单项选择题

Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motors

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单项选择题

Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.

A.intake stroke
B.exhaust stroke
C.power stroke
D.compression stroke

单项选择题

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

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The water in an auxiliary boiler should be tested daily for （）.

A.dissolved oxygen
B.chlorides
C.sludge
D.dissolved nitrogen