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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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 -
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
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C.both Ⅰ and Ⅱ
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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
