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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

0.002
4.8
0.2
1.2

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Environmental Engineering in CE
Which of the following is not a source of ozone emission in the atmosphere?

Xerox machines
High voltage electrical equipments
Dermatological photo-therapy equipments
Refrigerators

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

105
95
35
75

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Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

400
20
100
200

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

Troposphere
Ionosphere
None of these
Stratosphere

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Environmental Engineering in CE
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

Total solids
All of these
Color (Hazen)
Turbidity

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