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单选题
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
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delivering the same quantity of fuel to each cylinder for each power stroke according to engine loadB
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单选题One of function of diesel engine lubricating oil is to （）A
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单选题Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）A
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单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?（）A
The fuel metering will varyB
The fuel will explodeC
The cylinder head will crackD
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单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.A
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单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
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单选题A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）A
increase in engine speedB
increase in cylinder turbulenceC
leaking needle valveD
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单选题In the cylinder of a diesel engine fuel is ignited by the（）A
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prolong the ignition delay periodB
ensure the beginning of fuel injectionC
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allow controlled fuel combustion
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单选题Turbulence in a diesel engine cylinder is of major importance in providing （）.A
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minimal fuel penetrationD
proper fuel timing
考题
单选题Turbulence is created in the cylinders of a diesel engine to （）A
obtain injection lagB
help mix fuel and airC
increase combustion pressureD
utilize higher injection pressures
考题
单选题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）A
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单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
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单选题Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）A
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all of the above
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单选题Fuel injection systems meter fuel, atomize fuel, and （）.A
create turbulence in the combustion chamberB
aid in completing cylinder scavengingC
inject fuel at the proper timeD
minimize fuel penetration into the cylinder
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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 chamberB
ensure the needle valve is flushed clean during each injectionC
prevent combustion gas blowback into the open needle valveD
prevent reflected pressure waves when the needle valve closes
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