單項選擇題

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

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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

單項選擇題

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