单项选择题

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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热门试题

单项选择题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

单项选择题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

单项选择题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

单项选择题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

单项选择题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