Where will the thrust forces from th

单选题 Where will the thrust forces from the propeller be transferred to through a thrust bearing?

A、 The hull of the ship.

B、 The engine.

C、 The gear box.

D、 The crankshaft.

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单选题 What is probably the main reason why medium-speed diesel engines were once restricted to smaller cargo ships?

A、They are cheaper than slow-speed diesel engines.

B、The fuel consumption of the medium speed engine is more than that of the slow speed engine.

C、They operate between 150 and 450 r/min.

D、Smaller cargo ships require more efficient propellers.

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单选题 Why do larger merchant vessels use slow-speed diesel engines?

A、Because they turn at about 108 r/min.

B、Because their propellers are more efficient.

C、Because they can be connected directly to the propeller without gearing.

D、Because they are fuel-saving.

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单选题 "Radioactive fuel" refers to ______.

A、the fuel possessing radioactivity

B、the residual oil

C、the fuel which is found by radio

D、the fuel which is active when received radio signals

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单选题 How many types of marine engine are discussed in the passage?

A、Two.

B、Three.

C、Four.

D、Five.

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单选题 Gas turbines differ from steam turbines in that______.

A、steam rather than gas is used to turn a shaft

B、vapor rather than gas is used to turn a shaft

C、the former uses gas to turn a shaft

D、the latter uses gas to turn a shaft

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单选题 Why do medium-speed diesel engines have gearing?

A、In view of propeller efficiency.

B、In view of engine revolution.

C、In view of fuel consumption.

D、In view of merchant ship size

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单选题 According to the author's standpoint, what does the efficiency of slow-speed diesel engine propellers depend on?

A、Propeller power.

B、Both propeller size and revolutions.

C、Propeller size.

D、Propeller revolutions.

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单选题 Steam turbines have become more attractive as an alternative to diesel power in ships ______.

A、because their rotary motion is transferred to the propeller shaft by gears

B、because the steam can also to drive the large cargo oil pumps

C、because of the reduced fuel consumption and raised power output

D、because they are 50 percent lighter

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