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【单选题】

The valve that prevents water from backing out of the boiler into the feed line is the（）.

A、bottom-blow valve

B、skin valve

C、feed-check valve

D、feed-stop valve

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更多“The valve that prevents water from backing out of the boiler into the feed line is the（）.”相关的问题
第1题
[单选题] The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

A、one valve seats upwards, while the other seats downwards  B、the reed valves used on the discharge are made substantially thicker and heavier than the suction valves  C、the suction valve springs exert a greater tension than the discharge valve springs  D、the discharge valve springs exert a greater tension than the suction valve springs  

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第2题
[单选题] Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）

A、the direct acting relief valve is used for controlling lower flows and pressure  B、the pilot operated relief valve is used for controlling higher flows and pressure  C、the pilot operated relief valve is used for controlling lower flows and pressure  D、the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve  

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第3题
[单选题] The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

A、be jammed  B、be opened  C、be seated  D、be broken  

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第4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5题
[] If one of the bilge system manifold valves does not properly seat, the （）

A、A.bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied  B、B.bilge system will lose vacuum and prevent the other bilges from being pumped out  C、C.bilge well aft connected to that valve will siphon its contents to the forward bilge wells  D、D.discharge pressure will be too high  

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第6题
[单选题] The thermostatic valve has a throttling action, that is to say the valve can（）

A、stop the refrigerant from flowing  B、force the refrigerant to flow  C、cause the refrigerant pressure to rise  D、cause the refrigerant pressure to fall  

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第7题
[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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第8题
[单选题] （） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

A、A relief valve  B、An alarm  C、A pressure gauge  D、A non-maim valve  

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第9题
[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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