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High diesel engine cooling water temperatures can be caused by _____.A.a worn water pumpB.

High diesel engine cooling water temperatures can be caused by _____.

A.a worn water pump

B.not enough coolant

C.air in the cooling system

D.all of the above

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第1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 seas

B.ensure engine vibrations correspond to the natural frequency of the hull

C.permit the engine to expand away from the driven equipment as the engine heats up and expands

D.maintain engine thrust bearing clearances

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第2题

With one or more cylinders out of operation, the engine speed must be reduced because .

A.in such cases, the air supply is no longer optimal, the thermal load will be higher

B.governor hunting will occur

C.torsional vibrations as other mechanical vibrations may occur

D.all of the above are correct

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第3题

On opposite ends of a single shaft of a turboblower are a gas driven _____ and a air compressor, which are sealed each other.

A.charge air receiver

B.scavenging air belt

C.turbine

D.air cooler

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第4题

The fire of sodium is classified as_____ fire.

A.Class A

B.Class B

C.Class C

D.Class D

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