Motor Engineering – MEO CLASS 4 MMD PAPER

61. When m/e is running in emergency condition which of the alarms can’t be bypassed
    1. LO low pressure
    2. Jacket water high temp
    3. Piston cooling water high temp
    4. All the above

ANS.: D

62. 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 and other as clarifier

ANS.: C

63. Where boiler point temp high?
    1. Riser
    2. Superheater
    3. Primary steam drum
    4. Secondary steam drum

ANS.: B

64. Sudden stop of diesel engine
    1. air in system
    2. water in system
    3. air filter chocked
    4. water in air filter

ANS.: A,B,C

65. Mixed lubrication consist of
    1. Mix two lubes oil
    2. Contamination of hydrodynamic lube oil.
    3. Mixed grease and oil

ANS.: B

66. The muffling of exhaust gas noise in 4 stroke auxiliary engines in achieved by
    1. Allowing the gas to expand.
    2. Change the direction of their flow.
    3. Cool the gas with injected water.
    4. Cool the gas with scavenge air

ANS.: A,B,C

67. 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

68. To avoid the engine running too long on critical speed during start up it is necessary to
    1. Start at speeds above critical speed.
    2. Start at speeds just below critical speed and quickly move across the critical speed.
    3. Start at maximum speed and quickly bring down to just above critical speed.
    4. Eliminate totally the hazards of critical speed by ignoring it

ANS.: B

69. Supercharging an existing medium speed naturally aspirated engine will
    1. Reduce weight of the engine.
    2. Reduce bulk of the engine.
    3. Increase existing power.
    4. Increase piston speed.
    5. Reduce fuel consumption

ANS.: C,D

71. When using low sulfur fuel oil for Emission Control Areas (ECA???S), ideally the TBN of the cylinder oil used should be
    1. Lower than normal
    2. Higher than normal
    3. Same as normal
    4. Same as normal if the feed is kept higher

ANS.: A

72. Which of the following functions is done by a cam operating an exhaust valve?
    1. It governs the timing of opening and closing of the valve.
    2. It governs the speed at which the valve operates
    3. It governs the amount of opening of the valve
    4. All of the above

ANS.: D

73. In the latest concept of Variable Geometry Turbocharging, _______angle can be varied to match the turbocharger at varying engine loads
    1. Compressor vane
    2. Turbine blade
    3. Nozzle ring blade
    4. Diffuser ring blade

ANS.: C

74. The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent
    1. accidental dry firing and overpressure
    2. uncontrolled fires in the furnace
    3. explosions in the boiler furnace
    4. explosions in the boiler furnace

ANS.: C

75. Directional intake ports in diesel engines are used to
    1. reduce air charge turbulence
    2. induce air swirl
    3. deflect hot combustion gas away from the valves
    4. oppose the effects of piston induced squish

ANS.: B

76. Why does a chain stretch in service?
    1. Due to plastic elongation
    2. Due to high temperature expansion
    3. Due to wear on rollers and bushes
    4. Due to the phenomenon of creep

ANS.: C

77. Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?
    1. Splash lubrication
    2. Pressure lubrication
    3. Sight feed lubricators
    4. Mechanical lubricators

ANS.: B

78. External fouling of boiler tubes can lead to:
    1. Greater steam generation
    2. Tube corrosion
    3. Tube Erosion
    4. Protection of tube against corrosion

ANS.: B

79. What is the purpose of the inlet grid provided within the exhaust gas casing in the gas flow path, prior entry to turbocharger ?
    1. To filter out any unburned carbon
    2. To absorb and dampen the pressure fluctuation
    3. To reduce noise in the constant pressure exhaust piping
    4. To prevent any broken piston rings finding their way to turbine

 

79. The main function of tie rods in the construction of large, low speed diesel engines is to
    1. stiffen the bedplate in way of the main bearings to increase the engine’s longitudinal strength
    2. accept most of the tensile loading that results from the firing forces developed during operation
    3. mount the engine frame securely to the hull to prevent shaft coupling misalignment
    4. connect the crosshead solidly to the piston rod

 

79. The fall in speed that occurs in a diesel engine equipped with governor, on increase of load is called:
    1. Offset
    2. Speed drop
    3. Speed droop
    4. Speed offset

ANS.: C

82. Which of the following factors governs the lower limit of thrust bearing clearance?
    1. To allow some oil leakage to prevent overheating
    2. Reduction of oil viscosity
    3. Alignment of crankshaft
    4. To allow the thrust pads to tilt and generate the oil wedge

ANS.:  D

83. Which of the following can result in cracking of piston crown?
    1. Deposits in cooling spaces
    2. Impingement of fuel due to faulty injection
    3. Insufficient piston cooling oil flow
    4. All of the above

ANS.: D

84. The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to
    1. precipitate silica from solution
    2. reduce corrosion in the heating coil
    3. prevent clogging and erosion in the coil
    4. maintain zero water hardness

ANS.: B

85. What does the NLGI number of a grease indicate?
    1. The oxidation resistance of the grease
    2. The consistency of the grease i.e how fluid or non fluid
    3. Demulsibility of the grease
    4. The shelf life of the grease

ANS.: B

86. Which of the following layers of a thin shell bearing gives it its fatigue strength?
    1. The overlay
    2. The interlay
    3. The backing
    4. The barrier layer

ANS.: A

87. Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines?
    1. Steel-lined
    2. Poured babbitt, self-aligning
    3. Split roller
    4. Precision insert

ANS.: D

88. Which of the following statements is false?
    1. The fuel oil sulfur level is one of the important criteria for choice of TBN level of cylinder oil.
    2. The use of anti-polishing rings or flame rings increases the consumption of cylinder oil
    3. Excessive cylinder oil feed can lead to harmful deposits in piston top land area
    4. None of the above

ANS.: B

89. When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil
    1. directly to the fuel oil heater inlet for further warm-up
    2. back to the fuel oil settler for further filtration
    3. back to the suction side of the service pump
    4. directly to the deep tanks

ANS.: C

90. Prompt correction of speed of diesel engines driving alternators, without having massive fluctuations is ensured by incorporating:
    1. Load limiting devices
    2. Load sharing devices
    3. Load sensing devices
    4. Load shedding devices

ANS.: C