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Waste Water Engineering

Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Circular shaped
Egg shaped
Horse shoe shaped
Parabolic shaped

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Waste Water Engineering
In SI units the power of sound is represented in

Kgs
Watts
Joules
Newtons

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Waste Water Engineering
Aerobic activity is maximum

At sewer pipes
In freshly produced sewage
In sewer treatment plants
None of these

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 100 upward
1 in 500 upward
1 in 503 upward
1 in 100 downward

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Waste Water Engineering
depends upon The Chezy’s constant C in the formula V = C

All listed here
Roughness of sewer surface
Size of the sewer
Shape of the sewer

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

150 mg/l
100 mg/l
50 mg/l
250 mg/l

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