MEP ONLINE QUESTIONS

Question 1After maintaining correct discharge pressure , soon ceases to discharge water what are possible cause?A. Pressure gauge wrongB. Pump sucking airC. Discharge valve throttledD. Casing wear ring is worn

Question 2Which of the following can lead to premature failure of roller bearings?A. Misalignment (1)B. Contamination (2)C. ShrinkageD. Over greasing (3)

Question 3 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

*Question 4Increasing the rotational speed of a cargo pump the pump flow rate will:A. Increase in direct proportion to the increase in speedB. Decrease in direct proportion to the increase in speedC. Flow rate doesn???t depend upon speedD. Flow

Question 5 The flow rate through a F.O. transfer pump will not be affected by which of the following factors?A. Low F.O. temperatureB. Low sounding in F.O. tankC. Internal leakage within the pumpD. Leaking discharge valveQuestion 6(MCQ) Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :-A. Increasing cylinder oil feed rateB. Using high TBN cylinder oilC. Increasing scavenge air temperatureD. Decreasing cylinder oil feed rate

Question 7Which of the following valves are designed to have valve seat in pairs - one facing the inlet side and the other facing the outlet side within the valve body?A. Butterfly valveB. Ball ValveC. Globe ValveD. Gate Valve

*Question8The 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 11The 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 following is the best alternative?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 the valves when requiredC. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and thereafter filter can be kept isolated or used as requiredD. You will close the other side sea chest valves first and then open this side sea chest filter inlet and outlet valves

*Question 13The suction pressure gauge of the Engine room bilge pump is broken and you dont have a spare. Chief Engineer has asked you to troubleshoot the problem with Bilge pump not taking suction from Fwd (P) bilge well. You try taking suction from Fwd (S) & Aft Bilge well and find that pump is taking good suction. Thereafter you try suction from Fwd. (P) bilge well for sometime after priming with Sea Water but there is no change in level. You inspect the suction filter 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 completelyD. Pump suction filter might be clogged

*Question 14Process of enrichment of surface of steel and and steel alloys by zinc using Electroplating is known asA. CathodisationB. GalvanisationC. NeutralisationD. Dezincification

Question 15Which of the following statements is False about cleanliness of electric motors?A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat 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.

*Question 16In a Parallel-Gate type valve the sealing between the valve and the disc is provided by:A. Appropriate tightening torque of the valve spindleB. Gate and valve seat have a taper and when tightened they will seal against each otherC. Either the seat or the disc Gate are free-floating, allowing upstream pressure to seal the seat and disc against any unwanted leakageD. For a gate type valve the sealing is never perfect and they always allow some leakage

*Question 17Which of the following instruments is used to measure rudder carrier bearing wear down?A. Poker gaugeB. Telescopic feeler gaugeC. Depth gaugeD. Trammel

Question 18A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closedB. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seatC. 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

Question 19In case of tankers, the speed of cargo pumps is reduced while stripping, why?A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reducedB. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reducedC. To prevent the pump from overspeeding if it loses suctionD. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo

Question 20The purpose of an evaporator in the domestic refrigeration system is toA. Transmit latent heat of evaporationB. Absorb latent heat of fusionC. Absorb latent heat of evaporationD. Transmit latent heat of fusion

*Question 21Which 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 filter

Question 22Which of the following is an important requirement for proper functioning of sacrificial anode system :-A. Good Insulation between anodes and ships hullB. Good electrical continuity between anodes and ships hullC. Providing protection of anodes from being painted over during hull paintingD. Presence of an insulating material between anode and the cathode

Question 23:A thin layer of electrolyte trapped in a small pits on a metal surface , and remaining stagnant over a period of time , may cause :A. ErosionB. Bimetallic corrosionC. Crevice corrosionD. Corrosion fatigue

Question 24 :Normally so called ???single screw pumps??? are used as sludge pumps in engine room. What is the correct technical name of these pumps?A. Snake PumpB. Screw PumpC. Progressive cavity pumpD. Gerotor Pump

*Question 25 :Sherardising , Chromising and Calorising fall under which of the processes of metal coating application :A. Thermal sprayingB. ElectroplatingC. Diffusion coatingD. Metal cladding

Question 26In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?A. SpallingB. CrackingC. Shrinkage crackingD. Slagging

Question 27In a Sea Water cooled J.C.W. cooler, the most common cause for loss in cooling efficiency of the heater is:A. Scale formation on J.C.W. sideB. Mud/silt deposits on J.C.W. sideC. Scale formation on S.W. sideD. None of the above

Question 28 You have to dismantle a F.O. heater for cleaning. You have closed both the inlet and outlet valves of the heater, both for F.O. & steam side. What will you do before you start opening up the heater?A. There is nothing more to be done, if you know the valves are holding you can straight away start opening the heater without wasting timeB. Drain the heater till pressure gauge reads zero and then start opening the heaterC. Drain the heater till F.O. stops coming out of the drain and then start opening the heaterD. First open the vent valve and allow the heater to de-pressurize and then open the drain valve to drain the contents of the heater

Question 29When running TWO centrifugal Pumps in parallel, Flow rate"Q" is increased.A. TRUEB. FalseC. May BeD. I Don't know

Question 30 Surface preparation of steel surfaces , prior carrying out painting is important because (choose the best alternative) :A. Any rust and contaminant inclusions may cause local paint film breakdownB. 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 causes strong bonding

Question 31Cadmium coatings provide corrosion protection . Cadmium coatings are commercially carried out using which of the following methods :-A. Metal SprayingB. Electro-platingC. Hot-dippingD. Metal diffusion

*Question 32During flooding of a dry dock the following items must be verifiedA. All sea valves are operationalB. All overboard discharge valves are operationalC. Stern tube seal are operationalD. All of the above

Question 33 The machinery which is usually tested first once the ship reaches a dry dock isA. Engine room craneB. Engine room liftC. Gantry crane for engine roomD. All of the above

Question 34The 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

Question 35 Pump 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

*Question 36The function of an accumulator on the discharge side of a reciprocating bilge pump is to:A. Supply liquid even when the pump is not runningB. 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

Question 37 A recently completely overhauled Engine room bilge pump was working efficiently. Suddenly one day you find that the pump is not taking suction. You have tried priming with sea but still the pump doesnt take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative.A. The bucket rings have worn 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 might have lodged itself in between the valve and the seatD. Pump suction filter might be clogged

Question 38It 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 and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction 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 suction manifold valveD. Bilge pump suction pipeline leaking between the manifold and the pump

Question 39 Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pump. What is the factor which de-clutches the vacuum pump from the pump clutch?A. Low suction pressure acting against the spring loaded declutching pistonB. High suction pressure acting against the spring loaded declutching pistonC. Low discharge pressure acting against the spring loaded declutching pistonD. High discharge pressure acting against the spring loaded declutching piston

Question 40The ballast valve of the fore peak tank is located in the duct keel and cannot be opened or shut by remote operation. The valves of other tanks can be operated remotely without any trouble. Which of the following will be the best practice?A. Valve should be checked locally for troubleshooting without which it is difficult to find the exact problemB. 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

*Question 41 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 the best alternatives):A. Bimetallic corrosionB. Selective phase corrosionC. ErosionD. Impingement corrosion

*Question 42 You must have used reinforced rubber joints. The reinforcement is normally provided using non-asbestos fibres. The reinforcement is provided becauseA. Ordinary rubber gasket have a porous matrix, having capillaries which can allow liquid leakage when subjected to high pressureB. To increase the load carrying capacity of joint so it can withstand higher pressuresC. To increase the temperature resistance of the jointD. To protect the joints from fire or other accidental damage

*Question 43 The common term used for failure of metal and alloys in a corrosive environment , when subject to high stresses is known as :A. Fatigue failureB. Corrosion fatigueC. Stress corrosion crackingD. Fretting Corrosion

Question 44 Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of _________ typeA. Bevel GearB. Rack & Pinion GearC. Planetary GearD. Worm & Worm Wheel

*Question 45Cladding is the process used for :-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

Question 46 A sea chest filter has to be cleaned. Which one of the following best practice should be followed prior opening the filter?A. Close inlet & outlet valves of the filter before opening the filterB. Close inlet & outlet valves of the filter, then open the vent to release pressure before opening the filterC. Close inlet & outlet valves of the filter before opening the filterD. Put the other sea chest into use, isolate the filter by closing inlet & outlet valves, purge the filter body to depressurize it and then open up slowly

Question 47 It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause?A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge 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

*Question 48Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?A. StandpipesB. Purifier outletsC. Inlet or outlet of L. O. coolersD. Tank drains

Question 49 Chromium is a nobler metal when compared to that of steel. In some marine applications Chromium is electroplated to the steel surfaces. Why?A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protectedB. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfacesC. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protectionD. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant

Question 50 Correct method of greasing a centrifugal pump bearing is:A. To pump the grease until you feel high back pressure on the Grease pumpB. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearingC. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. The drain plug should then be replacedD. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug,until all the old grease is removed and new grease starts coming out of the drain, repeating samefor each bearing. the drain plug should then be replacedQuestion 51 When A/E stand by F.O.heater in use of main enginea. Sudden opening F.O. inlet valve pressurized and damage the heaterb. F.O. in vapour lock inside heater allow steamc. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not pressurized may cause sudden change in engine /per load/rpmd. heater leaking.

Question 52 Incorrect sampling point oil analysis in shipa. L.O. outletb. L.O. cooler I/T & O/Tc. Main supply Lined. Purifier O/T

Question 53Types of corrosion in fresh water of D/Ea. Stressb. Hot corrosionc. bimetallicd. selective phase corrosion

Question 54 Not preventing cold corrosion in M/E componenta. Running Engine at high loadb. J/W cooling temp. highc. High TBN cylinder oild. Cooling charge air in air cooler dew point.

Question 55Super 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

Question 56A 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 togetherb. The ball can be machined while the seat can be replacedc. Normally both the non-metallic seats get worn out and have to be replacedd. Normally ball gets damaged and has to be replaced

Question 57An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you(a) Continue to run the engine and wait for some time(b) Stop the engine for a while and make some checks(c) Reduce the load of the engine(d) Run it on steady load to make some checks.

Question 58During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damagedB) Reduce the vacuum further to control the relative expansionC) Keep manoeuvring irrespective of damage to the turbinesD) Request the bridge to try to reduce number of astern movements

Question 59Refer cooling tubes act as self-cooling & expansion bya) Straight tubeb) U tubec) Spring tube

Question 60How is manual desludging carried out if automatic fails in purifier? What will be your first step of action?

Question 61Which of the following V/V cannot be overhauled in place without removing piping?(A) Ball Valve (B) Diaphragm valveC) Globe valve (D) Butterfly valve

Question 62Copper 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

Question 63When pressure inside a system falls below that of the vapour pressure of the liquid Cavities r formed, cavities travelling to high pressure region collapses releasing Considerable energy damage the metal surface which is known asA) Cavitation B) Erosion C) Impingment Corrosion D) Cavitation Erosion

Question 64After over hauling reciprocating pump the motor connections were wrongly given. Determine outcome when pump is started?A) The direction of flow wl remain unaffected B) the direction of flow wl b reversedC) The pump wl get damaged because the suction valve wl block the reverse flow causing overpressure leading to pump breakdown.D) The pump wl lose suction N there wl b no flow.

Question 65Pump driven type clutch attached to vacuum pump are commonly used for priming ballast pump n emergency fir pump. What is the factor which clutches the vacuum pump to pump the clutch during start of the pump.A) Low suction pressure acting against the spring loaded clutching pistonB) 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 piston

Question 66You are responsible for daily transfers of engine room bilges. You follow the sequences aft fwd (P)-fwd(s) bilge well and you have never experienced a problem but 5/E started the transfer and first transferred forward (s) bilge well and without any problem and you join him later you find that bilge pump is not taking suction from Fwd(p) and aft bilge well and then you have checked everything is normal. what is the cause.A) 5th engineer made a mistake by 1st transferring the fwd (s) bilge well, normal sequence of operation for engine room machineries should not be disturbed.B) fwd (s) Bilge well suction valve is leakingC) Bilge pump suction filter cover gasket is leaking.D) Fwd (s) Bilge well suction filter cover gasket is leaking.

Question 67The centrifugal pump r normallyA) Positive displacement typeB) Rotodynamic C) Screw typeD)Gear type

Question 68Sludge pump suction pressure is going full vacuum when you start the pump taking water of double bottom tank suction you have checked the suction filter n found in clean condition. Taking suction from fuel oil sludge tank does not happen. Causes of the problem.A) Pump is not working efficiently n reqd. overhaulingB) FO sludge tank suction valve is leakingC) W.O. tank D.B. tank suction pipeline has a blockage.D) Cant say what is the problem but definitely the pump needs to be opened up for overhaul

Question 69The difference between the discharges of a centrifugal pump n reci pump the discharge of centrifugal pump is ________while that of reciprocating pump is __________________A) Turbulent, LaminarB) Intermittent, continuousC) Continuous, pulsatingD) Pulaating, continuous

Question 70Which of the following. is a true statementA) Aluminium will b subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte.b) Stainless steel wl b subject to preferential corrosion when in electrical continuity with mild steel in presence of an electrolyte.C) Copper wl b subject to preferential corrosion when in electrical continuity with stainlesssteel in presence of an electrolyted) Aluminium wl b subject to preferential corrosion when in electrical continuity with zinc in presence of an electrolyte.

Question 71Ballast pump injection filter was cleaned and the pump was lined up it was found that there was some leakage in the suction filter suction. The pump started and the leakage started. During deballasting it was found that the pump could not take suction from one of the double bottoms. The cause could beA) Pump was drawing air fr.B) Pump was drawing air fr suction filterC) One of the pipelines on the suction side of the pump might be leakingD) The filter was not cleaned properly.

Question 72When 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 heating valves should b kept crack open so as to keep the heater warm.B) F.O. inlet n outlet valve should b kept shut n heating valves also should b completely shut n should b drained of any remaining F.O.c) F.O. inlet n outlet valve should b kept crack open so that the F.O. recirculation can take place.d) F.O. inlet n outlet valve should b kept shut while outlet valve should be left open so that

Question 73Sequence of metal in the increasing order of nobility 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.

Question 74For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W .temperature through the cooler has decreased from 12 deg. C to 7 deg. C over a period of time, while the drop in temperature of L.O. across the cooler has also decreased. All other coolers have been reported to be working normal & M/E is also running at a constant load in calm weather. What is the inference drawn by decrease in the temperature difference?A. The cooling S.W. inlet temperature has reducedB. The efficiency of the cooler has increased over a period of timeC. The cooler has become dirty on the S.W. side or L.O. sideD. S.W. side of the cooler may be partially blocked with mud and sea shells

Question 75Centrifugal pumps cannot handle air and require priming.But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:-A. Fluidity onlyB. Density onlyC. Both fluidity and density if single optionD. Compressibility

Question 76WHICH PROCESS IS NOT DONE ON MILD STEEL?A. hot plating,B. electrolysis,C. explosion bonding,D. metal spraying

Question 77Why 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 ineffective Gases produced by use of unapproved chemicals can pose threat to the operators

Question 78Corrosion of mild steel can b effectively prevented byA) Cathodic protectionB) Protective coatingsC) Addition of suitable alloying elementsd) using some adhesives

Question 79Cold and viscous lubricating oil of an auxiliary engine is most likely to cause ___________A) Sudden stopping of the engineB) Difficulty in starting the engineC) Rhythmic knocking sound from inside the engineD) Drop in RPM of the engine

Question 80When centrifugal pump is overhauled it was found that shaft sleeve had developed grooves on it and no spare is available onboard. What action can be taken- a. order a new spare b. assemble the pump without doing anything and wait for the spare to arrive c. machine the shaft sleeve on lathe and put back with new packing d. leave the pump as it is

Question 81Air compressor cooler tube typea) Spring typeb) Floating typec) Fixed tubed) U tubeQuestion 82After removing all the bonnet securing nuts of a large size globe valve it is found that the bonnet is NOT coming out because of strong adhesion of the gasket between the bonnet and the body. What are you going to do in line with the best practices? (Choose the best alternative)A. A chain block can be hooked onto the handwheel and bonnet should be (freed out of gasket adhesion) lifted clear of the valve bodyB. Hammer the valve bonnet and the bridge from all sides using a big hammer until the bonnet is freeC. Use a hammer and chisel and try to force the chisel in, at the joint of bonnet and body equally from all the sides until the bonnet is clearD. Try to close the valve disc further onto the seat by turning the handwheel in closing direction so as to ??? jack-up??? the bonnet

Question 83Fuels as produced in a refinery are generally sterile, however, contamination can occur as fuels areA.stored at the refineryB. stored on the vesselC.transported to the distribution sitesD.All of the above are correct.

Question 84viscosity 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

Question 85F.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 suction pressure gauge was renewed recently and is showing a positive pressure whenpump is running, but Pump is not transferring any F.O. What is the most probable 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 blocked

Question 86What is the purpose of the Bypass valve (Automatic or Manual operated) on the positive displacement pump?A. Control the Discharge PressureB. Another valve provided for DischargingC. Not requiredD. I don't know

Question 87The discharge head of a centrifugal pump will vary directly with theA. Change in impeller diameterB. Square of the impeller diameterC. Cube of the impeller diameterD. Impeller efficiency for large changes in the size of the impeller

Question 88What will you do if the liquid start rising in the Surge Drum? (Direct cooling system)a)Immediately reduce on the suction valve, and watch the Open more on the suction valve gauge.b)Stop the compressorc)It will never happen.d)Open more on the suction valve.

Question 89A drinking water circulating pump is(a) In series with the F.W. hydrophore tank.(b) In parallel with the F.W. hydrophore tank.(c) Is used to transfer F.W. from deep tanks to hydrophore tanks.(d) Is an unnecessary attachment to the hydrophore tank.

Question 90How do you know that a ballast pump is taking suction or not? If a ballast pump is taking good suction it will show:-A. Positive suction pressure and positive discharge pressureB. Negative suction pressure and positive discharge pressureC. Negative or positive suction pressure depending on the available suction head and a positive discharge pressureD. Negative or positive suction pressure depending on the available suction head and a positive discharge pressure.To confirm if the pump is still pumping, throttling of suction valve will lead to a fall in suction& discharge pressure, while throttling of discharge valve will to a rise in suction and discharge pressure.

Question 91When securing a centrifugal distillate pump, which of the listed steps should be carried out FIRST?1.Stop the pump.2.Close the pressure gage valves.3.Trip the three-way solenoid valve.4.Close the sealing line valves to the pump.

Question 92The direction of centrifugal pump depends upon whata. Vane curvature fr eye to impellerb. Vane curvature fr impeller to eyec. Direction of volute casing

Question 93Process of enrichment of surface of steel and and steel alloys by zinc using Electroplating is known asA. CathodisationB. GalvanisationC. NeutralisationD. Dezincification

Question 94Which of the following anodes in an ICCP can be used for comparatively higher current densities :-A. ZincB. High silicon IronC. Lead-silverD. Platinized Titanium

Question 95Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine componentsA. Increasing the atomization pressure of fuel injectorsB. Fitting exhaust valves with valve rotatorsC. Running engine at or near normal sea loadD. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and other as clarifier

3- brass 70 Cu & 30 Zn bronze 88 Copper + 12 Tin gunmetal 88 Cu + 10 Tin + 2 Zn

Question 96Metal cladding provides protection to the metal essentially for the life of ship becausea. 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 other methods are liable to defectsc. 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

Question 97The 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 only allow drop by drop continual leakage under positive suction pressure.d) should allow considerable leakage

Question 98Direction of rotation of centrifugal pump is reversed by changing the motor connectionsa. pump will deliver the liquid in reverse direction b. pump discharge and capacity will be affectedc. efficiency will decreased. casing get overheated

Question 99Main engine is running but viscosity of fuel cannot be maintained. Fuel oil heater have a maximum rating of 4 bar steam pressure. Steam through a pressure reducing valve is provided to the heater at 4 bar but still viscosity of fuel cannot be brought down below 20 cst. As a good marine engineering practice what will you do? a. let the engine run at same rpm n wait for the port to come to carry out the cleaning of heaterb. reduce the rpm till next port arrives n then clean the heatersc. increase the steam pressure by adjusting the setting of steam reducing valved. stop the engine and clean the heaters

Question 100Which of the following actions, pertaining to saltwater lubricated stern tube stuffing boxes, is usually observed when the ship is expected to be in port for an extended period?(A) The stuffing box is continually flushed.(B) The drain connection is left opened.(C) The stuffing box gland is tightened.(D) The packing is adjusted for greater cooling or replaced.

Question 101A centrifugal pump may fail to deliver water when first started if the _________.a: water seal pipe is pluggedb: pump is not primedc: seal ring is improperly locatedd: impeller is flooded

Question 102when centrifugal pump is changed over for pumping a liquid of higher specific gravity which of the following is going to change?a. discharge pressureb. discharge headc. power consumptiond. pump speed

Question 103Sea water outlet temp of a lube oil cooler decreases but inlet temp remains same. Load on main engine is also constant what can be concluded from thisa. decrease in cooler efficiencyb increase in cooler efficiencyc. decrease in lube oil temp.d. increase in lube oil temp.

Question 104Weldability of a metal depends on its Carbon chemical equivalent (Ce). For steel to have good weldability its Ce must be:a. Ce