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單項選擇題

Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）

A.Non-harmonic speed
B.Critical speed
C.Maximum speed
D.Design maximum speed

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單項選擇題

A dirty fuel oil filter is can be detected by （）
Ⅰ.fuel oil analysis
Ⅱ.observing the pressure drop across the filter

A.Ⅰonly
B.Ⅱonly
C.eitherⅠorⅡ
D.neitherⅠnor

單項選擇題

The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）

A.increase the density of the intake air
B.decrease turbocharger power usage
C.reduce exhaust gas temperature
D.compensate for turbocharger PRM fluctuations

Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）

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A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter

The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）

A dirty fuel oil filter is can be detected by （）
Ⅰ.fuel oil analysis
Ⅱ.observing the pressure drop across the filter