The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.

A、tape face

B、tapered face

C、surface

D、thinner face

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更多“The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.”相关的问题

第1题

[单选题] During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.

A、ensure penetration and distribution of the fuel in the combustion chamber B、ensure the needle valve is flushed clean during each injection C、prevent combustion gas blowback into the open needle valve D、prevent reflected pressure waves when the needle valve closes

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第2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3题

[单选题] Which of the valves listed should be used either in the fully opened or the fully closed position?（）

A、A gate valve B、A globe valve C、Any check valve D、Any needle valve

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第4题

[单选题] If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）

A、rack position should be adjusted B、compensating needle valve should be opened fully compensating C、needle valve should be adjusted to stabilize operation D、speed limiting device should be adjusted

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第5题

[单选题] The injector pump is operated by a cam which drives （） up and down.

A、the needle valve B、the plunger C、the piston D、the cylinder

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第6题

[单选题] When the heat load begins to increase, the needle valve of an expansion valve will（）

A、move in an opening direction B、move in a closing direction C、either open or close D、not move at all

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第7题

[单选题] A large change in ambient temperature, or using an oil of a viscosity different from the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the （）.

A、pilot valve opening B、compensating needle valve C、compensating spring tension D、accumulator spring tension