单选题When an auxiliary boiler is panting and emitting black smoke, you should （）.Aincrease the fuel oil temperatureBdecrease the fuel oil temperatureCdecrease the fuel oil supply pressureDincrease the air supply
单选题
When an auxiliary boiler is panting and emitting black smoke, you should （）.
A
increase the fuel oil temperature
B
decrease the fuel oil temperature
C
decrease the fuel oil supply pressure
D
increase the air supply
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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
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
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单选题When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）Acold fuel oilBlow fuel oil pressureClow atomizing steam pressureDwater in the fuel oil
单选题The most common cause of scale formation in an auxiliary boiler is （）Aconcentrations of calcium sulfate in the boiler waterBfuel oil in the feed waterCimproper treatment of the feed water with calcium sulfateDexcessive feed water alkalinity
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Black smoke coming from a boiler can be caused by （）.Alow water levelBhigh water levelCexcessively high fuel pressureDlow oil temperature
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In an auxiliary boiler steam and water system, the highest pressure will be in the （）.Asteam stop valveBdry pipeCfeedwater systemDgenerating tubes
单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.Aengine overloadBlow combustion temperatureCplugged fuel nozzle holesDexcessive compression pressure
单选题The water in an auxiliary boiler should be tested daily for （）.Adissolved oxygenBchloridesCsludgeDdissolved nitrogen
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
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单选题The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.AhourBdayCweekDmonth
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