单项选择题

A dry-type exhaust muffler clogged with soot, will cause（）

A.low exhaust temperature
B.loss of engine power
C.burned intake valves
D.engine racing

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单项选择题

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

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

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