Environmental Engineering in CE
High noise levels produced during operation of fans and compressors can be reduced by using

None of these
Accoustical absorbent
Lagging of noisy duct
Mufflers (silencers)

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

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