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

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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

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An indication of a diesel engine air intake being partially clogged, is （）.

A.low firing pressure and low exhaust temperatures
B.low firing pressure and normal exhaust temperatures
C.high firing pressure and low exhaust temperatures
D.high firing pressure and high exhaust temperatures

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The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.

A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure