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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 off
B
fuel supply is shut off
C
water supply is shut off
D
safety valve lifts
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单选题Excessive vibration of an automatically fired auxiliary boiler can be caused by （）A
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单选题Ignition failure in an automatically controlled auxiliary boiler could be caused by（）A
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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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increased fuel consumptionB
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单选题Flame failure in an automatically fired auxiliary boiler can from a/an （）A
incorrect electrode settingB
incorrect nozzle positionC
clogged fuel nozzleD
broken high tension lead
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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
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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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