單項選擇題In a turbocharger, inlet air velocity is increased in the（）.

A.inlet nozzle ring
B.stationary diffuser passages
C.compressor outlet volute
D.rotating impeller vanes


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1.單項選擇題Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.

A.excessive fuel nozzle holder cooling
B.sediment in the fuel supply
C.distortion of the fuel spray pattern
D.improper atomization of the fuel

2.單項選擇題When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will（）

A.lag behind the increased fuel supplied to the engine
B.enter the engine along with the increase in the fuel
C.enter the engine before the increased fuel supply
D.leave the turbocharger as a negative pulse

3.單項選擇題After changing out the fuel filters the diesel engine fails to restart, the most probable cause for this condition is a/an（）.

A.low compression
B.air-bound fuel system
C.improper spark
D.change in viscosity

4.單項選擇題If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）

A.insufficient fuel supply
B.faulty governor
C.high exhaust back pressure
D.all of the above may cause this problem

5.單項選擇題Air in the fuel can cause（）

A.high lube oil temperature
B.blue smoke
C.the engine to stop
D.piston seizure