• Spring type
• floating
• U type
• fixed type

• Sealing ring
• Shaft sleeve
• Lantern ring
• Neck bush

• Application of jerk pulls while tightening
• Using an extension
• Tightening beyond the characteristic clicking sound
• None of the above

• Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
• Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces
• Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection
• Chromium reacts with the steel to form an alloy during electroplating which is corrosion resistant

• To pump the grease until you feel high back pressure on the Grease pump
• To pump the grease for 3-4 pumping strokes of the Grease pump for each bearing
• 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 the Grease pump for each bearing. the drain plug should then be replaced
• 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 the same for each bearing. the drain plug should then be replaced

• Fluidity only
• Density only
• Both fluidity and density 
• Compressibility

• Low suction pressure acting against the spring-loaded clutching piston
• High suction pressure acting against the spring-loaded clutching piston
• Low discharge pressure acting against the spring-loaded clutching piston 
• High discharge pressure acting against the spring-loaded clutching piston

• Pump suction filter cover gasket leaking
• The suction filter cover gasket of one of the Bilge wells is leaking
• Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve 
• Bilge pump suction pipeline leaking between the manifold and the pump

• Increase in direct proportion to the increase in speed 
• Decrease in direct proportion to the increase in speed
• The flow rate doesn’t depend upon the speed
• Flow

• There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump
• The Fwd. (P) bilge well suction valve might be leaking
• The Fwd. (P) bilge well suction filter cover gasket might be leaking 
• The pump needs to be overhauled

• Standpipes
• Purifier outlets
• Inlet or outlet of L. O. coolers 
• Tank drains

• gate v/v 
• butterfly v/v
• ball v/v
• plug v/v

• Weekly
• Monthly
• At least 3 months 
• Before arrival n departure

• Follow up
• Non follow up

• LIQUID LINE
• LIQUID WITH VAPOUR LINE 
• LIQUID WITH DIRT LINE
• ALL OF THE ABOVE

• Stop the pump.
• Close the pressure gage valves.
• Trip the three-way solenoid valve. 
• Close the sealing line valves to the pump.

• Gate valve 
• Globe Check Valve
• Swing Check Valve
• Angle check valve

• Uneven tightening of casing bolts
• Gasket thickness very thin
• More wear ring clearance
• Only a
• a and b
• a and c

• Low suction pressure acting against the spring-loaded declutching piston
• High suction pressure acting against the spring-loaded declutching piston
• Low discharge pressure acting against the spring-loaded declutching piston
• High discharge pressure acting against the spring-loaded declutching piston

• A gear pump is self-priming while a reciprocating pump is not
• Discharge of a gear pump is not affected by the direction of rotation while that of a reciprocating pump is reversed
• The discharge of the reciprocating pump is pulsating and the discharge rate is lesser 
• Reciprocating pumps are only available in high capacities and for smaller capacities, only gear pumps can be used

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

• Spalling
• Cracking
• Shrinkage cracking
• Slagging

• TRUE
• FALSE 
• First Sentence is right. The second one is wrong
• I don’t know

• Remove the pump suction filter and pump out the tank
• Increase the tank temperature, keep an eye on the pump suction pressure and clean the filter as soon as it drops 
• As soon as the shore facility tells you that they are not receiving any sludge, you stop the pump and clean the filter
• Fabricate a bigger mesh size suction filter and use in place of the normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate

25.Pump Start but Motor get overloaded or Trip on overload. 

• Alignment is wrong 
• Gland packing too tight 
• Worn out / Damaged ball bearing 
• Cavitations exist 
• All of the above

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

• The ball and seat can be lapped together 
• The ball can be machined while the seat can be replaced 
• Normally both the non-metallic seats get worn out and have to be replaced 
• Normally the ball gets damaged and has to be replaced

27. The difference between the discharges of a centrifugal pump n reciprocating pump the discharge of the centrifugal pump is ———-while that if reciprocating is ——— A) Turbulent, Laminar

• Intermittent, continuous
• Continuous, pulsating
• Pulsating, continuous

28. Purifier is not rotating with the desired rpm, reason?

• Frequency low
• Bus bar voltage low
• Friction pads worn out

29. The function of an accumulator on the discharge side of a reciprocating bilge pump is to: 

• Supply liquid even when the pump is not running 
• Dampen out the pressure pulses and smoothens the flow 
• Increase the discharge pressure by storing liquid under pressure 
• No such device is required to be fitted to modern bilge pumps

30. The most important control measure to prevent boiler tube failure is:

• Use of proper refractory material 
• Proper maintenance of fuel-burning equipment 
• Proper maintenance of boiler water condition 
• All of the above

31. Refer cooling tubes act as self-cooling & expansion by

• Straight tube
• U tube
• Spring tube

32. F.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 when the pump is running, but the Pump is not transferring any F.O. What is the most probable cause?

• The pump is damaged and needs an overhaul
• The suction filter cover gasket might be leaking
• Pump relief valve might be leaking
• The pump suction pipeline is blocked

33. A ball valve was found leaking in service. Upon inspection, it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?

• The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed
• Either a the floating seat is pressed onto trunnion supported ball by liquid pressure or the floating ball is pressed onto the seat
• The ball is not exactly spherical and is shaped such that during closure the surface coming into contact with the seat is of slightly bigger diameter providing sealing 
• The seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat

34. Copper tubing is used in the refrigerant system because

• It has a less internal resistance
• It is cheaper compared to other materials.
• It is easier to check leaks in copper-based system
• None of the above

36. The gland packing of the centrifugal pump should have  A) Not allow any breakage under the suction pressure.

• Should only allow drop by drop continuous leakage under positive suction pressure.
• Should allow considerable leakage

37. Which of the following valve is liable to open or close under pressure of a fluid, if not locked in position?

• Gate valve
• Globe valve
• Plug valve
• Butterfly valve

38. If dew point increases what happens to wet bulb temp and dry bulb temp? 

• Will be same

39. The dew point is reached when the wet bulb temperature is

• Equal to the dry bulb temperature

40. As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will

• Decrease

41. ESD III  refractory

• Fire
• Insulation 
• Membrane webs

42. Change in volume in a closed cooling system is achieved by 

• Freshwater expansion tank

43. Turbocharger most preferred

• Cheap
• Boost air pressure
• Increase efficiency
• Reduce NOx

44. Microbial degradation

• Corrosive 
• Stable emission
• Caustic fire
• All the above

45. Function of a de-superheater is to. A. Protect superheater from overheat

• Control superheater steam outlet temperature
• Increase the efficiency of the boiler
• Reduce steam temperature for auxiliary uses after steam superheater

46. Why should combustion blowers left running for while after firing a boiler?

• To cool the furnace internal
• To remove the gases
• To cool tubes
• None

47. Dezincification of brass can be prevented by the introduction of additives like

• Nickel
• Cobalt
• arsenic
• Tungsten 

48. The principle of fire fighting onboard is

• Watering of fire
• Starving of fire
• Cooling 
• Smothering of fire