單項選擇題

The most common cause of scale formation in an auxiliary boiler is （）

A.concentrations of calcium sulfate in the boiler water
B.fuel oil in the feed water
C.improper treatment of the feed water with calcium sulfate
D.excessive feed water alkalinity

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單項選擇題

For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）

A.High oxygen concentration
B.Low pH
C.Proper alkalinity
D.All of the above

單項選擇題

If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

A.525 RPM
B.775 RPM
C.1550 RPM
D.1800 RPM

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