The exhaust valve is opened at about the same time （） the air inlet ports are opened.

A、before

B、after

C、when

D、until

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更多“The exhaust valve is opened at about the same time （） the air inlet ports are opened.”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] 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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第3题

[单选题] In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.

A、the beveled edges of the intake valves provide for serf-centering during seating B、intake valves utilize stellite-coated valve seat inserts which reduce wear C、the volume of air passing through intake valves is less than the volume of air passing through exhaust valves D、intake valves are less affected to the corrosive action of exhaust gases

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第4题

[单选题] In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

A、by an fuel valve B、through an inlet valve C、with an exhaust valve D、from an outlet valve

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第5题

[单选题] The diesel engine valve subjected to most severe conditions of service is the （）.

A、cylinder exhaust valve B、air starting valve C、air inlet valve D、cylinder relief valve

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第6题

[单选题] In each cylinder cover is a large central opening for mounting （）

A、the indicating cock B、the starting valve C、air inlet valve D、the exhaust valve

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第7题

[] Diesel engine valve springs function to （）

A、A.hold the valves open B、B.keep the valves off their seats until the exhaust stroke is completed C、C.close the valves D、D.open inlet valves when the air injection cycle begins