单项选择题

The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.

A.ensure feed water flow into the boiler
B.keep the steam drum pressure high
C.prevent water hammer in the feed line
D.help the feed water flash to steam

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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

单项选择题

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

A.feed pump suction line
B.hot well
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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