單項選擇題Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.

A.reduce engine horsepower output
B.aid in silencing the exhaust noise
C.increase the mean effective pressure
D.contribute to effective cylinder scavenging


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1.單項選擇題High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.

A.engine overload
B.low combustion temperature
C.plugged fuel nozzle holes
D.excessive compression pressure

2.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

3.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

4.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

5.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