單項選擇題On most diesel engines, the governor controls the output speed by ().

A.controlling the amount of fuel injected into the cylinders
B.varying the speed of the turbocharger
C.adjusting the compression ratio
D.changing the timing of the fuel injection camshaft


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1.單項選擇題Which of the following devices is common to both mechanical and hydraulic governors?()

A.Direct linkage between the ball-head and fuel rack
B.A servomotor
C.A compensating device
D.Flyweights

2.單項選擇題Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?()

A.Stationary
B.Full floating
C.Semi-floating
D.Free rolling

3.單項選擇題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

4.單項選擇題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

5.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