网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)
单选题
A () boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
A

monkey

B

donkey

C

waste heat

D

main


参考答案

参考解析
解析: 暂无解析
更多 “单选题A () boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.A monkeyB donkeyC waste heatD main” 相关考题
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

考题 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

考题 The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(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

考题 A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures

考题 单选题The most common cause of scale formation in an auxiliary boiler is ()A concentrations of calcium sulfate in the boiler waterB fuel oil in the feed waterC improper treatment of the feed water with calcium sulfateD excessive feed water alkalinity

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 will be modulated in proportion and differentialD will not be modulated at all

考题 单选题The purpose of the safety relief valves installed on an auxiliary boiler is to ().A relieve excess fuel oil pressure during the “off” fire cycleB admit water to the dry pipeC throttle the forced draft fan output for proper combustionD reduce excess steam pressure in the boiler

考题 单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?()A The safety valve escape piping should be disconnected from the valve body and a blank insertedB The boiler vent valves should be openedC All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaksD All of the above

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In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?()A The safety valve escape piping should be disconnected from the valve body and a blank insertedB The boiler vent valves should be openedC All handhole/manhole covers should be tightened up as much as possible to preclude any leaksD All of the above

考题 单选题In an auxiliary boiler steam and water system, the highest pressure will be in the ().A steam stop valveB dry pipeC feedwater systemD generating tubes

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Bottom blow valves are installed on auxiliary water-tube boilers to ()A remove suspended and precipitated solids from the boiler waterB completely drain the boiler in an emergency situationC prevent hardened scale deposits in the water drumD remove floating impurities from the oily water surface

考题 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

考题 单选题The water in an auxiliary boiler should be tested daily for ().A dissolved oxygenB chloridesC sludgeD dissolved nitrogen

考题 单选题The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ()A salinity is abnormally highB steam demand is too highC water level is abnormally lowD feedwater flow is low

考题 单选题The water in an auxiliary boiler should be chemically tested daily for alkalinity and()A soap hardnessB nitrog encontentC chloride contentD dissolved CO2

考题 单选题The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ()A steam demand is highB salinity is highC safety valve simmersD burner flame is extinguished

考题 单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?()A High oxygen concentrationB Low pHC Proper alkalinityD All of the above

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The water in an auxiliary boiler should be tested for chloride content to determine ().A total dissolved solidsB salt contaminationC water hardnessD chlorine contamination

考题 单选题The amount of chloride content in the water of an auxiliary boiler can be reduced by()A adding hydrazineB blowing down the boilerC adding phenolphthaleinD adding a sulfite chloride scavenger

考题 单选题Excessive alkalinity of the water in an auxiliary boiler can cause ().A caustic embrittlement of the boiler metalB acidic corrosion of the boiler metalC hard scale deposits on the boiler tubesD etching of the heat exchange surfaces

考题 单选题Bottom blow valves are installed on auxiliary water-tube boilers to ()A completely drain the boiler in an emergencyB prevent sludge from forming in the drumC remove floating impurities from the boiler water surfaceD remove settled solids from the water drum

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

考题 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 ().A 10B 7C 4D 1

考题 单选题The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each().A hourB dayC weekD month