The brickwork surrounding the firebox of a boiler is known as ______．A.RefractoryB.The screen wallC.The water wallD.Fire plate
The brickwork surrounding the firebox of a boiler is known as ______．
A.Refractory
B.The screen wall
C.The water wall
D.Fire plate
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
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
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness
A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.A.excessive purging before lighting offB.insufficient trail for ignition periodC.a faulty transformer in the ignition circuitD.insufficient purging before lighting off
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In the event of a flame failure in an auxiliary water-tube boiler, you must（）Arelight the boiler immediately to prevent loss of steam pressureBrelight the fire off the brickwork as the bricks are cherry redCpurge the furnace of any combustible gases before attempting to relight the fireDspeed up the feed pump to prevent dry firing when the burner flame is reestablished
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The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）Asalinity is abnormally highBsteam demand is too highCwater level is abnormally lowDfeedwater flow is low
单选题The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）Asteam demand is highBsalinity is highCsafety valve simmersDburner flame is extinguished
单选题A firebox explosion in an automatically fired auxiliary boiler may be the result of （）Aexcessive purging before lighting offBinsufficient trail for ignition periodCa faulty transformer in the ignition circuitDinsufficient purging before lighting off
单选题The moisture equilibrium chart can be used to determine the（）.AAbsolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium existsBDew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodityCEnthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargoDTemperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo
单选题A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.AmonkeyBdonkeyCwaste heatDmain
单选题A stream of water immediately surrounding a moving vessel’s hull，flowing in the same direction as the vessel is known as（）.Adirectional currentBforward currentCpropeller currentDwake current
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（） should be tested and adjusted when the boiler survey is carried out.AThe boiler oil tankBThe steam pipeCThe fire sideDThe safety valves
单选题Foaming in the steam drum may be caused by （） in a boiler.Aoxygen in the waterBpoor boiler designCdensity too highDexcessive steam demand
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Excessive alkalinity of the water in an auxiliary boiler can cause （）.Acaustic embrittlement of the boiler metalBacidic corrosion of the boiler metalChard scale deposits on the boiler tubesDetching of the heat exchange surfaces
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Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.A10B7C4D1
单选题The brickwork surrounding the firebox of a boiler is known as（）.ArefractoryBthe screen wallCthe water wallDfire plate