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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 off
B
insufficient trail for ignition period
C
a faulty transformer in the ignition circuit
D
insufficient purging before lighting off
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考题
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
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单选题When there is a flame failure in an automatically fired auxiliary boiler, the （）.A
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safety valve lifts
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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
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单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.A
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考题
单选题The brickwork surrounding the firebox of a boiler is known as（）.A
refractoryB
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考题
单选题I’m afraid there are people in the world who literally do not know how to boil water.A
liberallyB
actuallyC
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