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【单选题】

A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）

A、The diameter of a disc is the same as the outer diameter of the pipe

B、We can infer that the valve is opened or closed by rotating the spindle

C、A butterfly valve comprises a disc and a ring body

D、The profile of the butterfly valve is a ring body

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更多“A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）”相关的问题
第1题
[单选题] Which of the following statements concerning butterfly valves is correct?（）

A、Special tools are required for lapping or grinding  B、It is impossible to throttle flow with a butterfly valve  C、To close the valve, it is only necessary to turn the handle a quarter of a turn  D、The butterfly valve should never be used in a freshwater system  

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第2题
[单选题] The valve on the discharge side of a cargo pump on a tanker will usually be a（）.

A、butterfly valve  B、spectacle valve  C、check valve  D、globe valve  

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第3题
[单选题] A （） in the air delivery line near to each compressor is essential.

A、butterfly valve  B、globe valve  C、gate valve  D、non-return valve  

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第4题
[单选题] In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.

A、Globe valve  B、Butterfly valve  C、Gate valve  D、Packless valve  

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第5题
[单选题] In the piping systems of a vessel , what type of valve gives the least resistance to fluid flow when fully open?（）.

A、Globe valve  B、Butterfly valve  C、Gate valve  D、Packless valve  

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第6题
[] The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.

A、A.butterfly valve  B、B.spectacle valve  C、C.check valve  D、D.globe valve  

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第7题
[单选题] Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.

A、globe valves  B、butterfly valves  C、gate valves  D、reducing valves  

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第8题
[单选题] In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.

A、actuate an alarm and open the engine room control valve  B、actuate an alarm and open the engine room CO2 releasing valve  C、open the engine room control valve and shut off engine room ventilation fans  D、open the engine room control valve and then the CO2 releasing valve  

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第9题
[单选题] The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）

A、governor flyweight action on a pilot valve which controls fuel injection  B、governor flyweight motion acting on fuel controls through suitable linkage  C、positioning a butterfly valve in the fuel delivery system positioning  D、a servomotor piston attached to the fuel controls  

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