單項(xiàng)選擇題A distorted spray pattern from a fuel injector can cause a diesel engine to have （）

A.higher firing pressure
B.more power output
C.lower fuel pressure
D.less power output


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1.單項(xiàng)選擇題Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）

A.The chromium will not wear out the piston rings
B.The chromium strengthens the liners in the way of the scavenging air ports
C.Chromium eliminates the need for oil scraper rings
D.Pores in the plating aid in maintaining the lube oil film

2.單項(xiàng)選擇題If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）

A.decrease until the engine speed increases
B.increase as the load increases
C.decrease as the load
D.increases remain unchanged

4.單項(xiàng)選擇題Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）

A.Lube oil is diluted and its viscosity is reduced
B.Sulfuric acid is formed
C.Bearings become pitted ad immediately fail
D.Valve stems develop sludge deposits

5.單項(xiàng)選擇題If a few injector spray holes become plugged, the result could be （）

A.excessive surging at governed speed
B.combustion knock under load
C.poor fuel combustion
D.all of the above