MEP Online

7/28/2019 MEP Online

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SET 1

Datsun FernandesM.E.P ONLINE QUESTIONS( ANY IDEA WHAT WILL BE CORRECT OPTIONS .waITING FOR UR COMMENTS DEAR FRIENDS)1. Which of the following V/V cannot be overhauled in place without removing piping?

A) BallValve (B) Diaphragm valveC) Globe valve (D) Butterfly valve

2. Copper tubing is used in refrigerant system becauseA) It has less internal resistanceB) It is cheaper compared to other materials.C) It is easier to check leaks in copper based systemD)None of the above

3 When pressure inside a system falls below that of the vapour pressure of the liquidCavities r formed, cavities travelling to high pressure region collapses releasingConsiderable energy damage the metal surface which is known as

A) Cavitation B) ErosionB) Impingment Corrosion D) Cavitation Erosion

4. While refloating the vessel after dry docking which of the following check should beCarried outA) Sounding of all double bottom tanksB) Checking leakages in theC) Checking leakagesD) Checking level of stern tube, header tanks

5. Pump start out motor gets overloaded or trip on overloadA) Alignment is wrongB) Gland packing too tight

C) Worn out/damaged ball bearingD) Cavitations existsE) All of the above

6. Why should only approved toilet cleaning chemicals be used inA) 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 operators

7) After ofver hauling reciprocal pump the motor connections were wrongly given.Determine outcome when pump is started?

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.

8) 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 piston not sure..
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B) High suction pressure actiong against the spring loaded clutching pistonC) Low discharge pressure acting against the spring loaded clutching pistonD) High discharge pressure acting against the spring loaded clutching piston9) The ballast valve of the fore peak tank is located in the duct keel n cannotbe opened or shut by remote operatio n. The valves of other tanks can boperated without any trouble which of the foll. wl b the best practice?

A) Valve should b checked locally for trouble shooting without which it is difficultto find the exact problem.B) The actuator must b defective n should b replaced with a new oneC) The control circuit is defective n PCB should b replaced.D) Shore assistance wl b reqd. in such cases.

10) U R responsible for daily transfers of engine room bilges . U follow thesequences aft fwd (P)-fwd(s) bilgewel n u hv never experienced a problembut 5/E started the transfer n first transferred forward (s) bilgewel nwithout any problem n u join him later u find that bilge pump is nottaking 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.B) fwd (s) Bilge wel suction valve is leakingC) Bilge pump suction filter cover gasket is leaking.D) Fwd (s) Bilgewel suction filter cover gasket is leaking.

11) The centrifugal pump r normallyA) Positive displacement typeB) RotodynamicC) Screw typeD)Gear type

12) Sludge pump suction pressure is going full vacuum when u start the pumptaking water of double bottom tank suction u hv checked the suction filtern found in clean condition. Taking suction fr fuel oil sludge tank does nothappen. Causes of the problem.

A) Pump is not working efficiently n reqd. overhaulingB) F>O> sludge tank suction valve is leakingC) 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

13. The difference between the discharges of a centrifugal pump n reci pumpthe discharge of centrifugal pump is ----------while that if reci is ---------

A) Turbulent, LaminarB) Intermittent continuousC) Continuous pulsatingD) Pulsating continuous

14) Which of the foll. is a true statementA) Aluminium wl b subject to preferential corrosion when in electricalcontinuity with stainless steel in presence of an electrolyte.b) Stainless steel wl b subject to preferential corrosion when in electricalcontinuity with mild steel in presence of an electrolyte.C) Copper wl b subject to preferential corrosion when in electrical


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continuity with stainlesssteel in presence of an electrolyted) Aluminium wl b subject to preferential corrosion when in electrical continuitywith zinc in presence of an electrolyte. Not sure

15. Ballast pump injection filter was cleaned n the pump was lined up it wasfound that there was some leakage in the suction filter suction. The pump

started n the leakage started. During deblasting it was found that the pumpcould not take ssuction fr one of the double bottoms. The cause could bA) Pump was drawing air fr.B) Pump was drawing air fr suction filterC) One of thepipelines on the suction side of the pump might be leakingD) The filter was not cleaned properly.16. The most imp. control measure to prevent boiler tube failure isA) Use of proper refractory mtrl.B) Proper maintenance of fuel burning equipmentC) Proper maintenance of boiler water conditionD) All of the above

17. When one of the M/E.F.O. heater is not in use thenA) The F.O. inlet n outlet valve should b kept shut, but steam heatingvalves 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 alsoshould 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.d) F.O. inlet n outlet valve should b kept shut while outlet valve should beleft open so that

17. The gland packing of centrifugal pump should hvA) Not allow any breakage under the suction pressure.B) Should only allow drop by drop continuous leakage under positive suctionpressure.C) Should allow considerable leakage

18. Corrosion of mild steel can b effectively prevented byA) Cathodic protectionB) Protective coatingsC) Addition of suitable alloying elements

19. U hv to dismantle a F.O. heater for cleaning . U hv closed both inletn outlet valves of the heater, both for F.O. n steam side. What wl U do beforeu start opening the heater?A) There is nothing more to b done, if u know the valves r holding u can straight away startopening 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 the heater.E) First open the vent valve n allow the heater to depressurize. N then open the drain valveto drain the contents of the heater.

20. Sequence of metal in the increasing order of noblety in galvanic seriesA) Stainless steel , Mild steel, Copper, ZincB) Copper, Stainless steel, Mild steel, Zinc.C) Zinc, Mild steel, Stainless steel, Copper.D) Zinc, Copper, Stainless steel, Mild steel.


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21. During flooding of dry dock foll. items must b verified?A) All sea valves are operationalB) All overboard discharge valves r operationalC) Stern tube seal r operationalD) All above

22. After removing all the bonnets n the securing nuts of a large globe valveit is found that the bonnet is coming out because of the strong adhensionof the gasket between the bonnet n the housing. What r u going to doin best practices.any idea dude??????????

ans to cupper tubing is c. is it rigt???? correct if wrong??????

Like

After some pages.. u can find lot of questions .. dont thinkthat questions are finsihed

o Datsun Fernandes ANS TO CUPPER TUBING IS C .IS IT RIGHT OPTION?????????

14 hours ago Like

o

Rohan Bhore 1-A, 2-D(NT SURE), 3-A, 4-D, 5-B, 7-A, 9-A, 10-B, 11-B, 13-C, 15-B, 16-C, 17-B, 18-C, 19-E, 21-D.....

Rohan Bhore no buttrrfly valve u cn open top cover n tk out ga plate valve n spindele bt nt in case of ballvale... u hav to take it out from da pipe...

Pratik Bansode 20-c

Harish Kumar d

Kshitij Ghildiyal 5 e.. ALL will cause pump 2 overload and trip at start up

5 hours ago Like 1

Datsun Fernandes R u sure and not 5b ,ghidiyal kshitij

Kshitij Ghildiyal yes.. check in any manual.. all the reasons are stated for pump overloading at start up..

Kshitij Ghildiyal 8 c

Vishal Kemburaj hey rohan... i think D is the ans for 1.. incase if the v/v is stuck in open position u cantable to remove... the only chance is to remove the piping....
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Kshitij Ghildiyal 14 d... as aluminum higher than zinc in the galvanic series... so it will be corroded by zincin an electrolytic solution

Arjun Harry 11- (B)

Kshitij Ghildiyal Arjun Harry drinking nd driving kya?? kabhi a toh kabhi b... laundon ko confuse karne kikoshish.. lol!!

Arjun Harry abey galti se (D) likh diya tha, ofcourse its (B) rotodynamic, all others r positive disp. p/p's !!!

Arjun Harry there r 2 Question 17 mentioned, i'm talking abt the first one17 - (A)Not 100% sure

Vishal Kemburaj 1-D,3-a,5-e,6-d,7-a,8-d,9-a,10-b,11-b,12-c,13-c,14-d,15-b,16-d,17-a,next is also 17 so fortat 17-b,20-c,21-d.....

Vishal Kemburaj actually in 19th ques, option c & d are same and option e & f are same

Arjun Harry for 19 it shd be both (E) & (F) as it is the continuation, correct me if i'm wrong !!!

Vishal Kemburaj for 22nd ques.. the ans is... try to close the valve disc further onto the seat by turning thehandwheel in osing direction so as to "jack up" the bonnet...

Vishal Kemburaj datsun... for 2nd i ll be d... im not sure...

Kshitij Ghildiyal 18 B ..as coating of either paint or zinc is used

SET 21-NPSH(npsha n npshr relation to avoid cavitation)

2-centrifugal pp dismantld widout marking hw to reassemble(3 ques on dis)1)if pp is single stage2)if pp is multisatge wid oppsite eye3)if pp is double entry impeller

3- brass/bronze/gunmetal composition

4- sherardising chromising clarising are methods of protection from corrosion by whichmethod,a)electroplating b)galvanisation c)metal diffusion d)cladding
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5- method of improving corrosion resistance of metal by adding chromium by metal diffusionis called___________

6-why metal cladding is bttr method of improving strength

7-galvanic series based quest (like arrange in increasing/decreasing order, study completeseries alloys ver also askd)

8-degree of motion Six degrees of freedom (6DoF ) refers to the freedom of movement of a rigid body in three-dimensional space . Specifically, the body is free to move forward/backward, up/down, left/right ( translation inthree perpendicular axes ) combined with rotation about three perpendicular axes, often termed pitch, yaw,and roll .

9-centrifugal fire pp #1 shows discharge pressure 5 bar bt no water on deck.u urself hasascertained dat all relevent valves r open n shut correctly.nw fire pp #2 started n water isdelivrd on dect with 2.5 bar pr on hydrant.wat iz wrong wid pp #1

10-trouble shooting question like bilge pp or sludge pp nt taking suction(3-4 ques)

11-purifier nt rotating wid desired rpm.reasonfrequency low/busbar vtg low/friction pads worn out

12-purifier leaking,bowl opened,cleaned n seal ring changed n put back bt still leaking watmight b wronghigh temp/high density/disc size nt proper/rpm low

13-hfo tfr pp was working efficiently. pp stopped nd started wen nxt tym no fuel deliverd,watmight b reason,head of 6m in tank present

14-which pp will delivr fluid in opposite direction, wen direction of rotation is reversd

15-ref plant short cycling reason

16-ref plant cmprsr running for longer tym.reason

17-air in ref plant reason
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18-moisture in ref plant,hw it is indicated

19-which pp used fr high speed application

20-vicosity of fuel oil used for ME was 145cst,new fuel comes whose vicosity was more danearlier,wat shud u doincrease temp setting/change setting of vicotherm/do nothing/open steam valve manuallymore

21-wat kind of corrosion if outlet of heat xchngr throttled n der is turbulence in HX

22-correct p'dure to open up HX for overhaul

23-correct p'dure fr sea chest opening up

24-frm whr ball vv leaks most of da tym

25-which vv is nt rotaing typeball/buttrfly/gate/plug

26-buutrfly vv stuck in half open position.hw to repaircant b taken out in open position frm line so try to close vv anyhow/apply hammer to shutit/remove pipeline nd do da overhaul/cannot b repaired onboard27-why copper tube is used ref plant

28-wat factors contribute to lower efficiency/low pr dvlpmnt in centrifugal pp

29-wat vil lead to overload trip in centrifugal ppworn brg/tight gland packing/cavitation

30-which of dem lead to failure of roller brg(mcq)misallingmnt/overload/overgrease/debris

31-sudden shut down of engine.reasonair in fuel/water in fuel/water in air filter


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32-use of synthetic polymer treatment limited to low pr blr.whydoes nt help in prevention of scale formation/does nt help in corrosion prevention/does ntform phosphate to tackel caustic embrtllmnt/all of above

Use of synthetic polymer treatment limited to low pressure boiler whyA-does not prevention of scale formationB- Does not help in corrosion preventionC- does not form phosphate to tackle causticD- all of d above

33-while stopping purifier abnormally vibrating,reason

34-impingement is which type of corrosion

35-why locking arrangement in butterfly vv

36-hw to use torque wrench(mcq) what is the correct procedure in tightening a torque spanner:(mcq)a. tightening beyond the cracking soundb.by using a addition length rodc.fluctuating loadd. none of the above

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

In which of the following types of refractory failure, softening of the refractory bricks takes place due to presenceof sodium/vanadium in fuel?A. SpallingB. CrackingC. Shrinkage crackingD. Slagging

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 isincreasing day by until it becomes 100% open to the cooler. The L.O. outlet temperature _______________ after theabove condition has reachedA. Starts decreasing immediatelyB. Starts increasing immediatelyC. Will be maintained at the set point of the temperature controllerD. Cannot be maintained at the set point and will increase slowly

Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium iselectroplated 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


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B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wearresistance and reduced friction to the steel surfacesC. Chromium plating is required for providing high glossiness and high hardness for better wear resistance andreduced friction to the steel surfaces and not for corrosion protectionD. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant

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

While refloating the vessel after dry docking which of the following check should beCarried outA) Sounding of all double bottom tanksB) Checking leakages in theC) Checking leakagesD) Checking level of stern tube, header tanks

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

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, sealingD. Gland packing, sealing

A multistage centrifugal pump is normally used

A. High headB. High discharge flowC. High viscous fluids

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

A. CathodisationB. Galvanisation


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C. NeutralisationD. Dezincification

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 hosec)Central priming system, attached vacuum pump, sea water primingd) None of the above

Which of the following can lead to premature failure of roller bearings?A. MisalignmentB. ContaminationC. ShrinkageD. Over greasing

Corrosion protection of steel surfaces by zinc coating can be carried out only at temperatures below 65 Deg. C . For highertemperatures :

A.Zinc reacts very fast and thus can only provide protection for a limited time

B.Zinc reacts with steel and protective layer vanishes due to chemical reaction

C.Steel may corrode preferentially to the zinc

D.Dezincification occurs leading to removal of zinc coating

Aluminium being lower than zinc in Galvanic series provides lesser protection to steel compared to the zinccoating . Which one of the following is a true statement :

A.Aluminium coating provides good corrosion protection compared that of zinc at elevated temperatures

B.Zinc is always preferred over aluminium coating irrespective of the temperature of metal surface

C.Aluminium is never used as coating material

D.Aluminium reacts with steel , so cannot be used for coating steel

The corrosion protection for Cooling Fresh Water systems of Marine Diesel Engines is normally provided by :

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

Which of the following V/V cannot be overhauled in place without removing piping?A) BallValve


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(B) Diaphragm valveC) Globe valve(D) Butterfly valve

Parameters to be monitored for data logger in a ref. system: room temperature, discharge temp, liquidline temp, evaporating pr, Condensing pr, sucn pipe nddisch. pr ,Hp& LP pr, Pump/fan operation, S.Wtemp &pr, Diff. oil pr, Ref.lekage, Defrost heating, Solenoid v/v operation.

In a positive displacement reciprocating pump, the use of the accumulator is to ????????????.

A.Steady the flow in the discharge section of the pipe.

B.Dampen the pressure surge on discharge side.

C. To always maintain a discharge head on the pump.

D.Both options A & B

A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and wasrenewed. 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 whenclosedB. Either a floating seat is pressed onto turnion supported ball by liquid pressure or floating ball is pressed onto theseatC. 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 sealingD. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat

viscosity of fuel oil used for ME was 145cst,new fuel comes whose viscosity was more than earlier, what should u doa) increase temp settingb) change setting of viscothermc) do nothingd) open steam valve manually more

20.To prevent oil from escaping into the sea when ballasting through the cargo piping system, you should FIRSTA.open sea suction valves, then start the cargo pumpB.start the cargo pump, then open sea suction valvesC.open block valves, then start the cargo pumpD.open sluice valves, then start the cargo pump

Which of the following statements is False about hydraulic jacks/tensioning tools?

A. The piston of the jack should be turned back by a certain degree after hand tightening to preventeasy removal after un tightening of the nut.B. The piston of the jack should not be turned back after hand tightening during un tightening of the


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nutC. The piston of the jack need not be turned back during tightening of the nut.D. The hydraulic pressure need not be relieved during removal of the jack.

Purifier leaking bowl opened, cleaned n seal ring changed n putback bt still leaking

wat might b wronga. high tempb. high densityc. disc size nt properd. rpm low

It is given that engine room bilge pump has suction manifold on which 3 valves are located.One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction andthe third one is for sea water suction. It is found that the Bilge pump is unable to takesuction from any of the bilge wells, but is able to take suction efficiently from Bilge tank.

What is the most probable cause?A. Pump suction filter cover gasket leakingB. Suction filter cover gasket of one of the Bilge wells is leakingC. Bilge well suction pipeline leaking between individual bilge well valves and suctionmanifold valveD. Bilge pump suction pipeline leaking between the manifold and the pump

Which of the following is a true statement (single choice)A) Aluminium 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 steel inpresence of an electrolyte.C) Copper will be subject to preferential corrosion when in electrical continuity with stainless steel inpresence of an electrolyted) Aluminium will be subject to preferential corrosion when in electrical continuity with zinc in presenceof an electrolyte.

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 dissipateheat generatedB. 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.

The de.livery rate of an axial piston hydraulic pump is controlled by varying the position of the _____________.1. Tilting box2. Slide block3. Pintle4. Reaction ring


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Who gives hotwork permit on drydock C.e. 2.e Supertnt Dock engrs

37-suction lift n suction head in centrifugal pp----------------------------------------------------------------------------------------------------------------------------------------

SET 31.During flooding of a drydock the following items must be verified(all sea vvs r oprtnl,all

ovbd dschg vvs r oprtnl,stern tube seal r oprtnl,ALL THE ABOVE)

2.U hav 2 dsmntla F.O heatr 4 cleanin.U hav closed both the inlet n outlet vvs of theheater,both 4 f.o n steam side.What will u do b4 start opening up the heater(answer-1stopen the vent vv n allow d heatr to depressurize n thn open the drain vv to drain thecontents of the heater)

3.U must have used reinforced rubber joints.The reinforcement is normally provided usingnon asbestos fibres.the reinforcement is provided coz(answer-to increase the load carryingcapacity of joint so it can withstand higher pressures , to increase the temp resistance of the

joint)

4.The size of the solid particle contaminants in hydrlic sys is measured in( millimetrecubed,nano mm,MICRONS,micro mm)

5.With ref to centrifugal pp chrcteritics curves,wot ll b the effect wen pp is strtd a-withsuction vv shut n b-with dschg vv shut(WITH SUCTION VV SHUT BOTH HEAD H N FLOW RATEQ WILL BE ZERO AND WITH DISCHARGE VV SHUT FLOW RATE Q WILL B 0 N HEAD H WILL BE@ MAXIMUM HEIGHT,with suction vv shut H wiill be 0 n flow rate Q will be minimum n withdschg vv shut flow rate Q will b 0 n head H will b @ minimum height,with suction vv shutboth head H n flow rate Q will b 0 n with dischg vv shut flow rate Q will b minimum n head Hwill be at minimum height,none of the above,all of the above)

6.which of the following optiongives u the correct sequence of the metals in increasing orderof nobility in galvanic series(stainless steel,ms,cu,zn/cu,ss,ms,zn/ZN,MS,SS,CU/zn,cu,ss,ms)

7.The most important control measure to prevent tube failure is {use of proper refractorymateerial,proper maintanance of fuel burning equipment,proper maintainance of boiler


14/49

water condition,ALL OF THE ABOVE}

8.When 1 of the M.E F.O heater is not in use then{THE FUEL OIL INLET N OUTLET VALVESSHD B KEPT SHUT BUT STEAM HEATING VVS SHD BE CRACKED OPEN,SO AS TO KEEP THEHEATER WARM/ F.O inlet n outlet vvs shd b kept shut steam heating vvs also completelyshut and heater shd be drained of any remaining f.o/f.o inlet n outlet vvs shd be kept crackopen so tht the f.o recirculation through the heater can take place/f.o inlet vv shd be keptshut while the outlet vv shd be left open,so tht heater can be put into use as fast as possiblein case required}

9.While refloating the vessel after dry dock,which of the following checks shd be carried out?{SOUNDING OF ALL DOUBLE BOTTOM TANKS ,CHECKING LEAKAGES IN THE STERN TUBEHEADER TANKS,CHECKING LEAKAGES AT SHIP SIDE VVS,CHECKING LEVELS OF STERN TUBEHEADER TANKS}10.Which of the following will be the correct way of using a torque wrench{application of

jerk pulls while tightenin,using an extension,tightng beyond the charectristic clicksound,NONE OF THE ABOVE}

1) BILGE PUMP TAKING SUCTION FROM BILGE TANK BUT NOT TAKING FROM BILGE WELL TELL THE REASON

2) CARGO OIL PUMP RPM REDUCES WHILE STRIPPING WHY..???

3) WEAR RING LOCATED IN CENTRIFUGAL PUMP___________

4) WHAT IS PROVIDED TO AVOID LEAKAGE BETWEEN BEARING AND GLAND PACKING OFCENTRIFUGAL PUMP???

5) FUEL OIL HEATER REPAIRING PROCEDURE

6) MAIN ENGINE BEARING BOTTOM HALF REMOVAL PROCEDURE

7) VESSEL IS AT DRYDOCK , WHO ISSUE HOT WORK PERMIT??? Options were CE, 2E,shipyard engineer, or ship superitendendent..

8) WHICH PROCESS IS NOT DONE ON MILD STEEL ..???? options were hot plating,electrolysis, explosion bonding, metal spraying

9) AIR COMPRESSOR AIR COOLER TYPE???options were spring type, floating type, fixedtube , u tube..


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10) Some questions were on corrosion and from galvanic series material

SET 4

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 withclean water

D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing withclean water

Which of the following statements about pipe repairs is true?

A. A very small hole in a pipe does not necessitate permanent repair by way of renewal of section

B. Welded doublers are acceptable as permanent repairs.

C. Permanent repairs can only be done by using classification society approvedmaterial

D. None of the above


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A ballast pump is being used to deballast a fore peak tank which is full. It is seenthat suction pressure is positive and discharge pressure is very low compared torated discharge head. It indicates that:

A. Pump is not operating satisfactorily and pumping capacity is too low

B. Pump is not operating satisfactorily and pumping capacity is higher than rated,throttling of discharge valve is required

C. Pumping capacity is not affected by suction and discharge pressures

D. Pump is operating normally

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

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

A. Bimetallic corrosion


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B. Selective phase corrosion

C. Erosion

D. Impingement corrosion

The water from discharge side of the a centrifugal pump is supplied as sealing waterto the stuffing box for the pump shaft at:

A. Sealing ring

B. Shaft sleeve

C. Lantern ring

D. Neck bush

Process of enrichment of surface of steel and and steel alloys by zinc usingElectroplating is known as

A. Cathodisation

B. Galvanisation

C. Neutralisation


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D. Dezincification






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

A. Misalignment

B. Contamination

C. Shrinkage

D. Over greasing


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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

Which of the following would be the correct way(s) of using a torque wrench?

A. Application of jerk pulls while tightening

B. Using an extension

C. Tightening beyond the characteristic clicking sound


Screw pump is generally are ??????????????? pump

A. Slow speed

B. High speed


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C. Medium speed

D. All of the above

Which of the following will be required to be done in order to reduce sulphurcorrosion 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

Which of the following is used as Anode for ICCP system:

A. Zinc

B. Copper

C. Aluminium

D. Platinised Titanium


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

A. Misalignment

B. Contamination

C. Shrinkage

D. Over greasing

It is given that engine room bilge pump has suction manifold on which 3 valves arelocated. One valve for the 3 engine room bilge wells suction, another one for Bilgetank suction and the third one will be for ______________.

A. Fresh water suction

B. Cargo hold bilge suction

C. Sea water suction

D. Waste Oil tank suction


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Pump driven clutch type attached vacuum pumps are commonly used for primingballast pumps and emergency fire pumps. What is the factor which clutches thevacuum pump clutch to the pump clutch during start of the pump?

A. Low suction pressure acting against the spring loaded clutching piston

B. High suction pressure acting against the spring loaded clutching piston

C. Low discharge pressure acting against the spring loaded clutching piston

D. High discharge pressure acting against the spring loaded clutching piston

After O'Hauling pumps, pumps cannot be turned freely by hand, the possible causecould be

A. Uneven tightness of the casing Nuts

B. Gasket between the casing too thin

C. Big clearance between the wear Ring

D. Only A

E. A and B


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F. A and C






Pump driven clutch type attached vacuum pumps are commonly used for priming

ballast pumps and emergency fire pumps. What is the factor which clutches thevacuum pump clutch to the pump clutch during start of the pump?

A. Low suction pressure acting against the spring loaded clutching piston

B. High suction pressure acting against the spring loaded clutching piston

C. Low discharge pressure acting against the spring loaded clutching piston (notsure)

D. High discharge pressure acting against the spring loaded clutching piston


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If the direction of rotation of a gear pump is reversed due to change in-phasesequence, 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

resistance testing should be ideally done on electrical equipment when theequipment is:

A. Cold

B. Hot or at working temperature

C. In operation

D. At part load

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

A. Pressure jet type (no)


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B. Spinning cup burner

C. Spill type burner

D. Y-jet type burner

Sherardising , Chromising and Calorising fall under which of the processes of metalcoating application :

A. Thermal spraying

B. Electroplating

C. Diffusion coating

D. Metal cladding

Resistance to corrosion of Aluminium alloys is due to :

A. Aluminium being a very noble metal when compared to other metals inElectrochemical 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


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D. All of the above.

All other conditions remaining constant, when centrifugal pump is changed over forpumping a liquid of higher specific gravity, the discharge head of the pump at therated capacity will

A. increase

B. decrease

C. Remain same

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





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D. Only A

E. A and B

F. A and C

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 withclean water

D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing withclean water

Which of the following can lead to sudden stopping of a diesel engine?

A. Air in fuel supply line

B. Water in fuel supply line

C. Obstruction in air filter


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D. Water in the air filter

Which of the following statements about pipe repairs is true?

A. A very small hole in a pipe does not necessitate permanent repair by way of renewal of section

B. Welded doublers are acceptable as permanent repairs.

C. Permanent repairs can only be done by using classification society approved

material







A ball valve is found leaking in service and needs to be overhauled.What type of repairs can be carried out?


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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

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

A. Bimetallic corrosion

B. Selective phase corrosion

C. Erosion

D. Impingement corrosion

The water from discharge side of the a centrifugal pump is supplied as sealing waterto the stuffing box for the pump shaft at:

A. Sealing ring


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B. Shaft sleeve

C. Lantern ring

D. Neck bush

Process of enrichment of surface of steel and and steel alloys by zinc usingElectroplating is known as

A. Cathodisation

B. Galvanisation (to prevent rusting)

C. Neutralisation

D. Dezincification






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D. All of the above

Which of the following is used as Anode for ICCP system:

A. Zinc

B. Copper

C. Aluminium

D. Platinised Titanium





D. All of the above

The process of depositing chromium on to steel surfaces by diffusion coating isknown as :


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A. Galvanising

B. Chromising

C. Calorising

D. Coppering








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D. Only A

E. A and B

F. A and C

Centrifugal pumps cannot handle air and require priming.But you are aware thatcentrifugal which on the same principal can handle air very well. Which twoproperties of air are responsible because of which the centrifugal pumps cannothandle air:-

A. Fluidity only

B. Density only

C. Both fluidity and density

D. Compressibility

For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W.temperaturethrough the cooler has decreased from 12 deg. C to 7 deg. C over a period of time,


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while the drop in temperature of L.O. across the cooler has also decreased.All othercoolers have been reported to be working normal & M/E is also running at aconstant load in calm weather.What is the inference drawn by decrease in thetemperature 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

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

When centrifugal pump is changed over for pumping a liquid of higher specificgravity which of the following is going to change?

A. Discharge pressure


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B. Discharge head

C. Power consumption

D. Pump speed

It is given that engine room bilge pump has suction manifold on which 3 valves arelocated. One valve for the 3 engine room bilge wells suction, another one for Bilge

tank suction and the third one is for sea water suction. It is found that the Bilgepump is unable to take suction from any of the bilge wells, but is able to takesuction efficiently from Bilge tank. What is the most probable cause?

A. Pump suction filter cover gasket leaking

B. Suction filter cover gasket of one of the Bilge wells is leaking

C. Bilge well suction pipeline leaking between individual bilge well valves andsuction manifold valve

D. Bilge pump suction pipeline leaking between the manifold and the pump

Sherardising , Chromising and Calorising fall under which of the processes of metalcoating application :

A. Thermal spraying


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B. Electroplating

C. Diffusion coating

D. Metal cladding






SET 5

1. Study the galvanic series from noble end to baseend,depending on this 3 ques are coming

2. Purpose of Sacrificial anodes

3. Composition of Brass,Bronze,Aluminium Bronze

4. Weight of rudder acts on

5. Rudder clearance can be measured by

6. What is jumping clearance


37/49

7. Reasons for engine sudden stop

8. What is Galvanising

9. When zinc is added to mild steel , what happens10.Type of tubes in cooler of air compressor

11. What is NPSH & Static suction head

12. Why do we do the priming for centrifugal pump

13.Cavitation means

14. Direction of a gear pump depends on prime mover15. During maintenance of FO heater, all valves areclosed then how do we open the heater(ans:open purgev/v to depressurise,drain the fuel in it)

16. Function of Thermostatic v/v in refer in terms if latent heat

17. Depending on specific gravity of two fluids,whichone has high discharge pressure for the pump of usingthe two different fluids

18. Types of tubes in refer cooler(i.e. (a)straight tube(b) u tube

(c)coil tube (d)spring tube

19.For ME LO P/P, centrifugal type is used, why

20. Why globe v/v is used,gate v/v is used

21. In bilge line, discharge line goes to where(whetheroverboard or shore connection or OWS)


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22. If any problem in 15 ppm monitor while dischargingthrough OWS, what do we do

NOTE:IN EVERY PAPER USCG QUES ARE 10-12; INMOTOR & GEN,5-7Q FROM BOILERS;FROMREFRIGERATION SYSTEM,2-3QUES IN EVERY PAPER;INMEP,FROM CORROSION,3-4QUES;IN SAFETY,10Q FROMANNEX-1;IN MOTOR,3-4Q FROM T/C AND ITSCHARACTERISTIC CURVES

---------------------------------------------------------------------------------------------------------------------

--------------------- SET 6

You have seen and operated several valves onboard ships. All the butterflyvalve operation handles are operated by a locking arrangement because:

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

B.Butterfly valve does have a spindle packing but same cannot be excessivelytightened to have good grip on the spindle to prevent it from opening againstvibration

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

D. All the butterfly valves do not have locking arrangement as there is no suchrequirement for the sameWhich of the group of method are used for pri ming of centrifugal pumps

onboard ships?

A. Gravity tank, attached vacuum pump

B. Attached Vacuum pump, filling pump casing using a fresh waterhose

C. Central priming system, attached vacuum pump, sea waterprimingD. None of the aboveWhich one of the following is a type of corrosion :-


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A. ElectroplatingB. GalvanisationC. Graphitisation

D. Demulsification The size of solid particle contaminants in hydraulic systems is measured in: A. Millimeter cubedB. Nano-millimeterC. MicronsD. Micro millimeterPump Start But Motor gets overloaded or Trip on overload.

A. Alignment is wrongB. Gland packing too tightC. Worn out / Damaged ball bearingD. Cavitations existsE. All of the above

Which of the following instruments measures propeller drop? A. Poker GaugeB. Telescopic feeler gaugeC. TrammelD. Propeller drop gaugeWhich 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 rateB. Using high TBN cylinder oil

C. Increasing scavenge air temperatureD. Decreasing cylinder oil feed rate Your ship has a OWS and reciprocating bilge pump of capacity 2.0 m3 /hr. Ittakes about 12 hours to pump out the complete bilge tank through OWS. Theship is going to dry-dock and Chief Engineer is recommending company toinstall a centrifugal pump of 10 m3 capacity which will take the same space andcan pump out the bilge tank only in 2.5 hrs. The company should:


40/49

A. Accept the proposal as a centrifugal pump has several advantagesover a reciprocating pump

B. There is no question of accepting a centrifugal pump as a Engineroom bilge pumpC. Propose to fix a Gear pump instead of a centrifugal pump

D. Pipelines and pumps once designed cannot be changed as theyare class approvedNormally so called ???single screw pumps??? are used as sludge pumps in

engine room. What is the correct technical name of these pumps? A. Snake PumpB. Screw PumpC. Progressive cavity pumpD. Gerotor Pump

In a Parallel-Gate type valve the sealing between the valve and the disc isprovided by: A. Appropriate tightening torque of the valve spindle

B. Gate and valve seat have a taper and when tightened they willseal against each other

C.Either the seat or the disc Gate are free-floating, allowingupstream pressure to seal the seat and disc against any unwantedleakage

D. For a gate type valve the sealing is never perfect and they always

allow some leakage The crank web deflection readings of a diesel engine would be erroneous inwhich of the following conditions?

A. When the draught of the vessel has changed while readings werebeing takenB. When cargo loading and discharging has been too rapid

C. When the crankcase temperature has changed substantiallyduring the process of taking the readings.D. None of the above

The purpose of an evaporator in the domestic refrigeration system is to

A. Transmit latent heat of evaporationB. Absorb latent heat of fusionC. Absorb latent heat of evaporationD. Transmit latent heat of fusionIf the direction of rotation of a gear pump is reversed due to change in-phase


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sequence, what happens when the pump is started? A. Direction of flow remains the sameB. The pump will get damaged due to overpressure on suction sideC. Pump relief valve will be liftedD. The direction of flow will be reversedSludge pump suction pressure is going into full vacuum when you start the

pump taking Waste oil D.B. tank suction. You have checked the suction filterand it is found in clean condition.Taking suction from F.O. sludge tank doesn???tpose any problem. What could be the most probable cause? A. Pump is not working efficiently & requires overhaulingB. F.O. sludge tank suction valve is leakingC. W.O. tank D.B. tank suction pipeline has a blockage

D. Can???t say what is the problem but definitely the pump needs tobe opened up for overhaulWhich of the following can lead to sudden stopping of a diesel engine?

A. Air in fuel supply lineB. Water in fuel supply lineC. Obstruction in air filterD. Water in the air filtercentrifugal pump will typically give you a low flow rate at alower pressure, where a piston pump will give you more

pressure and higher flow rate. Is the statement correct? A. TRUEB. FALSEC. First Sentence is right. Second one is wrongD. I Don't knowWhich of the following is an important requirement for proper functioning of

sacrificial anode system :- A. Good Insulation between anodes and ship???s hullB. Good electrical continuity between anodes and ship???s hull

C. Providing protection of anodes from being painted over during hullpaintingD. Presence of an insulating material between anode and the cathode 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


42/49

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 dischargerate is lesser

D.Reciprocating pumps are only available in high capacities and forsmaller capacities only gear pumps can be used

Which of the following types of damages are metal seatings of a valve subjectto?Choose the correct alternative. A. Corrosion, Erosion, Abrasion, DeformationB. Corrosion, Fatigue failure, brittle fracture, caustic crackingC. Erosion, caustic cracking, brittle fracture, CloverleafingD. None of the aboveIt 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) & aftbilge wells. What could be the most probable cause?

A. There is leakage in the bilge suction pipeline somewhere betweenthe bilge wells and bilge pumpB. The Fwd. (P) bilge well suction valve might be leakingC. The Fwd. (P) bilge well suction filter cover gasket might be leakingD. The pump needs to be overhauled You are pumping out sludge to a shore facility using your sludge pump. Youfind that the discharge rate of pump is very slow and suction filter is gettingclogged frequently.What is the best alternative 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 suctionpressure and clean the filter as soon as it drops

C. As soon as the as the shore facility tells you that they are notreceiving any sludge, you stop 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 andyou can get a better discharge rate

When centrifugal pump is used to pump a liquid of higher specific gravity thepump Power will A. increaseB. decrease

C. Will not be affected as the pump power depends only on the flowcapacityD. None of the above


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The process of depositing zinc on steel surfaces by diffusion coating is knownas : A. SherardisingB. ChromisingC. CalorisingD. GalvanisingBy which of the following is the attached vacuum pump of a ballast pump is

driven? A. Electrical motorB. Hydraulic motorC. Pump driven clutchD. Pneumatically driven

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

High tensile steels are : A. High carbon steels with suitably added alloying elementsB. Medium carbon steels with suitably added alloying elementsC. Low carbon steels with suitably added alloying elementsD. None of the aboveA drain cooler is provided with S.W. cooling. What is the best way to increase

the temperature of condensate draining to the hotwell? A. Throttle the S.W. inlet valve

B. Throttle the S.W. outlet valveC. Open the condensate Bypass to the coolerD. Close the condensate bypass to the coolerAfter 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? A. You can open the filter inlet and outlet valves & directly start


44/49

using the filter

B. If you do not want to use the sea chest in question, you need notworry and you can open the valves when required

C.Sea Water inlet valve should be crack opened, the filter bodyshould be purged, any leakages and thereafter filter can be keptisolated or used as required

D. You will close the other side sea chest valves first and then openthis side sea chest filter inlet and outlet valves You must have used reinforced rubber joints. The reinforcement is normallyprovided using non-asbestos fibres. The reinforcement is provided because

A. Ordinary rubber gasket have a porous matrix, having capillarieswhich can allow liquid leakage when subjected to high pressure

B. To increase the load carrying capacity of joint so it can withstandhigher pressuresC. To increase the temperature resistance of the jointD. To protect the joints from fire or other accidental damageCorrosion protection of steel surfaces by zinc coating can be carried out only at

temperatures below 65 Deg. C . For higher temperatures :

A. Zinc reacts very fast and thus can only provide protection for alimited time

B. Zinc reacts with steel and protective layer vanishes due tochemical reactionC. Steel may corrode preferentially to the zincD. Dezincification occurs leading to removal of zinc coatingWhich of the following valves cannot prevent backflow of liquid in a pipeline?

A. Gate valveB. Globe Check ValveC. Swing Check ValveD. Angle check valveMost 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 valveB. Renew the trapC. Lap the disc and the seat of the trapD. Throttle the steam inlet valveWhich of the following option gives you the correct sequence of the metals in

decreasing order of preferential corrosion when all of them are bonded and


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immersed in an electrolyte ? A. Titanium, Mild Steel , Zinc , Stainless steelB. Titanium , Stainless steel ,Mild Steel ,ZincC. Zinc , Mild Steel , Stainless steel , TitaniumD. Zinc , Titanium , Mild Steel , Stainless steelBronze is an alloy typically consisting of :-

A. Copper , lead & tinB. Copper , Zinc & leadC. Copper , Zinc & TinD. Copper , Tin & LeadIn a positive displacement reciprocating pump, the use of theaccumulator is to ????????????. A. Steady the flow in the discharge section of the pipe.B. Dampen the pressure surge on discharge side.C. To always maintain a discharge head on the pump.D. Both options A & B The process of depositing chromium on to steel surfaces by diffusion coating isknown as : A. Galvanising

B. ChromisingC. CalorisingD. CopperingWhen running TWO centrifugal Pumps in parallel, Flow rate"Q"is increased.

A. TRUEB. FalseC. May Be

D. I Don't knowA refrigerant compressor will run continuously when there is A. Too heavy cooling load on the systemB. Air in the systemC. Insufficient refrigerant in the systemD. Any of the above


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You have started pumping out a Fore peak tank. The ballast pump is runningshowing a low discharge pressure but a positive suction pressure,Chief Engineerasks you to throttle the discharge valve to increase the back pressure on thepump. 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 andwill finish sooner than expected

C. It is a misconception that pumps operate smoothly at increased back pressure andthrottling of the discharge valve is a wrong practice

D. Centrifugal pumps cannot operate at greater than rated capacity, so throttling thedischarge valve is only going to decrease the discharge rate below rated capacity You have overhauled a centrifugal pump and while assembling forgot to installthe o-ring between the sleeve (provided in way of gland packing) and the shaft.What impact does this have? A. It will not affect the pump in any way

B. It will cause leakage of fluid(air/water) in between the shaft andthe sleeve and will affect the pump performance

C. It will not affect the pump performance n any way but will corrodethe shaft between the o-ring and shaftD. It will cause dynamic imbalance of the shaftWhich of the following types of boiler burners have maximum turn down ratio?

A. Pressure jet typeB. Spinning cup burnerC. Spill type burnerD. Y-jet type burnerCopper tubing is used in Refrigerant system because

A. It has less internal resistanceB. It is cheaper compared to other materialsC. It is easier to check leaks in copper based system

D. None of the aboveWhich of the following is a true statement ? (choose more than one option if true)

A.Mild steel will be subject to preferential corrosion when inelectrical continuity with stainless steel in presence of anelectrolyte

B. Stainless steel will be subject to preferential corrosion when inelectrical continuity with Mild steel in presence of an electrolyte


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C. Copper will be subject to preferential corrosion when in electricalcontinuity with Mild steel in presence of an electrolyte

D. Zinc will be subject to preferential corrosion when in electricalcontinuity with Aluminium in presence of an electrolyteF.O. transfer pump was working efficiently, but it stopped taking suction

suddenly. There is a sounding of 6.0 m in the F.O. deep tank. The suctionpressure gauge was renewed recently and is showing a positive pressurewhenpump is running, but Pump is not transferring any F.O. What is the mostprobable cause? A. Pump is damaged and needs overhaulB. Suction filter cover gasket might leakingC. Pump relief valve might be leakingD. The pump suction pipeline is blockedMotor stator winding badly contaminated by dirt, oil and grease should be

cleaned by: A. High pressure compressed airB. Suction or vacuum cleaningC. Brushing, spraying or immersion in an approved cleaning solventD. Immersion in fresh water followed by dryingAluminium being lower than zinc in Galvanic series provides lesser protection

to steel compared to the zinc coating . Which one of the following is a truestatement :

A. Aluminium coating provides good corrosion protection comparedthat of zinc at elevated temperatures

B. Zinc is always preferred over aluminium coating irrespective of the temperature of metal surfaceC. Aluminium is never used as coating materialD. Aluminium reacts with steel , so cannot be used for coating steelWhich of the following statements is False about hydraulic jacks/tensioning

tools?

A.The piston of the jack should be turned back by a certain degreeafter hand tightening to prevent easy removal after un tighteningof the nut.

B. The piston of the jack should not be turned back after handtightening during un tightening of the nut

C. The piston of the jack need not be turned back during tighteningof the nut.D. The hydraulic pressure need not be relieved during removal of the


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jackWhich of the following can lead to premature failure of roller bearings?

A. MisalignmentB. ContaminationC. ShrinkageD. Over greasingWhich of the following is NOT a true statement?

A. Butterfly valves are used for modulating flow and can be throttledB. Globe Valves can be straight flow or angle flow type

C. Swing check valve will provide lesser resistance than same borediameter globe type check valve

D. In a globe type valves, mechanical seals are used for providing

sealing between the valve bonnet and the spindleQuestion 7Which of the following valves are designed to have valve seat in pairs - one facing the inlet side and the other facing theoutlet side within the valve body?A. Butterfly valveB. Ball ValveC. Globe ValveD. Gate Valve 7D,8C,9B,10D,11B,12C

*Question 8 The size of solid particle contaminants in hydraulic systems is measured in:A. Millimeter cubedB. Nano-millimeterC. MicronsD. Micro millimeter

*Question 9In Impressed Current Cathodic protection system , the current for cathodic protection is supplied by :A. Use of sacrificial anodesB. A low voltage D.C. supplyC. A low voltage A.C. supplyD. 110 V A.C. supply

Question 10Which of the following can lead to short cycling or frequent cutting in and cutting out of a fridge compressor?A. Dirty condenserB. Air entrapped in refrigerantC. High cooling water temperatureD. Grossly insufficient charge

*Question 11 The attached vacuum pump of a ballast pump operates on the principle of a:A. Centrifugal pumpB. Reciprocating pumpC. Gear PumpD. Vane Pump

Question 12After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the followingis the best alternative?A. You can open the filter inlet and outlet valves & directly start using the filter


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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 bekept 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 outlet valves

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