Function – 6 ( MEP)

31. The delivery rate of an axial piston hydraulic pump is controlled by varying the position of the _____________.
    1. Tilting box
    2. Slide block
    3. Pintle
    4. Reaction ring

ANS.: A

32. Who gives hotwork permit on drydock
    1. Master
    2. chief engineer
    3. Superintendent
    4. Dock engineers

ANS.: D

 

35. The corrosion protection for Cooling Fresh Water systems of Marine Diesel Engines is normally provided by :
    1. Sacrificial anodes
    2. ICCP
    3. Protective Metal coatings of system components
    4. Addition of corrosion inhibitors to the Cooling Fresh water

ANS.: D

 

 

36. The temperature of the refrigerant is highest just before it enters the __________.
    1. frosting region
    2. evaporator
    3. condenser
    4. gage pressure

ANS.: C

41. You have to dismantle a F.O. heater for cleaning . You have closed both inlet and outlet valves of the heater, both for F.O. n steam side. What will you do before u start opening the heater?
    1.  There is nothing more to be done, if you know the valves r holding u can straight away start opening the heater without wasting time.
    2.  Drain the heater till pressure gauge reads zero and then start opening the heater.
    3.  Drain the heater till F.O. stops coming out of the drain and then start opening the heater.
    4.  First open the vent valve and allow the heater to depressurize,then open the drain valve to drain the contents of the heater.
42. During flooding of dry dock following items must be verified?
    1. All sea valves are operational
    2.  All overboard discharge valves r operational
    3.  Stern tube seal r operational
    4.  All above

ANS.: D

43. Which valve is not quarter turn valve?

1. Ball
2. Butterfly
3. Gate
4. Plug

ANS.: C

44. Which valve is not quarter turn valve?
    1. Ball
    2. Butterfly
    3. Globe
    4. Plug

ANS.: C

 

45. Butterfly valve stuck in half open position. How to repair
    1. cant b taken out in open position from line so try to close valve anyhow
    2. apply hammer to shut it
    3. remove pipeline and do the overhaul
    4. cannot be repaired onboard

ANS.: C

46. Which of the following option gives u the correct sequence of the metals in increasing order of nobility in galvanic series
    1. stainless steel, Mild Steel, Cu, Zn
    2. Cu, stainless steel, Mild Steel, Zn
    3. Zn, Mild steel, Cu, Stainless Steel
    4. Zn, Cu, Stainless Steel , Mild Steel

ANS.: C

47. Super chlorinating of fresh water tanks in dry dock is done by:
    1. Washing the tanks with 100ppm chlorine solution
    2. Washing the tanks with 50ppm chlorine solution
    3. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean water
    4. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water

ANS.: C

 

48. Which of the following statements about pipe repairs is true?
    1. A very small hole in a pipe does not necessitate permanent repair by way of renewal of section
    2. Welded doublers are acceptable as permanent repairs.
    3. Permanent repairs can only be done by using classification society approved material
    4. None of the above

ANS.: C

50. A ball valve is found leaking in service and needs to be overhauled.What type of repairs can be carried out?
    1. The ball and seat can be lapped together
    2. The ball can be machined while the seat can be replaced
    3. Normally both the non-metallic seats get worn out and have to be replaced
    4. Normally ball gets damaged and has to be replaced

ANS.: C

51. 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):
    1. Bimetallic corrosion
    2. Selective phase corrosion
    3. Erosion
    4. Impingement corrosion

ANS.: D

52. The water from discharge side of a centrifugal pump is supplied as sealing water to the stuffing box for the pump shaft at:
    1. Sealing ring
    2. Shaft sleeve
    3. Lantern ring
    4. Neck bush

ANS.: C

53. Process of enrichment of surface of steel and steel alloys by zinc using Electroplating is known as
    1. Cathodisation
    2. Galvanisation
    3. Neutralisation
    4. Dezincification

ANS.: B

55. 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 and the third one will be for ______________.
    1. Fresh water suction
    2. Cargo hold bilge suction
    3. Sea water suction
    4. Waste Oil tank suction

ANS.: C

 

56. After Overhauling pumps, pumps cannot be turned freely by hand, the possible cause could be
    1. Uneven tightness of the casing Nuts
    2. Gasket between the casing too thin
    3. Big clearance between the wear Ring
    4. Only A
    5.  A and B
    6. A and C

ANS.: E

57. If the direction of rotation of a gear pump is reversed due to change in-phase sequence, what happens when the pump is started?
    1. Direction of flow remains the same
    2. The pump will get damaged due to overpressure on suction side
    3. Pump relief valve will be lifted
    4. The direction of flow will be reversed

ANS.: D

58. Resistance testing should be ideally done on electrical equipment when the equipment is:
    1. Cold
    2. Hot or at working temperature
    3. In operation
    4. At part load

ANS.: B

59. Resistance to corrosion of Aluminium alloys is due to :
    1. Aluminium being a very noble metal when compared to other metals in Electrochemical series
    2. Formation of Aluminiumoxide(Alumina) passive film on surface
    3. The rate of corrosion is very low due to very high corrosion potential
    4. All of the above

ANS.: B

 

61.Throttling of suction v/v in screw p/p

1. Alter discharge capacity
2. Not alter discharge capacity
3. Fluid density
4. Alter fluid pressure and capacity

ANS.: D

 

62. Cavitation of centrifugal pump
    1. NPSHr>NPSHa
    2. NPSHA>NPSHr
    3. Total suction head <NPSHr
    4. Total suction head >NPSHr

ANS.: A

63. To avoid Cavitation of centrifugal pump
    1. NPSHr>NPSHa
    2. NPSHA>NPSHr
    3. Total suction head <NPSHr
    4. Total suction head >NPSHr

ANS.: B

 

66. Not preventing cold corrosion in M/E component
    1. Running Engine at high load
    2. J/W cooling temp. high
    3. High TNB cylinder oil
    4. Cooling charge air in air cooler dew point

ANS.: D

 

67. Freight paid by charterers on a quantity of cargo short-shipped, i.e quantity agreed upon but not loaded by the charterer, is called:
    1. Pro-rata freight
    2. Back Freight
    3. Dead freight
    4. None of the above

ANS.: C

 

68. Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine components
    1. Increasing the atomization pressure of fuel injectors
    2. Fitting exhaust valves with valve rotators
    3. Running engine at or near normal sea load
    4. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier another as clarifier

ANS.: C