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单选题
Proper combustion in a boiler would be indicated by （）.
A
yellowish flame
B
golden yellow flame
C
white flame
D
brilliant white flame
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单选题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.A
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单选题A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）A
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recover heat which otherwise would be lostD
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furnace to be re-purgedB
electric charge to buildup in the igniterC
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dram level to stabilize
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create turbulence in the combustion chamberB
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minimize fuel penetration into the cylinder
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yellowish flameB
golden yellow flameC
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injection pressureB
shape of combustion spaceC
turbulence in combustion spaceD
all of the above
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