單項選擇題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


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1.單項選擇題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

3.單項選擇題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

5.單項選擇題Turbulence in a diesel engine cylinder is of major importance in providing ().

A.proper fuel metering
B.complete fuel/air mixing
C.minimal fuel penetration
D.proper fuel timing