单项选择题

An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）

A.restricted turbocharger air intake
B.oil leak into the turbocharger
C.dribbling injector
D.low fuel viscosity

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单项选择题

The exhaust valve opens before bottom dead center in a four stroke engine to（）
Ⅰ.allow for blow down
Ⅱ.Reduce pumping losses

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ

单项选择题

Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）

A.Constant volume
B.Constant pressure
C.Pulse pressure
D.Radial flow

单项选择题

Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（）

A.Water discharging from the water outlet of the lube oil purifier
B.Fuel oil discharging from the water outlet of the lube oil purifier
C.Lube oil discharging from the water outlet of the lube oil purifier
D.A change in the lube oil viscosity