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Environmental Engineering in CE

Environmental Engineering in CE
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram)

10
750
800
90

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Dust
Powder
Grit
Smoke

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Environmental Engineering in CE
Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as

Benzopyrene
Poly acrylonitrile
Peroxy acetyl nitrate (PAN) or methyl nitrile
Photochemical smog

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Environmental Engineering in CE
Threshold limit value (TLV) of CO in air is __________ ppm.

5
5000
2000
50

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Environmental Engineering in CE
TLV of mercury in potable (drinking) water is about __________ ppm.

1
0.001
0.1
5

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Environmental Engineering in CE
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

125
145
105
85

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