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Environmental Engineering in CE

Environmental Engineering in CE
The main type of sludge gas evolved during sewage treatment in Imhoff tank is

CO₂
CH₄
CO
H₂

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Environmental Engineering in CE
Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?

Cyclone separator
Bag filter
Dust catcher (gravity type)
Hollow wet scrubber

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Environmental Engineering in CE
Growth of __________ is promoted by the presence of manganese in water.

Micro-organisms
Algae
Files
Mosquitoes

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

Lime
Copper sulphate
Hydrochloric acid
Sodium sulphate

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Environmental Engineering in CE
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Ra-226
I-131
Au-198
Sr-90

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Environmental Engineering in CE
Which of the following is a green house gas other than CO₂ ?

Nitrous oxide
Chlorofluro carbons (CFC)
Methane
All of these

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