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单选题
When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）
A
rise quickly
B
rise slowly
C
drop quickly
D
drop slowly
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rise quicklyB
rise slowlyC
drop quicklyD
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it will be preceded by a sudden decrease in wind speedC
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单选题A feed pump for an auxiliary boiler might lose suction if the （）.A
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考题
单选题The water level in a steaming auxiliary boiler will always （）A
rise when the steam pressure is increasedB
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oxygen in the waterB
poor boiler designC
density too highD
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wheneverB
howeverC
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单选题When steam is being raised on a boiler, the water level will normally （）.A
drop as the boiler warms upB
rise as the boiler warms upC
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rise and fall with the steam demand
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offB
awayC
overD
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protect themselves from smokeB
obtain the best available airC
allow the heat and steam to pass overheadD
All of the above
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acts as an emergency shutdown when inlet pressures exceed the safe working pressureC
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relieves sudden large overpressures in the system
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