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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is the most severe air pollutant?

CO
NOx
SO₂
Hydrocarbons

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Environmental Engineering in CE
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Both A & B
With greater number of blades
Neither A nor B
Of increased diameter

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Environmental Engineering in CE
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?

Benzopyrene
Peroxyacyl nitrate
Carbon monoxide
Sulphur dioxide

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Only (iii)
Only (i)
Both (i) and (iii)
Both (i) and (ii)

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Environmental Engineering in CE
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

Both A & B
Neither A nor B
Shear forces
Reynold stresses

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Environmental Engineering in CE
Nitrogen oxides (NOx) is not produced in the __________ industry.

Detergent
Nitrogenous fertiliser
Nitric acid making
Any of these

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