单项选择题

If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.

A.open air-box drains
B.loss of cooling water to the diffuser
C.gradual fouling of the air filters
D.improperly timed exhaust valves

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单项选择题

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

单项选择题

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

单项选择题

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