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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1000
1,00,000
4,00,000
4000

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Environmental Engineering
An egg shaped section of sewer

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

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Environmental Engineering
Ground water is usually free from

None of these
Suspended impurities
Both suspended and dissolved impurities
Dissolved impurities

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

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

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Environmental Engineering
The self cleansing velocity for all sewers in India is usually

1.0 m/sec to 1.2 m/sec
3.0 m/sec to 3.5 m/sec
Less than 1.0 m/sec
1.5 m/sec to 2.0 m/sec

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Environmental Engineering
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

10.5 to 12.0
8.5 to 10.0
6.5 to 8.0
4.5 to 6.0

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