RUT / REO /RUCE EXIT EXAM 8.0

71. Which of the following gauges are generally used to evaluate main bearing clearances?
    A. Poker gauge

B. Feeler gauge
C. Telescopic feeler gauge
D. Dial gauge

72. For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because
    A. changing filter elements would not interrupt engine operation
    B. filtering occurs twice in each pass of oil through the system
    C. clogging will not occur
    D. dropping pressure is half of that through a single filter unit
73. As per regulations, within how many hours before each departure, satisfactoryworking of the steering gear must be checked?
    A. 2
    B. 12
    C. 24
    D. None of the above
74. Modern 4-stroke medium speed, marine diesel engine exhaust valve spindles are rotated by providing
    A. Nozzle rings
    B. Tappet clearance
    C. Spinners or vanes
    D. Rotocaps
75. Microbiological growths in marine fuel are a common occurrence that can be
    A. extremely detrimental to equipment and operating processes
    B. prevented by maintaining proper storage temperatures
    C. removed from emulsified fuel oil during the centrifuging processes
    D. All of the above are correct.
76. The function of the tie rods is to:
    A. Keep the engine components under tension at all the times
    B. Just secure the engine parts together
    C. Act as holding down bolts for the bedplate and keeps all the engine components together
    D. Keep engine components under high compression, so that tensile stresses acting during firing stroke do not exceed this pre-compression to avoid fatigue failure
77. Which of the following types of crankshafts is much lighter at similar power requirements?
    A. Fully built type
    B. Semi built, all welded type
    C. Semi built type
    D. Solid forged type
78. After an engine has been started using a Bendix drive unit, the drive gear, orpinion disengages from the flywheel due to
    A. the action of a spring
    B. rotation of the starting cam
    C. the higher rotating speed of the flywheel
    D. accumulator pressure
79. Fuels as produced in a refinery are generally sterile, however, contamination canoccur as fuels are
    A. stored at the refinery
    B. stored on the vessel
    C. transported to the distribution sites
    D. All of the above are correct.
80. Which of the following statements is false?
    A. Excessive cylinder liner lubrication can aggravate scuffing.
    B. Use of anti polishing ring reduces scuffing.
    C. Deep honing of liner fails to give an ideal liner surface.
    D. None of the above
81. In a fully built or semi built type crankshaft, how can any slippage at shrink fitbe identified?
    A. By inspecting the locking arrangement provided
    B. By checking the dowel provided.
    C. By checking the witness mark provided for reference.
    D. By checking the performance of the engine
82. Which of the following is one of the major advantages of resin choking over cast iron choking, in holding down arrangements of modern diesel engines?
    A. Better vibration damping properties.
    B. Better compressive strength
    C. 100% contact, no need for surface preparation
    D. None of the above
83. In a 2-stroke crosshead type of engine, the side thrust generated due to rolling and connecting rod and fore-aft thrust due to pitching motion of the ship is taken care of bythe:
    A. Piston and the liner
    B. Connecting rod and the piston rod
    C. Crosshead shoes and guides
    D. Crankpin and thrust bearing
84. In a VIT equipped jerk type fuel pump:
    A. Raising the barrel delays beginning of injection
    B. Lowering the barrel delays beginning of injection
    C. Raising the barrel delays end of injection
    D. Lowering the barrel delays end of injection
85. The over speeding of the diesel engine driving an electric generator could cause
    A. low voltage trip to trip
    B. reverse power trip to trip
    C. damage to windings
    D. excessive exhaust temperatures
86. In a large, slow-speed, main propulsion diesel engine, which of the parts listed isunder tension when the engine is running?
    A. Bed plate
    B. Column
    C. Entablature
    D. Tie rod
87. Presence of catalytic fines in fuel oil is significant to engineers on board because
    A. Catalytic fines tend to impair proper operation of purifiers
    B. Catalytic fines lead to abrasive wear in liners, piston rings and fuel injection equipment
    C. Catalytic fines necessitate increase in injection temperature
    D. Catalytic fines necessitate increase in storage temperature
88. Which of the following factors affect penetration of fuel droplets during injection?
    A. Quality of atomization
    B. Injection temperature
    C. Scavenge air pressure
    D. All of the above.
89. Lube oil pumps taking suction from the sump of most small marine engines areusually
    A. of the diaphragm type
    B. of the centrifugal type

C. positive displacement type
D. independently driven by electric motors

90. Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent……….
    A. excessive crankcase pressure
    B. excessive lube oil temperature
    C. contamination of the lube oil by water
    D. contamination of the cooling water by lube oil
91. Excessive axial thickness of a piston ring can lead to
    A. Scraping off of oil from liner surface
    B. Increased wear
    C. Twisting in the groove
    D. Difficulty in formation of oil wedge
92. Which of the following is an adhesive type wear of a cylinder liner?
    A. Clover- leafing
    B. Scoring
    C. Scuffing
    D. Ovality
93. Cylinder heads of marine diesel engines are provided with _………. to relieve any excessive pressure within the combustion chamber
    A. Safety valves
    B. Indicator cocks
    C. Relief valves
    D. Bursting discs
94. Working of a pulse pressure turbocharger depends upon the……… that can be safely created in the exhaust system.
    A. Enthalpy drop
    B. Pressure difference
    C. Turbocharger rpm
    D. Pressure pulses
95. Routine cleaning of air side of air cooler of main engine is done by:
    A. Circulating fresh water
    B. Circulating cold chemical solution
    C. Circulating warm chemical solution
    D. Circulating hot water
96. What prevents rotation and fretting between a thin shell bearing and its housing?
    A. Location tangs or pegs
    B. The nip or crush of the bearing
    C. A special kind of adhesive
    D. Any of the above
97. Microbial degradation of main engine sump oils can lead to:
    A. Increased clogging of lube oil filters
    B. Corrosive attack on journals and bearings
    C. Formation of stable emulsions
    D. All of the above.
98. In case of constant pressure turbo charging, the exhaust of the cylinders goes into:

A. Small diameter exhaust pipes with exhaust grouping
B. Exhaust compensators
C. Nozzles
D. Large diameter pipes

100. Which of the following is a limiting factor in cylinder liner cooling?
     A. Maximum combustion temperature
     B. Minimum liner temperature
     C. Exhaust temperature
     D. Dew point for formation of sulfuric acid
101. Which of the following is not a consequence of over lubrication of a cylinder liner?
     A. Deposits in piston top land which can not only consume lube oil but always lead to increased abrasive wear
     B. Sticking and jamming of piston rings due to increased deposits.
     C. Unburnt lube oil in scavenge spaces posing increased risk of scavenge fire .
     D. Increased corrosive wear
102. Variable geometry turbocharging is the preferred choice over conventional turbochargers because:
     A. T/C efficiency is very high at high engine loads
     B. T/C has good starting characteristics while efficiency at full loads is slightly compromised
     C. T/C efficiency is optimized for different engine loads by changing nozzle ring geometry
     D. T/C is much cheaper and simple to manufacture and is virtually maintenance free

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