单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Proper combustion in a boiler would be indicated by （）.
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
