单项选择题

The exhaust system for a turbocharged diesel engine functions to （）

A.power the after-coolers
B.power the turbocharger
C.reduce the cylinder scavenge effect
D.cool the turbocharger

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单项选择题

If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）

A.corrosive deterioration of a bearing
B.inadequate air filtration
C.excessive ring and liner wear
D.excessive cooling of lubricating oil

单项选择题

Late fuel injection timing is indicated by （）

A.lower than normal cylinder pressure and low exhaust temperature
B.lower than normal cylinder pressure and high exhaust temperature
C.higher than normal cylinder pressure and low exhaust temperature
D.higher than normal cylinder pressure and high exhaust temperature

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The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called（）.

A.engine displacement
B.super-aspirating
C.air injection
D.supercharging