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Environmental Engineering in CE

Environmental Engineering in CE
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

Parasitic
Anaerobic
Saphrophytic
Aerobic

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Environmental Engineering in CE
Aerosols present in atmospheric air may be

Negatively charged
Combination of all A, B & C
Positively charged
Neutral

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

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

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Environmental Engineering in CE
In water treatment, alum[Al2(SO₄)3] is used for the process of

Coagulation
Filtration
Disinfection
Sedimentation

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

0.2
1.2
0.002
4.8

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Environmental Engineering in CE
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

5000
2000
1000
50

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