单项选择题

In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

A.steam stop valve
B.dry pipe
C.feedwater system
D.generating tubes

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单项选择题

If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to （）.

A.an overfilled expansion tank
B.excess chromate treatment of the jacket water
C.a clogged raw water sea suction
D.cavitation erosion of the heat exchanger tubes

单项选择题

The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

A.an isochronous governor
B.elastic engine mounts
C.a vibration damper
D.a cast iron bed plate with good flexible qualities