Valve overlap is the period during which （）.

A、the inlet valve is open

B、the exhaust valve is open

C、both valves are closed

D、both valves are open

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更多“Valve overlap is the period during which （）.”相关的问题

第1题

[单选题] The period of valve overlap is when （）.

A、the inlet valve is open B、the exhaust valve is open C、both valves are close D、both valves are open

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第2题

[单选题] The period when both inlet valves and exhaust valves are open is referred to as （）.

A、valve loop B、valve uniflow C、valve overlap D、valve grinding

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第3题

[单选题] Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）

A、during the valve overlap period B、with only the exhaust valve open C、at a pressure below atmospheric D、without cooling the cylinders or pistons

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第4题

[单选题] Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.

A、during the valve overlap period B、with only the exhaust valve open C、at a pressure below atmospheric D、without cooling the cylinders or pistons

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第5题

[单选题] If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.

A、open；short；after B、closed；short；after C、open；long；before D、closed；long；before

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第6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7题

[单选题] The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?（）

A、The profile of the valve is like a globe B、The valve seat is set into the bulbous body C、The plug or disc of the valve is made vertical to the axis of the pipe D、The valve seat is located at right side of the plug or disc