Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
(A) Low amount of excess combustion air
(B) Large quantity of excess combustion air
(C) Hydrocarbon fuel
(D) Pulverised coal as fuel
Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
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