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Waste Water Engineering

Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

15°C
0°C
25°C
20°C

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Waste Water Engineering
1000 kg of sewage contains

0.112 kg in solution
0.112 kg in suspension
Both A and C of above
0.225 kg in solution

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Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

Typhoid
All listed here
Dysentery
Cholera

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Waste Water Engineering
With self cleansing velocity in sewers

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

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 100
1 in 60
None of these
1 in 120

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

None of these
Centrifugal pump
Pneumatic ejector
Reciprocating pump

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