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Waste Water Engineering

Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Neither A nor B
Comminutor
Both A and B
Shredder

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

Reciprocating pump
Centrifugal pump
Pneumatic ejector
None of these

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Waste Water Engineering
In detritus tanks,

Detention period is kept 3 to 4 minutes
Organic and inorganic materials are separated
All listed here
Flow velocity is kept 0.09 m/sec

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Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/1
D/3
D/2
D/4

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Waste Water Engineering
If the pH value of sewage is 7

It is alkaline
It is neutral
It is acidic
None of these

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Waste Water Engineering
Self-cleansing velocity is

Velocity of water at flushing
Velocity at which no accumulation remains in the drains
Velocity at dry weather flow
Velocity of water in a pressure filter

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