Environmental Engineering in CE
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen
Of jamming of respiratory tract
It forms CO₂ by combining with oxygen present in the blood
Of clotting of blood

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Environmental Engineering in CE
Smoke is produced due to

All of these
Poor quality of fuel and improper mixing of fuel & combustion air
Insufficient supply of combustion air and insufficient time for combustion
Poor design & overloading of furnace

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