Environmental Engineering in CE
White smoke coming out of the chimney of a furnace indicates the use of

Liquid fuel in the furnace
Very high excess air
Low excess air
Gaseous fuel in the furnace

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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
It forms CO₂ by combining with oxygen present in the blood
Of clotting of blood
Of jamming of respiratory tract

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