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Environmental Engineering

Environmental Engineering
Laying of sewers is usually done with the help of

A Theodolite
A compass
Sight rails and boning rods
A plane table

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Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

0.2 to 0.4
5 to 7
2 to 4
0.4 to 1.0

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

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

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

135 liters
100 liters
200 liters
165 liters

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Environmental Engineering
An egg shaped section of sewer

Provides self cleansing velocity at low discharges
Is economical than circular section
Is easy to construct
Is more stable than circular section

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank increases if

The depth of tank is decreased
The surface area of tank is increased
Particle size is decreased
None of these

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