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单选题
During the inspection, the starting air valves should be closed （） the engine from turning.
A
to increase
B
to speed up
C
to prevent
D
to reduce
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A and B
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单选题Air receivers installed in starting air systems are to be （）.A
cylindrical in shape with service connections located at the top and bottomB
opened and made available for inspection during biannual inspections providedC
with automatic drain traps for the removal of moistureD
so installed as to make the drain connections effective under extreme conditions of trim
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单选题Before starting an air compressor, It should be （）.A
unloadedB
primedC
filled with waterD
greased
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单选题During working of an air compressor, （） should be drained.A
inter coolerB
cylinderC
outlet pipeD
inlet pipe
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单选题Air compressors are equipped with unloading systems for the purpose of（）.A
removing all but the frictional load during startingB
relieving intercoolers of high temperature buildupsC
providing high starting torque in the drive motorD
seating valve plates during compressor shutdown
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单选题Inspection of a vessel’s propeller during dry-dock should include （）A
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inspection of the keywayC
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单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）A
They should always be started with the discharge valve closedB
They should always be started with the discharge valve openedC
A priming pump is always required to flood the impeller suctionD
They should always be started with the sealing line valves closed
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cam rollers on the camshaftB
spring forceC
air pressure on top of the valve differential pistonD
air pressure on the bottom of the valve differential piston
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overhaulB
runningC
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单选题Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）A
The expansion tank should be topped offB
The thermostatic water regulating valves should be manually openedC
The fuel filters should be changedD
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考题
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）A
noise coming from that air starting valveB
continuous operation of the starting air compressorC
zero air pressure in the air starting systemD
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单选题Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.A
in boiler drumsB
in refrigerating plantsC
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单选题The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.A
air compressorB
refrigeration compressorC
vacuum pumpD
purifier
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单选题What is TRUE of pressure/vacuum valves? （）A
They are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tankB
They should operate in advance of the pressure/vacuum breakersC
They should be kept in good working order by regular inspection and cleaningD
All of the above
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