單項(xiàng)選擇題The longer the ignition delay period occurs in a diesel engine, the ().

A.less fuel will enter the cylinder
B.lower will be cylinder compression temperatures
C.more complete will be fuel combustion
D.more rapid will be the rise in combustion pressure


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1.單項(xiàng)選擇題Poor combustion in a diesel engine can be caused by ().

A.high compression pressure
B.low intake air temperature
C.low exhaust pressure
D.high scavenge air pressure

2.單項(xiàng)選擇題High firing pressures and a low exhaust temperature in a diesel engine may result from ().

A.decreased piston to cylinder head clearance
B.increased exhaust system back pressure
C.early fuel injection timing
D.low scavenge air temperature

3.單項(xiàng)選擇題Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a ().

A.high temperature and a high viscosity
B.high temperature and a low viscosity
C.low temperature and a high viscosity
D.low temperature and a low viscosity

5.單項(xiàng)選擇題Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?()

A.The amount of fuel injected will be increased
B.The start of injection will be retarded
C.The nozzle will permit fuel to dribble
D.The spray pattern will be distorted