海船船员 - 三管轮

单选题

In some diesel engine designs, the injection of cylinder oil is timed to impinge when the

A. is coming upward, cylinder ring belt
B. is going downward, piston ring belt
C. is coming upward, piston ring belt
D. is going downward, cylinder ring belt

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单选题

In a _____ boiler the water flows through the inside of the tubes while the hot gases pass

A. water-tube
B. fire-tube
C. exhaust gas
D. none of the above

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单选题

A centrifuge arranged to separate impurities and small amounts of water from oil is known

A. an oily water separator
B. a purifier
C. a centrifugal compressor
D. a clarifier

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单选题

In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston

A. up and draw in a fresh air charge
B. down to burn off fuel
C. down to compress the fuel air charge
D. up and force out the exhaust gases

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单选题

Water evaporates or steam condenses at the saturation temperature, which depends upon the

A. the more
B. the higher
C. the lower
D. the highest

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单选题

Unlike the globe valve, gate valves give full bore flow without change of direction, such

A. The globe valve may be suitable for partially open operation
B. The globe valve will give full bore flow with change of direction
C. The gate valve gives full bore flow with change of direction
D. The gate valve is suitable for full bore operation only

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单选题

When a ship in loaded condition floats at arbitrary water line, its displacement is to the

A. equal
B. larger
C. smaller
D. equivalent

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单选题

To assist separation of low viscosity oils steam coils or electric heaters are fitted ______ of the oily water separator.

A. in entrance
B. in exit
C. in the upper part
D. on the outside 新题

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单选题

If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling

A. loss of suction in the circulating pump
B. leak in the primary cooling system
C. broken raw water pump shaft
D. burned or cracked piston in one cylinder

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单选题

Forcing the exhaust gases form. the cylinder of an operating diesel engine with the aid of

A. scavenging
B. forced draft
C. turbo-charging
D. aspiration

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