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Environmental Engineering in CE

Environmental Engineering in CE
Main pollutant present in automobile exhaust is

CO
NO
Hydrocarbons
CO₂

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Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

100
5
1000
2000

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Environmental Engineering in CE
Smog is

A combination of smoke and fog
A liquid particle resulting from vapor condensation
A solid particle e.g. flyash
Nothing but black smoke

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Environmental Engineering in CE
Ionisation potential employed in the industrial electrostatic precipitator is of the order of

230 V DC
230 V AC
30 to 70 kV AC
30 to 70 kV DC

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

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Deaeration of feed water
All of these
Enhancing pH of feed water by adding alkali
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion

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