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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is a secondary air pollutant?

Dust particles
Photochemical smog
Nitrogen dioxide
Sulphur dioxide

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Environmental Engineering in CE
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

t = 15 - 0.0035h
t = 0.0035h -15
t = 15 - 0.0065h
t = 15 + 0.0065h

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Environmental Engineering in CE
Dust collection efficiency of a cyclone separator depends upon its

Overall height
All of these
Inlet gas velocity
Diameter

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Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

50
80
25
120

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Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

15-20
43832
25-30
43961

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

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

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