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Environmental Engineering

Environmental Engineering
Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank

Only (iii)
Only (i)
(i) and (ii)
(i) and (iii)

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Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

5 to 10 cm/sec
15 to 30 cm/minute
15 to 30 cm/sec
15 to 30 cm/hour

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Environmental Engineering
The devices which are installed for drawing water from the sources are called

Filters
Intakes
Aquiclude
Aquifers

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Environmental Engineering
The gas from sludge digestion tank is mainly composed of

Hydrogen sulphide
Nitrogen
Carbon dioxide
Methane

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Environmental Engineering
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

R > (N + y)
N = y + R
R = N + y
y = N + R

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Environmental Engineering
The treatment of water with bleaching powder is known as

De-chlorination
Hypo-chlorination
Super chlorination
Pre-chlorination

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