Engineering :: Heat Engines

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If the boiler chimney emission consists of dense white smoke, then it can be concluded that

[A].	Excess air has been supplied for combustion	[B].	Insufficient air has been supplied for combustion
[C].	Chemically correct air has been supplied for combustion	[D].	Coal contains high percentage of ash
[E].	Coal contains high percentage of sulphur

Answer: Option B