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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
descriptionsB
discrepanciesC
differentD
deflections
考题
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
will be modulated in proportionB
will be modulated in proportion and integralC
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考题
单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）A
natural circulation of the water in the water tube boiler is better than that in the fire tube boilerB
for the same output the water tube boiler will carry less mass of water compared with the fire tube boilerC
the water tube boiler will cost shorter time for steam raisingD
the water tube boiler require lower skill in operating and maintaining
考题
单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
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
treating the boiler water with chemical oxygen scavengers
考题
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
when the boiler has been cooled to ambient temperatureC
only after raising the water level to within 0~5 inch of the high water cutout onlyD
after bypassing the low pressure
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
swellB
shrinkageC
flash offD
lack of water
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单选题A distorted furnace in a fire-tube auxiliary boiler may be the result of （）A
firing for extended periods in the low fire modeB
overheating, due to waterside depositsC
varying the water level above the crown sheetD
carrying excessive alkalinity in the boiler water
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单选题During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.A
the highestB
above 3/4C
1/2-3/4D
the lowest
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单选题When preparing an engine for water temperature（）A
should be kept at a proper level by a coolerB
should be raised to about 80℃ by a heaterC
should be raised graduallyD
should be lowered to about 60℃
考题
单选题A feed pump for an auxiliary boiler might lose suction if the （）.A
boiler water level is lowB
feedwater is too hotC
boiler steam demand is lowD
feedwater is too cold
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High oxygen concentrationB
Low pHC
Proper alkalinityD
All of the above
考题
单选题The water level in a steaming auxiliary boiler will always （）A
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
考题
单选题The water level showing in a boiler water gauge glass is usually （） during working.A
higher than the actual drum water levelB
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the highestB
above 3/4C
1/2 -3/4D
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考题
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
extinguish the fire as soon as possibleC
feed water to the boilerD
open the blow down valve
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
reduce corrosion in the heating coilC
prevent clogging and erosion in the coilD
maintain zero water hardness
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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考题
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
考题
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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