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单选题
Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.
A
carry off
B
carry down
C
carry on
D
carry over
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单选题You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.A
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单选题The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it （）A
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operating the boiler at less than normal water levelB
installing fins on the firesides of water-tubesC
increasing the amount of excess air to the burnersD
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单选题The correct procedure for giving an auxiliary boiler a bottom blow, is to begin（）A
when the boiler has been secured long enough for most solids to settleB
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考题
单选题When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.A
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单选题A distorted furnace in a fire-tube auxiliary boiler may be the result of （）A
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overheating, due to waterside depositsC
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单选题A feed pump for an auxiliary boiler might lose suction if the （）.A
boiler water level is lowB
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单选题Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.A
carry offB
carry downC
carry onD
carry over
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rise when the steam pressure is increasedB
remain constant as long as the feed pump operatesC
fall when the steam pressure is decreasedD
vary as the steam demand changes
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higher than the actual drum water levelB
equal to the actual drum water levelC
increasing due to steam condensation in the glassD
lower than actual drum water level
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the highestB
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单选题If in doubt as to the true water level when a boiler is being oil-fired, you should （）.A
take no measuresB
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考题
单选题The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）A
precipitate silica from solutionB
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考题
单选题When steam is being raised on a boiler, the water level will normally （）.A
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rise as the boiler warms upC
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单选题The water level in the gauge glass when a boiler is operating is （） when the boiler is shut down.A
lower thanB
higher thanC
belowD
equal to
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单选题When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.A
lower thanB
higher thanC
as much asD
the same as
考题
单选题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.A
high steam pressure in the boilerB
abnormally high feed water temperatureC
abnormally high boiler water temperatureD
steam demand exceeding feed pump capacity
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