單項選擇題

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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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

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

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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 （）.

你可能感興趣的試題

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

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