單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題In a diesel engine, blow-by（）

A.increase exhaust back pressure
B.causes excessive crankcase pressure
C.can only be detected by a compression check
D.decreases fuel consumption

5.單項選擇題A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）

A.fuel droplets will burn as they leave the fuel injector
B.fuel will not be properly atomized in the cylinder
C.maximum expansion of the burned fuel cannot take place in the cylinder
D.compression pressure will be too low to cause fuel ignition