单项选择题

If in doubt as to the true water level when a boiler is being oil-fired, you should （）.

A.take no measures
B.extinguish the fire as soon as possible
C.feed water to the boiler
D.open the blow down valve

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单项选择题

The boiler feed water check valves are located on the （）

A.feed pump suction line
B.hot well
C.shell of the feed heater
D.feed lines to the boiler

单项选择题

The water level in a steaming auxiliary boiler will always （）

A.rise when the steam pressure is increased
B.remain constant as long as the feed pump operates
C.fall when the steam pressure is decreased
D.vary as the steam demand changes

单项选择题

The donkey boiler may be given a bottom blow （）

A.to raise water level
B.only while making steam
C.to remove scum
D.when fire are secured