搜题

【单选题】

Most propellers on merchant vessels are constructed of（）.

A、managanese bronze

B、cast iron

C、mild steel

D、improved plow steel

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更多“Most propellers on merchant vessels are constructed of（）.”相关的问题

第1题

[单选题] m>Onm> a vessel with a single propeller，transverse force has the m>mostm> effect m>onm> the vessel when the engine is put（）.

A、full ahead B、full astern C、half ahead D、slow astern

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第2题

[] Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending m>onm> rotatim>onm>. This force is caused by（）.

A、A.back current from the rudder B、B.greater pressure m>onm> the right or left side of the propeller，depending m>onm> rotatim>onm> C、C.lower pressure m>onm> the right or left side of the propeller，depending m>onm> rotatim>onm> D、D.torque from the velocity and angle at which the surrounding water impinges upm>onm> the propeller blades

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第3题

[单选题] Kort nozzles are installed around the m>propellersm> of some vessels to（）.

A、Increase the thrust of the propeller B、Protect the propeller from striking sawyers C、Prevent the propeller from striking barges towed m>onm> the ship D、Prevent the propeller from touching bottom in low water

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第4题

[单选题] “Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired, or at least patched up temporarily until the next stop” This sentence means that （）.

A、Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired m>onm> the spot B、Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired m>onm> the next port of call C、Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired until the next stop D、Any leaks in piping, propeller shaft, machinery, tanks, will have to be at least patched up

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第5题

[单选题] I’m m>onm> fire and have dangerous cargo m>onm> board. The m>mostm> urgent assistance (最紧急的援助)in this case would be（） .

A、lifeboat B、medicine C、firefighting D、lifesaving

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第6题

[单选题] I’m m>onm> fire and have dangerous cargo m>onm> board.The m>mostm> emergent assistance in this case would be（）.

A、life boat B、helicopter C、fire-fighting D、medicine

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第7题

[单选题] I’m m>onm> fire and have dangerous cargo m>onm> board. The m>mostm> emergent assistance in this case would be（）.

A、life boat B、helicopter C、fire-fighting D、medicine

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第8题

[单选题] The pitch of a propeller is a measure of the（）.

A、angle that the propeller makes with a free stream of water B、angle that the propeller makes with the surface of the water C、number of feet per revolutim>onm> the propeller is designed to advance in still water without slip D、positive pressure resulting from the difference of the forces m>onm> both sides of the moving propeller in still water without slip

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第9题

[单选题] 0ur vessel’s propelled makes 120（）at full speed.

A、r.p.m B、p.r.m C、m.p.r D、p.m.r

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