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單項選擇題

Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）

A.an insufficient speed droop setting
B.an overloaded engine
C.clogged drain holes in the oil control rings
D.complete combustion

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單項選擇題

A dark exhaust from a running diesel engine can be caused by （）

A.late ignition
B.water in the fuel
C.high compression temperature
D.starting valve stuck open

單項選擇題

What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）

A.White
B.Black
C.Blue
D.Clear

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