Question 56Steam 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 MOST complete combustion and HIGHEST boiler efficiency?
ALight brown haze
BClear stack
CWhite smoke
DBlack smoke
AI Explanation
The correct answer is A) Light brown haze. A light brown haze from the stack indicates the most complete combustion and highest boiler efficiency. This is because complete combustion results in minimal unburnt fuel particles, leading to a light-colored, almost transparent exhaust plume. In contrast, incomplete combustion produces byproducts like soot and unburnt fuel, resulting in a darker, more opaque stack appearance. B, C, and D are incorrect because they indicate incomplete combustion and lower boiler efficiency. A clear stack could mean the boiler is not operating, white smoke suggests incomplete vaporization of fuel, and black smoke indicates excessive unburnt fuel particles.
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