The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

[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 jammedB . be openedC . be seatedD . be broke

[单选题]If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .A．have a larger than normal dead bandB．produce excessive speed response to a load changeC．respond slowly to any change in engine loadD．stabilize

[单选题]If the needle valve in a fuel injection nozzle sticks open （）.A . no fuel will be delivered through the nozzleB . the nozzle will overheat and crackC . time of injection will changeD . fuel will leak into the drain line

[单选题]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 faceB . tapered faceC . surfaceD . thinner face

[单选题]The( )in the injector will lift at a pre-set pressure which ensures that the fuelwill atomize once it enters the cylinder.A．needle valveB．nozzlesC．pistonD．spring

[单选题]The （） in the injector will lift at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.A . needle valveB . nozzlesC . pistonD . spring

[名词解释] 圈干NEEDLE LOOP

[单选题]The fuel injector pump is operated by （） which drives the plunger up and down.A . a separate motorB . a camC . a generatorD . a chai

[单选题]Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily byA．heat conduction into the injected fuel oilB．heat conduction into the water jacket wallC．water circulation through passages in the holderD．fuel oil circu

[单选题]The injector pump is operated by a cam which drives （） up and down.A . the needle valveB . the plungerC . the pistonD . the cylinder