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单选题
Flame failure in an automatically fired auxiliary boiler can from a/an （）
A
incorrect electrode setting
B
incorrect nozzle position
C
clogged fuel nozzle
D
broken high tension lead
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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（）A
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in the event of a stack fireC
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单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）A
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relight the fire off the brickwork as the bricks are cherry redC
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speed up the feed pump to prevent dry firing when the burner flame is reestablished
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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
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单选题A smoking burner with a pulsating flame in auxiliary boiler, is an indication that the（）A
fuel oil supply temperature is normalB
burner electrode is incorrectly positionedC
fuel／air ratio is incorrectD
ignition current is too low
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单选题Failure of the burner flame in an auxiliary boiler would probably be a result of（）A
water in the fuel oilB
broken high tension leadsC
incorrect electrode settingD
full fuel pressure at the nozzle
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单选题In the event of failure of an auxiliary such as a lubricating pump, the standby pump is started and put on the line automatically“the line” in this sentence refers to（）A
fuel manifoldB
lubricating pipe lineC
auxiliary engine pipe lineD
generator output line
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单选题The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）A
cool the furnace to prevent pre-ignitionB
remove explosive vapors from the furnaceC
evaporate accumulated unburned fuel oilD
provide sufficient air in the furnace to allow ignition of the fuel
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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
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单选题The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）A
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单选题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
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单选题The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high （）.A
waterB
voltageC
fuel pressureD
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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
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space limitations prevent separately run pipesB
the engines are small auxiliary unitsC
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单选题A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.A
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单选题Excessive vibration of an automatically fired auxiliary boiler can be caused by （）A
air or water in the furnaceB
combustion pulsesC
fuel oil pump failureD
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单选题Ignition failure in an automatically controlled auxiliary boiler could be caused by（）A
carbon deposits on the flame scannerB
high fuel oil temperatureC
low fuel oil viscosityD
high steam pressure
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单选题Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）A
a burned out solenoid in the oil supply valveB
high temperature excess airC
incorrectly setting the hot-well dump valveD
an incorrectly positioned burner snubber realy
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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
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单选题Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）A
increased fuel consumptionB
increased feed water consumptionC
fuel pump failureD
combustion control system failure
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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Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.A
check and regulate the water levelB
close the air cock once fires are litC
blowdown the gage glassD
crack the steam stop to assure protective steam flow
考题
单选题As for a oil-fired boiler too much air would indicated by （）.A
yellowish flameB
golden yellow flameC
milky flameD
brilliant white flame
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