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單項(xiàng)選擇題

Foaming in the steam drum may be caused by （） in a boiler.

A.oxygen in the water
B.poor boiler design
C.density too high
D.excessive steam demand

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單項(xiàng)選擇題

Too much air in the furnace of an oil-fired boiler would be indicated by （）.

A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame

單項(xiàng)選擇題

The feed water to the boiler will comprise （）.

A.condensate
B.a small amount of make-up feed
C.A and B
D.None of the above

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