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Environmental Engineering in CE

Environmental Engineering in CE
The principal gas evolved from sludge digestion tank is

N₂
CH₄
CO
CO₂

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Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Sodium sulphate
Hydrochloric acid
Lime
Copper sulphate

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Environmental Engineering in CE
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

None of these
Ortho-xylene
Coal ash
Potassium cyanide

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

2000
50
5
5000

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Ammonia
Acetylene
Carbon monoxide
Hydrogen

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Environmental Engineering in CE
80% less than 200 mesh size particles are called

Aggregates
Smoke
Powder
Grit

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MORE MCQ ON Environmental Engineering in CE

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