更多"The needle valve in the injector （）"的相关试题:
[单项选择]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
[单项选择]Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）
A. maximum power at a normal load
B. maximum power and load under normal conditions
C. half speed and normal temperature
D. normal operating temperature without a load
[单项选择]If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
A. have a larger than normal dead band
B. produce excessive speed response to a load change
C. respond slowly to any change in engine load
D. stabilize engine speed at the new governor setting
[单项选择]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
[单项选择]If the needle valve in a fuel injection nozzle sticks open （）.
A. no fuel will be delivered through the nozzle
B. the nozzle will overheat and crack
C. time of injection will change
D. fuel will leak into the drain line
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]A defective injector nozzle in a propulsion diesel engine can cause（）
A. engine power losses
B. smoking due to unburned fuel
C. high exhaust temperature readings
D. all of the above
[单项选择]Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.
A. heat conduction into the injected fuel oil
B. heat conduction into the water jacket wall
C. water circulation through passages in the holder
D. fuel oil circulation through passages in the holder
[单项选择]A distorted spray pattern from a fuel injector can cause a diesel engine to have （）
A. higher firing pressure
B. more power output
C. lower fuel pressure
D. less power output
[单项选择]The amount of fuel delivered by a unit injector is controlled by the （）
A. camshaft
B. main spring
C. rack position
D. nozzle orifice size
[单项选择]The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A. crankshaft
B. camshaft
C. piston rod
D. rack and pinion
[单项选择]If a few injector spray holes become plugged, the result could be （）
A. excessive surging at governed speed
B. combustion knock under load
C. poor fuel combustion
D. all of the above
[单项选择]Fix the fuel injector into （） after repair.
A. the cylinder liner
B. the cylinder cover
C. the cylinder jacket
D. the piston
[单项选择]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
[单项选择]The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.
A. has begun
B. takes place
C. occurs
D. happens
[单项选择]A leaking diesel engine fuel injector will cause（）
A. prolonged maintenance intervals
B. improved atomization
C. greater fuel economy
D. incomplete combustion
[单项选择]In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）
A. the pump supply pressure
B. the slope of the fuel cam
C. how the plunger is rotated
D. the number of sleeve segments engaged with the rack
