

123. 2. Fire p/p1 water to deck discharge pr 5 bar deck hydrant not getting water. Fire p/p2discharge pr 2.5 gives water. Fire pump 1 unable to send water to hydrant. What is the reason?a. Pump pressure gauge defectiveb. Overboard discharge v/v fully opened so water is not going to deckc. Pump suction filter choked. Pump discharge v/v may b stuck


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125. Best sealing is which vv>?a. Globe valveb. Butterfly valvec. Gate valved. Ball valve

130. What is the purpose of the Bypass valve ( Automatic or Manualoperated) on the positive displacement pump?

A. Control the Discharge Pressure B. Another valve provided for DischargingC. Not requiredD. I don't know

132.After removing all the bonnet securing nuts of a large size globe valve it is found that the bonnetis not coming out because of strong adhesion of the gasket between the bonnet and the body. Whatare 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 gasketadhesion) lifted clear of the valve bodyB. Hammer the valve bonnet and the bridge from all sides using a big hammer until the bonnet isfree?????????C. Use a hammer and chisel and try to force the chisel in, at the joint of bonnet and body equallyfrom 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 asto ??? jack-up??? the bonnet

134)the crank web deflection readings of a diesel engine would be erroneous in which of thefollowing conditions?

a. when the draught of the vessel has changed while readings were being taken

b. when ca rgo loading and discharging has been too rapid

c. when the crankcase temperature has changed substantially during the process of taking thereadings d. none of the above

137)Corrosion resistance of ss in presence of o2 in aerated water??

A o2 inhibits chemical reaction.

B o2 combines with ss to form passive oxide layer

C o2 gets absorbed into ss.

162The corrosion protection for Cooling Fresh Water systems of Marine Diesel Engines is normallyprovided by :

A. Sacrificial anodesB. ICCPC. Protective Metal coatings of system componentsD. Addition of corrosion inhibitors to the Cooling Fresh water

169. A drain cooler is provided with S.W. cooling. What is the best way to increase the temperature

of condensate draining to the hotwell?


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A. Throttle the S.W. inlet valveB. Throttle the S.W. outlet valveC. Open the condensate Bypass to the cooler D. Close the condensate bypass to the cooler

178)boiler corrosion is prevented above 100 deg by formation of a protective layer inside ofa. ferrous hydroxideb. magnetite c. haematite d. iron sulphate

180) in a centrifugal pump discharge must be in the direction as that ofa. direction of vane curvature from eye to impeller b. direction of vane curvature from impeller to eyec. depends on shape of volute casing d.none of the above

186) which of the following statement is false abt galvanic corrosion?

a. metals close to anodic end of the galvanic series corrode in preference to ones close to cathodicend.

B when any single metal exist in the system it cant corrode due to galvanic action.

C zn is anodic to steel and is often used as protective coating

D corrosion rate is affected by temp

185)which of the following would be the correct way(s) of using a torque wrench? (mcq)a. application of jerk pulls while tighteningb. using an extensionc. tightening beyond the characteristic clicking soundd. none of the above

188)After cleaning the sea chest filter you have placed the filter in thebody and tightened the cover. Which one of the following is the bestalternative?

A. You can open the filter inlet and outlet valves & directly start using the filterB. If you do not want to use the sea chest in question, you need not worry and you can open thevalves when requiredC. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages andthereafter filter can be kept isolated or used as requiredD. You will close the other side sea chest valves first and then open this side sea chest filter inlet and

203) With ref. to centrifugal pump charac, what wl b the effect when p/p is started withSuc v/v closed or disc v/v closed:a. Suc v/v shut head & flow rate wl be o; disc v/v shut flow rate wl b o n head wl b max. height .b. Suc v/v shut head wl b o & flow rate wl b min , disc v/v shut flow rate wl b o head wl b min. ht.c. Suc v/v shut head n flow rate wl be o; disc v/v shut flow rate wl b min n head wl b

At min htd. None

210). For any p/p max. theoretical lifta. 10.5 ft b. 10.2 mtr. C. 10.5 mtrd. 12.0 mtr e. none ( mcgeorge given 10.3m)


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209). The best way to clean compressor impeller of an auxiliary engine turbocharger wouldBe:sure a. By soaking it overnight in a strong chemical solution like carbon remover or airCooler cleaning chemicalb. By chipping the dirt off the impeller bladesc. By using a pneumatic wire brushd. By soaking in warm water n then cleaning it gently by rags

Purpose of balancing hole on single entry enclosed type impeller of cf p/pa)static balancing of imellerb) dynamic balancing of impellerc) balance out axial thrust on the impeller & hence the shaftd)to reduce weight of impeller at the same time of dynamic balancing the complte rotating assembly

219)Primary advantage of central cooling sys is

A more simplified cooling ckt

B most part of the clg sys being fresh water based, corrosion is minimized

C it allows better control of temp.by using fewer cntrollers

D all of the above

212)desludging seq for pfr???

A stop feed- give sealing water- close sealing wat- shut operating water- open and close desludgingwat quickly

B stop feed-shut operating water- open and close desludging water quickly

C shut operating water- stop feed- open seal water for short tym- close open and close desludgingwater

D shut operating water- stop feed- open and close desludging water quickly

206) Protection of zinc [rtective coating is good ata. 50 Deg. Cel . B. 65 c. 90 d 115

35)Which of the following option gives you the correct sequence of the metals/alloys in decreasingorder of preferential corrosion when all of themare bonded and immersed in an electrolyte?

A. Stainless Steel , Naval Brass , Aluminium bronze , Copper

B. AluminiumBronze ,Cupro-Nickel , Monel metal , Titanium

C. Stainless Steel ,Cupro-Nickel ,Naval Brassl , Monel Metal

D. Stainless Steel , Copper, Naval Brass , Aluminium bronze

55)After cleaning the M/E F.O. heater you have assembled the heater and want to try out theheater before putting into use. Which is the correct sequence of operation of the valves?


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A. (1) Vent valve open (2) F.O. inlet valve crack open (3) When F.O. starts coming out ofvent line close vent (4) F.O. inlet valve full open (5) F.O. outlet valve full open (6) Steamreturn and inlet valves slowly opened up B. (1) Vent valve open (2) F.O. outlet valve crack open (3) When F.O. starts coming out ofvent line close vent (4) F.O. outlet valve full open (5) F.O. inlet valve full open (6) Steamvalves slowly return and inlet opened upC. (1) F.O. outlet valve crack open (2) F.O. inlet valve crack open (3) As the pressuregauge shows pressure open steam heating valves slowly (4) Fully open F.O. inlet and outletvalvesD. (1) Open steam retur

58. You have started pumping out a Fore peak tank. The ballast pump is running showing a lowdischarge pressure but a positive suction pressure,Chief Engineer asks you to throttle the dischargevalve 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 ratedcapacityB. 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 ofthe discharge valve is a wrong practiceD. Centrifugal pumps cannot operate at greater than rated capacity, so throttling the discharge valveis only going to decrease the discharge rate below rated capacity

76.Sherardising ,Chromising and Calorising fall under which of the processes of metal coatingapplication :

A. Thermal spraying

B. Electroplating

C. Diffusion coating

D. Metal cladding

85)A submerged type centrifugal pump is sometimes used as the Main L.O. pump. Why is this? A. Flow rate required for Main L.O. systems are very high

B. The pressure required for Main L.O. system is high

C. It is a wrong design and such systems normally give problem

D. Both the pumps can be run together when the bearing temperatures are increasing

87. Which of the foll. Cannot b removed fr fuel oil by centrifugal in the purifier n micro filtration ? a. Sodiumb. Aluminium n siliconc. Vanadium d. Ash

113. Sea chest is to b cleaned n u found that the filter is stainless steel bucket type filter,Inside which there is a zinc anode. The purpose of anode is to __________ and should bElectrically _________ with filter body.

a. Stainless steel filter, isolatedb. Mild steel body, continuousc. Protect adjacent pipelines, continuous


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d. Seachest, isolated128. which of the foll. R true as far as painting of steel hull/structure is concerned?

a.Painting can b done under any wether conditionb. Painting can only b done after proper surface preparation is carried outc.painting should only b done on top of appropriate primer coating d.several coats of paint can b applied one after other without any time gap

129. 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 easyremoval 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 nutd.Hydraulic pressure need not b relieved during removal of jack

138)Cold and viscous lo of an aux engine is most likely to cause___

A sudden stopping of engine (pawa)

B difficulty in starting

C rhythmic knocking sound frm inside of engine

D drop in rpm of engine

141) Which of the following anodes of iccp can b used for comparatively higher current densities?

A zink

B high silicon iron

C lead silver

D platinized titanium

145)Which is biggest?

A NPSH

B NPSHA

C NPSHR

D TOTAL SUCTN HEAD

148) Which of the following valves are designed to have valve seats in pairs one facing the inlet sideand other facing outlet side within the vv body?

A butterfly vv

B ball vv

C globe vv


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D gate vv

152. The machinery which is usually tested first once the ship reaches a dry dock is

A. Engine room crane B.Engine room liftC.Gantry crane for engine room

D.All of the above

187) refer compr working continuously. Reason cud b

A insufficient condenser cooling

B air in the system

C leakage frm solenoid vv

D excessive refrigerant

29) The suction pressure gauge of the Engine room bilge pump is brokenand you don???t have a spare. Chief Engineer has asked you totroubleshoot the problem with Bilge pump not taking suction fromFwd.(P) bilge well. You try taking suction from Fwd. (S) & Aft Bilgewell and find that pump is taking good suction. Thereafter youtrysuction from Fwd. (P) bilge well for sometime after priming withSea Water but there is no change in level. You inspect the suctionfilter of the pump and find that it is very difficult to remove the same,you had to apply too much of force to lift the filter cover while

normally it comes out easily. What does it indicate? A. It does not indicate anything, sometimes the filter covers are difficult to remove.B. It indicates that the suction valve of the Fwd. Bilge Pump is leakingC. It indicates that the suction filter of the Fwd. (P) bilge well is clogged completely D. Pump suction filter might be clogged

191)The common term used for failure of metal and alloys in a corrosiveenvironment , when subject to high stresses is known as : majority

A. Fatigue failureB. Corrosion fatigueC. Stress corrosion crackingD. Fretting Corrosion

192)2 comprs shudnt b run in parallel because

A its not efficient

B it wil give overcapacity in the system

C there is possibility of loosing oil frm 1 compr to other

D a and b


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195) Sludge pump suction pressure is going full vacuum when u start the pumptaking water ofdouble bottom tank suction u hv checked the suction filter n found in clean condition. Taking suctionfr fuel oil sludge tank does not happen. Causes of the problem.

A) Pump is not working efficiently n reqd. overhaulingB) F>O> sludge tank suction valve is leaking C) W.O. tank D.B. tank suction pipeline has a blockage.D) Can ???say what is the problem but definiterly the pump needs tob opened up for overhaul

198) Not preventing cold corrosion in M/E component

a. Running Evy aat high loadb. J/W cooling temp. highc. High TNB cylinder oild. Cooling charge air in air cooler dew point

200) 18-The delivery rate of an axial piston hydraulic pump is controlled by varying the position ofthe _____________. tilting box slide block pintle reaction ring

213)with reference to data logger for a refer system which of the following parameters shud bmonitored?

A sw temp and pr

B condensing temp

C refrigerant leakage

D evaporating temp

215)in ac room ppl complained of being too cool the problem might b

A relative humidity high

B air velocity low

C heater failure to cut out at proper temp

D RH low

217) The process of depositing zinc on steel surfaces by diffusion coating is known as : A.SherardisingB. Chromising C.CalorisingD. Galvanising

222)Double entry impellers have advantage over single entry impeller. Wat is it?

A they balance out axial thrust


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B it gives a higher pumping efficiency

C it is cheaper and easier to manufacture

D the need of installing line brg onto the pp shaft is eliminated.

Correct Mep Ans

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