单选题If in doubt as to the true water level when a boiler is being oil-fired, you should （）.Atake no measuresBextinguish the fire as soon as possibleCfeed water to the boilerDopen the blow down valve
单选题
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
参考解析
解析：
暂无解析
相关考题：
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
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
The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler() A.salinity is abnormallyB.high steam demand is tooC.feed-water flow is lowD.water level is abnormally low
The water level showing in a boiler water gauge glass is usually ( ) duringworking.A.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 wafer level
what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.A.high steam pressure in the boilerB.abnormally high feed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding feed pump capacity
Which statement about the inert gas system is TRUE ________．A.Boiler soot blowers should never be used when the IG system is operatingB.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very lightC.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very lightD.Flue gas with excessive oxygen content is de-oxygenated in the scrubber
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.AdescriptionsBdiscrepanciesCdifferentDdeflections
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 （）Awill be modulated in proportionBwill be modulated in proportion and integralCwill be modulated in proportion and differentialDwill not be modulated at all
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（）Arise quicklyBrise slowlyCdrop quicklyDdrop slowly
单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）Anatural circulation of the water in the water tube boiler is better than that in the fire tube boilerBfor the same output the water tube boiler will carry less mass of water compared with the fire tube boilerCthe water tube boiler will cost shorter time for steam raisingDthe water tube boiler require lower skill in operating and maintaining
单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.Aoperating the boiler at less than normal water levelBinstalling fins on the firesides of water-tubesCincreasing the amount of excess air to the burnersDtreating the boiler water with chemical oxygen scavengers
单选题The correct procedure for giving an auxiliary boiler a bottom blow, is to begin（）Awhen the boiler has been secured long enough for most solids to settleBwhen the boiler has been cooled to ambient temperatureConly after raising the water level to within 0~5 inch of the high water cutout onlyDafter bypassing the low pressure
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 （）.AswellBshrinkageCflash offDlack of water
单选题A distorted furnace in a fire-tube auxiliary boiler may be the result of （）Afiring for extended periods in the low fire modeBoverheating, due to waterside depositsCvarying the water level above the crown sheetDcarrying excessive alkalinity in the boiler water
单选题In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.Awater-tubeBfire-tubeCexhaust gasDNone of the above is true
单选题A feed pump for an auxiliary boiler might lose suction if the （）.Aboiler water level is lowBfeedwater is too hotCboiler steam demand is lowDfeedwater is too cold
单选题Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.Acarry offBcarry downCcarry onDcarry over
单选题The water level in a steaming auxiliary boiler will always （）Arise when the steam pressure is increasedBremain constant as long as the feed pump operatesCfall when the steam pressure is decreasedDvary as the steam demand changes
单选题The water level showing in a boiler water gauge glass is usually （） during working.Ahigher than the actual drum water levelBequal to the actual drum water levelCincreasing due to steam condensation in the glassDlower than actual drum water level
单选题If in doubt as to the true water level when a boiler is being oil-fired, you should （）.Atake no measuresBextinguish the fire as soon as possibleCfeed water to the boilerDopen the blow down valve
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（）Aprecipitate silica from solutionBreduce corrosion in the heating coilCprevent clogging and erosion in the coilDmaintain zero water hardness
单选题When steam is being raised on a boiler, the water level will normally （）.Adrop as the boiler warms upBrise as the boiler warms upCremain unchanged until the boiler is hot enoughDrise and fall with the steam demand
单选题The water level in the gauge glass when a boiler is operating is （） when the boiler is shut down.Alower thanBhigher thanCbelowDequal to
单选题When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.Alower thanBhigher thanCas much asDthe same as
单选题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.Ahigh steam pressure in the boilerBabnormally high feed water temperatureCabnormally high boiler water temperatureDsteam demand exceeding feed pump capacity
单选题Which action should be taken when an auxiliary boiler in is operation?（）AClean all electrical connectionsBLift the relief valves by handCInspect and clean all solenoid valvesDInspect for oil and water leaks