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Waste Water Engineering

Waste Water Engineering
House connections to the laterals is generally made by

Glazed stonewares
R.C.C.
Cast iron
P.C.C.

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Waste Water Engineering
Sewer ventilating columns are generally placed at

Distances 150 m to 300 m
Every change in the size of sewers
Upper ends of branch sewers
All listed here

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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/3
D/2
D/4
D/1

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Under estimates of maximum and average flows
All of these
Unexpected increase in the population
Unexpected large scale infiltration of stream water

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

413.5 cm/sec
313.5 cm/sec
213.5 cm/sec
500 cm/sec

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.94 D
D’ = 0.84 D
D’ = 0.74 D
D’ = 0.64 D

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