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Environmental Engineering

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

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

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Environmental Engineering
Period of cleaning of slow sand filters is about

1 - 2 year
10 - 12 days
2 - 3 months
24 - 48 hours

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Environmental Engineering
Average rate of water consumption per head per day as per Indian Standard is

135 liters
200 liters
165 liters
100 liters

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Environmental Engineering
As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

(ii) and (iv)
(i) and (ii)
(ii) and (iii)
(i) and (iv)

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Environmental Engineering
The means of access for inspection and cleaning of sewer line is known as

Manhole
Drop manhole
Inlet
Catch basin

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Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

None of these
Equal to HMD when flowing full
Less than HMD when flowing full
Greater than HMD when flowing full

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