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Waste Water Engineering

Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

20
5
15
10

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

80,000 to 100,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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Waste Water Engineering
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

None of these
Centrifugal pump
Reciprocating pump
Pneumatic ejector

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Waste Water Engineering
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

Plateau
A heap
Windrow
None of these

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Waste Water Engineering
Aerobic bacterias

Consume organic matter as their food
Flourish in the presence of free oxygen
All of these
Oxidise organic matter in sewage

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Waste Water Engineering
The most widely used pump for lifting sewage is

Reciprocating pump
Centrifugal pump
Pneumatic ejector
Air pressure pump

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