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Waste Water Engineering

Waste Water Engineering
For house drainage minimum gradient is

1 in 10
1 in 80
1 in 60
1 in 400

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Waste Water Engineering
With self cleansing velocity in sewers

Silting occurs at bottom
Neither silting nor scouring occurs at bottom
Scouring occurs at bottom
Both silting and scouring occur at bottom

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Waste Water Engineering
The non-clog pump which permits solid matter to pass out with the liquid sewage, is

Pneumatic ejector
None of these
Centrifugal pump
Reciprocating pump

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Waste Water Engineering
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by

Lloyd Davis
Kinchling
All listed here
Frubling

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.05 mm
Greater than 0.1 mm
Less than 0.01 mm
Less than 0.1 mm

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

5 ppm
10 ppm
4 ppm
3 ppm

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