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【单选题】

Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）

A、Flows of fluids can be restricted by both cocks and valves

B、There are seats in the internal passages of valves

C、A disc of valve only moves up and down

D、We can infer that there is a bore in cock ping

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更多“Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）”相关的问题
第1题
[单选题] In each cylinder cover there are two or three holes for （）

A、the exhaust valves  B、the fuel valves  C、indicator cocks  D、the fuel pumps  

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第2题
[] Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.

A、A.exhaust valves  B、B.starting valves  C、C.fuel valves  D、D.the indicator cocks  

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第3题
[单选题] The scale trap is located between the （）

A、king valve and the expansion valve  B、solenoid valve and expansion valve  C、evaporator and receiver  D、compressor and evaporator  

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第4题
[单选题] Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in （）

A、an air bound fuel system  B、damage to cylinder heads and pistons  C、excessive fuel injection  D、excessive air valve lift  

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第5题
[单选题] In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.

A、open and individual tank valves open  B、open and the individual tank valves closed  C、closed and the individual tank valves closed  D、closed and the individual tank valves open  

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第6题
[单选题] In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.

A、open and individual tank valves open  B、open and the individual tank valves closed  C、closed and the individual tank valves closed  D、closed and the individual tank valves open  

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第7题
[单选题] What separate the high pressure side from the low pressure side in a refrigeration system?（）

A、Condenser and thermal expansion valve  B、King and solenoid valves  C、Compressor and thermal expansion valve  D、Condenser and solenoid valve  

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第8题
[单选题] Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）

A、The condenser and the expansion valve  B、The king valve and the solenoid valve  C、The compressor and the expansion valve  D、The condenser and the solenoid valve  

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第9题
[单选题] A relief valve for a cargo pump is generally installed（）.

A、after the discharge valve  B、between the pump and discharge valve  C、after the suction valve  D、between the pump and suction valve  

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