单选题A dazzling white burner flame in the boiler furnace indicates （）.Aproper combustionBwater in the fuelCexcess airDcold fuel oil
单选题
A dazzling white burner flame in the boiler furnace indicates （）.
A
proper combustion
B
water in the fuel
C
excess air
D
cold fuel oil
参考解析
解析：
暂无解析
相关考题：
In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside. A.water-tubeB.fire-tubeC.exhaust gasD.composite
In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.Composite
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 simmers(爆发)D.burner flame is extinguished
One of the main advantages of a graphite-furnace atomizer is that（）A、It requires only very small quantities of a sampleB、It requires metal.ions in aqueous solutionC、It does not produce background emission like a flameD、It does not get hot like a flame
单选题The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）Ain the event of a flame failureBin the event of a stack fireCwhen the water level reach the crown sheetDwhen the feed pump discharge pressure drops to a preset minimum
单选题Proper combustion in a boiler would be indicated by （）.Ayellowish flameBgolden yellow flameCwhite flameDbrilliant white flame
单选题Too much air in the furnace of an oil-fired boiler would be indicated by （）.Ayellowish flameBgolden yellow flameCwhite flameDbrilliant white flame
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A smoking burner with a pulsating flame in auxiliary boiler, is an indication that the（）Afuel oil supply temperature is normalBburner electrode is incorrectly positionedCfuel／air ratio is incorrectDignition current is too low
单选题Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.Afuel pump failureBfan motor failureCincreased feedwater consumptionDdecreased boiler efficiency
单选题Failure of the burner flame in an auxiliary boiler would probably be a result of（）Awater in the fuel oilBbroken high tension leadsCincorrect electrode settingDfull fuel pressure at the nozzle
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Diesel engine waste heat boiler construction is usually of the fire-tube or（）Acyclone furnace boiler typeBdry back boiler typeCwater-tube typeDcritical circulation boiler type
单选题A dazzling white burner flame in the boiler furnace indicates （）.Aproper combustionBwater in the fuelCexcess airDcold fuel oil
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The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）Acool the furnace to prevent pre-ignitionBremove explosive vapors from the furnaceCevaporate accumulated unburned fuel oilDprovide sufficient air in the furnace to allow ignition of the fuel
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The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high （）.AwaterBvoltageCfuel pressureDsteam pressure
单选题When there is a flame failure in an automatically fired auxiliary boiler, the （）.Aair supply is shut offBfuel supply is shut offCwater supply is shut offDsafety valve lifts
单选题Ignition failure in an automatically controlled auxiliary boiler could be caused by（）Acarbon deposits on the flame scannerBhigh fuel oil temperatureClow fuel oil viscosityDhigh steam pressure
单选题A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）Adefective solenoid valveBdirty fuel nozzleCgrounded high tension leadDfaulty ignition cable connector
单选题Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）Aa burned out solenoid in the oil supply valveBhigh temperature excess airCincorrectly setting the hot-well dump valveDan incorrectly positioned burner snubber realy
单选题Heavy soot accumulations in an auxiliary boiler could be caused by（）Awater in the fuel oilBexcessive cyclingChigh fuel oil pressureDimproper burner maintenance
单选题One of the main purposes of refractories in a boiler furnace is to（）Ahelp preheat the air for the furnacesBhelp preheat the feedwaterCprotect economizer from excessive heatDprevent excessive furnace heat losses
单选题Flame failure in an automatically fired auxiliary boiler can from a/an （）Aincorrect electrode settingBincorrect nozzle positionCclogged fuel nozzleDbroken high tension lead
单选题As for a oil-fired boiler too much air would indicated by （）.Ayellowish flameBgolden yellow flameCmilky flameDbrilliant white flame
单选题The furnace of an oil fired boiler should be （） before the operating burner is lit.Afilled with waterBpurgedCcleared of airDNone of the above is true
单选题A dazzling white burner flame in the boiler furnace indicates （）.Ano combustionBdeposits in the fuelCexcessive air in the fuelDcold fuel oil