更多"In a unit injector the amount of fu"的相关试题:
[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 amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）
A. the firing pressure in the cylinder
B. a metering helix inside the pump
C. varying the physical length of the plunger stroke
D. varying the clearance between the injector cam and the injector rocker arm
[单项选择]The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）
A. varying the pump discharge pressure
B. varying the pump return pressure
C. rotation of the pump plunger
D. rotation of the pump barrel
[单项选择]The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.
A. metering
B. timing
C. rate of injection
D. rate of distribution
[单项选择]It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.
A. inlet port
B. exhaust port
C. spill port
D. scavenge port
[单项选择]The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）
A. Proper timing
B. Accurate metering
C. Suitable injection rate
D. Suitable atomization rate
[单项选择]In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward 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
[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]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 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]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]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]The fuel injector pump is operated by （） which drives the plunger up and down.
A. a separate motor
B. a cam
C. a generator
D. a chain
[单项选择]Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the（）.
A. landing area and sources of vapor ignition
B. main deck
C. engine room
D. drill floor
[单项选择]With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the （）.
A. ship draft
B. pitch
C. engine load
D. oil viscosity
[单项选择]With （） unit the timing of fuel injection of an engine can be regulated automatically.
A. MBT
B. MEG
C. VSG
D. VIT
[单项选择]The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.
A. quantity of fuel to be received
B. flash point of the fuel as it is received
C. fuel temperature as it is received
D. viscosity of the fuel being received
[单项选择]Fuel injection systems meter fuel, atomize fuel, and （）.
A. create turbulence in the combustion chamber
B. aid in completing cylinder scavenging
C. inject fuel at the proper time
D. minimize fuel penetration into the cylinder
