Question 54Steam Plants - QMED
70% to passIn terms of the completeness of combustion, in viewing the condition of the stack, what would be the indication of the LEAST complete combustion and LOWEST boiler efficiency?
ABlack smoke
BWhite smoke
CClear stack
DLight brown haze
AI Explanation
The correct answer is A) Black smoke. Black smoke is an indication of the LEAST complete combustion and LOWEST boiler efficiency. This is because black smoke is produced when the fuel is not burning efficiently, resulting in unburnt carbon particles being emitted from the stack. Incomplete combustion leads to a loss of energy and lower boiler efficiency. In contrast, white smoke indicates complete combustion, while a clear stack and light brown haze are not as indicative of combustion efficiency as black smoke.
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