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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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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
When an auxiliary boiler is panting and emitting(发出) black smoke, you should______.A.increase the fuel oil temperatureB.decrease the fuel oil temperatureC.decrease the fuel oil supply pressureD.increase the air supply
考题
单选题When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）A
cold fuel oilB
low fuel oil pressureC
low atomizing steam pressureD
water in the fuel oil
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Black smoke coming from a boiler can be caused by （）.A
low water levelB
high water levelC
excessively high fuel pressureD
low oil temperature
考题
单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）A
relight the boiler immediately to prevent loss of steam pressureB
relight the fire off the brickwork as the bricks are cherry redC
purge the furnace of any combustible gases before attempting to relight the fireD
speed up the feed pump to prevent dry firing when the burner flame is reestablished
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 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High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.A
engine overloadB
low combustion temperatureC
plugged fuel nozzle holesD
excessive compression pressure
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 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When there is a flame failure in an automatically fired auxiliary boiler, the （）.A
air supply is shut offB
fuel supply is shut offC
water supply is shut offD
safety valve lifts
考题
单选题Exhaust pipes for separate diesel engines can be combined only when （）A
space limitations prevent separately run pipesB
the engines are small auxiliary unitsC
they are arranged to prevent gas backflow to each engineD
a waste heat boiler is installed
考题
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
考题
单选题A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）A
defective solenoid valveB
dirty fuel nozzleC
grounded high tension leadD
faulty ignition cable connector
考题
单选题The water level in a steaming auxiliary boiler will always （）A
rise when the steam pressure is increasedB
remain constant as long as the feed pump operatesC
fall when the steam pressure is decreasedD
vary as the steam demand changes
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Black smoke coming from a boiler can be caused by （）.A
low water levelB
low oil pressureC
excessively high fuel pressureD
an improper air/fuel ratio
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
考题
单选题Which action should be taken when an auxiliary boiler in is operation?（）A
Clean all electrical connectionsB
Lift the relief valves by handC
Inspect and clean all solenoid valvesD
Inspect for oil and water leaks
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