單項選擇題

Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? （）

A.Viscosity is decreased
B.Octane number is altered
C.Pump speed is decreased
D.Blower’s speed is decreased

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It is easier to replace a dry cylinder liner than a wet one because（）

A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall

單項選擇題

Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?（）

A.Constant pressure
B.Pulse
C.constant velocity
D.Axial flow