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单选题
Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）
A
To reduce the main engine speed
B
To increase the main engine speed
C
To govern the main engine speed
D
To fix the propeller shaft
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单选题Regulations require certain records to be retained on board for at least 3 months after a ship is involved in a casualty or until advised that they are no longer needed on board by the （）.A
ownerB
MasterC
person in chargeD
Officer in Charge，Marine Inspection
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a non-power driven vesselB
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单选题Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive（） the life of the ship.A
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单选题Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）A
To reduce the main engine speedB
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To govern the main engine speedD
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The cost of carbon emission permits is driven down.B
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单选题The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.A
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单选题When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to （）A
maintain alignment when the ship’s hull is working in heavy seasB
ensure engine vibrations correspond to the natural frequency of the hullC
permit the engine to expand away from the driven equipment as the engine heats up and expandsD
maintain engine thrust bearing clearances
考题
单选题The ship（）on a low rock was broken in two by the waves.A
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