Function – 6 ( MEP)

61. In a Sea Water cooled J.C.W. cooler, the most common cause for loss in cooling efficiency of the heater is:
    1. Scale formation on J.C.W. side
    2. Mud/silt deposits on J.C.W. side
    3. Scale formation on S.W. side
    4. Mud/silt deposits on S.W. side

ANS.: C

62. Cadmium coatings provide corrosion protection. Cadmium coatings are commercially carried out using which of the following methods:-
    1. Metal Spraying
    2. Electro-plating
    3. Hot-dipping
    4. Metal diffusion

ANS.: B

63. The machinery which is usually tested first once the ship reaches a dry dock is
    1. Engine room crane
    2. Engine room lift
    3. Gantry crane for engine room
    4. All of the above

ANS.: D

65. The common term used for failure of metal and alloys in a corrosive environment, when subject to high stresses is known as:
    1. Fatigue failure
    2. Corrosion fatigue
    3. Stress corrosion cracking
    4. Fretting Corrosion

ANS.: C

66. Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of _________ type
    1. Bevel Gear
    2. Rack & Pinion Gear
    3. Planetary Gear
    4. Worm & Worm Wheel

ANS.: D

67. Cladding is the process used for:-
    1. Protection of metal surfaces against corrosion
    2. Protection of metal surfaces against erosion
    3. Protection of metal surfaces against cavitation erosion
    4. Protection of metal surfaces impingement corrosion

ANS.: A

68. Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
    1. Standpipes
    2. Purifier outlets
    3. Inlet or outlet of L. O. coolers
    4. Tank drains

ANS.: C

69. Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why?
    1. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
    2. Chromium plating provides corrosion protection as well as high glossiness and high hardness forbetter wear resistance and reduced friction to the steel surfaces
    3. 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
    4. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant
70. Graphitization is the term used to describe:
    1. Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite
    2. Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to lossof strength
    3. Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion
    4. Chemical reaction between pure graphite and iron so as to increase the graphite content of iron

ANS.: B

72. Accelerated corrosion due to removal of protective surface films (e.g.) oxide layers on metal/alloy surfaces due to turbulence of working fluid is known as
    1. Bimetallic corrosion
    2. Impingement corrosion
    3. Cavitation erosion
    4. Selective phase corrosion

ANS.: B

73. An auxiliary engine turbo-charger 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
    1. Continue to run the engine and wait for some time
    2. Stop the engine for a while and make some checks
    3. Reduce the load of the engine
    4. Run it on steady load to make some checks.

ANS.: B

 

75. Cold and viscous lubricating oil of an auxiliary engine is most likely to cause ___________
    1. Sudden stopping of the engine
    2. Difficulty in starting the engine
    3. Rhythmic knocking sound from inside the engine
    4. Drop in RPM of the engine

ANS.: B

76. viscosity of fuel oil used for ME was 145cst,new fuel comes whose viscosity was more than earlier, what should u do
    1. increase temp setting
    2. change setting of viscotherm
    3. do nothing
    4. open steam valve manually more

ANS.: C

77. Corrosion of mild steel can be effectively prevented by
    1. cathodic protection
    2. protective coatings
    3. addition of suitable alloying elements
    4. applying adhesives

ANS.: 1,2,3

78. In a three phase electrical equipment, the immediate action in the event of fuse blowing in one of the phases would be
    1. to replace with a fuse of correct rating
    2. to replace fuses on all three phases
    3. to try to repair the fuse
    4. to investigate the fault that led to blowing the fuse

ANS.: D

79. A butterfly valve was found leaking and has to be overhauled.Which of the following is a correct statement?
    1. There is no need to remove the valve from pipeline and it can be overhauled in place
    2. Butterfly valves cannot be overhauled without removal from pipelines
    3. It is better idea to remove the valve from pipeline and then carry out the maintenance rather than do it in place
    4. It will depends on the time available to you, whether you will remove valve from pipeline or overhaul in place

ANS.: B

80. The lower half of main bearing of a very large diesel engine can be removed by:
    1. Pulling out with a chain block
    2. By hammering out with the help of a soft mallet
    3. By slightly jacking the crankshaft and turning out the bearing half with a rope or similar tackle provided.
    4. By using a special tool in the oil hole and turning the shaft to turn out the lower half.

ANS.: D

81. Which of the following option gives you the correct sequence of the metals/alloys in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte?

1. Stainless Steel , Naval Brass , Aluminium bronze , Copper
2. AluminiumBronze ,Cupro-Nickel , Monel metal , Titanium
3. Stainless Steel ,Cupro-Nickel ,Naval Brassl , Monel Metal
4. Stainless Steel , Copper, Naval Brass , Aluminium bronze

ANS.: B

83. Why is use of Polymer treatment restricted to low-pressure boilers?
    1. It does not effectively control sludge formation.
    2. It does not effectively control scale formation.
    3. It has no PO₄ present to counter caustic alkalinity
    4. All of the above

ANS.: C

84. During stripping operation the discharge valve is kept throttled to maintain sufficient back pressure, why?
    1. To avoid back flow of sea water into the ballast tank
    2. If back pressure is not sufficient, the ballast water cannot be pumped out as the sea water head on the outside is more
    3. To avoid pump losing suction due to loss of priming as the available suction head is very low
    4. To control the motor current which will otherwise be very high

ANS.: C

85. During shutting down the purifier you find that purifier always vibrates heavily for some time and then becomes normal until it finally comes to a stop. What should be done to avoid this situation?

1. The purifier bowl should be cleaned before next startup
2. The brake should be applied so that the critical speed doesn’t last long
3. Complete overhaul of the purifier should be carried out and the bearings need to be renewed
4. The bowl should be sent for balancing

ANS.: B

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

1. The purifier design is faulty
2. The purifier bowl has a heavy sludge deposit and requires cleaning
3. The purifier bowl is not balanced properly
4. During shutting down most of the purifiers pass through the critical speed zone

ANS.: D

 

86. SDNR valve is the term used for which of the following type of valves?
    1. Standard Dimension Non-Rusting Valve
    2. Screw Down Non-Return Valve
    3. Small Diameter Negative-Range Valve
    4. Stainless Disc Non-Rusting Valve

ANS.: B

88. Steel is an alloy of Iron ,carbon and alloying elements . The carbon content of steel is :
    1. Less than 1%
    2. Less than 2%
    3. More than 2%
    4. Any percentage of carbon

ANS.: B

89. The seating material for perfectly sealing type Ball valves is usually made up of
    1. Rubber
    2. PTFE or Nylon
    3. Rubber reinforced with steel wire
    4. Stainless steel

ANS.: B

90.The main disadvantage of a centrifugal pump is that:

1. They are only available in high capacities
2. They are difficult to maintain
3. They are notself priming in nature
4. They are extremely expensive pumps

ANS.: C

 

91. The advantage of a reciprocating bilge pump over centrifugal pumps is that:
    1. They do not have any advantage over a centrifugal pump
    2. They have greater capacity to weight ratio
    3. They give a smootherdischarge if used in conjunction with an accumulator
    4. They areself priming in nature

ANS.: D

94. For shaft sealing of a main sea water pump for ship plying in coastal muddy waters, which is the best option
    1. Gland packing
    2. Lip seal with garter spring
    3. Mechanical seal
    4. Cup seal

ANS.: A

97. Excessive lubrication in compressors can lead to:
    1. Sticking of valves
    2. Carryover and deposit of oil particles in pipelines and reservoirs
    3. Decompression
    4. Detonation

ANS.: A,B

98. Which of the following valve types is available with non-return arrangement?
    1. Gate Valve
    2. Globe Valve
    3. Ball Valve
    4. Butterfly Valve

 

ANS.: B

99. Types of tubes in refer cooler
    1. straight tube
    2. U tube
    3. coil tube
    4. spring tube

ANS.: D

100. M/E FO heater steam control v/v set to on viscosity control mode, when u start using FO different viscosity
     1. Change setting viscosity index
     2. Temperature controller
     3. No change in viscosity and viscosity will automatically controlled
     4. We have to change the mode manually

ANS.: C

101.Provide in protection against mild steel galvanic corrosion

1. Copper
2. Aluminum
3. Stainless steel
4. None of the above

ANS.: B

102. Less vacuum in centrifugal p/p
     1. Leak of discharge v/v
     2. Loss of gland packing
     3. Loss of fluid in suction tank
     4. Long suction p/p

ANS.: B

103.Type of corrosion in fresh water of D/E

1. Stress
2. Hot corrosion
3. Bimetallic corrosion
4. Selective phase corrosion

ANS.: D