更多"It should be evident that the amoun"的相关试题:
[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]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 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 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
[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 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 valves should be taken out, cleaned, and lifting checked every （）.
A. two to four months
B. four to six months
C. six to eight months
[单项选择]Before being used the fuel service tank should be drained of （）.
A. soda solution
B. mechanical impurities
C. ballast
D. water and residuals
[单项选择]A centrifugal fuel oil purifier should be shut down if （）
A. more sealing water is needed
B. the cover clamp needs tightening
C. the purifier has a bad vibration when started
D. water is discharged from the overflow line
[单项选择]Gasoline fuel tank vents should terminate（）.
A. in the engine compartment
B. in the fuel tank space
C. above or outside the hull
D. at the most convenient location
[单项选择]Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubrication increased （） the risk of seizure.
A. to protect
B. to guard
C. to maximize
D. to minimize
[单项选择]The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）
A. for atomizing
B. for centrifuging
C. in a storage tank
D. in the re-circulating line
[单项选择]After taking on fuel oil, the hoses should be disconnected and （）.
A. draped over the fantail to dry out
B. drained over the side and washed out
C. drained into the bilges and washed out
D. drained into buckets or fuel tanks
[单项选择]The fuel pipes and ducts should be blown with （）.
A. atmosphere
B. the fresh water
C. compressed air
D. chemical compounds
[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
[单项选择]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
