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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of oxidised sewage is about

6.2
7.3
13.4
1.8

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Environmental Engineering in CE
Pick out the one which is not a chemical coagulant.

Hydrated lime
Ferrous sulphate
Aluminium sulphate
Chloramine

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Environmental Engineering in CE
Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

Electrostatic precipitator
Bag filter
Gravity settling chamber
Cyclone separator

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

Color (Hazen)
Turbidity
All of these
Total solids

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Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Highly
Moderately
Very extremely
Extremely

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Environmental Engineering in CE
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

Photochemical reaction in polluted atmosphere
Burning of domestic fuel
Automobiles exhaust
Industrial chimney exhaust

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