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Waste Water Engineering

Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

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

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Waste Water Engineering
In sewers the effect of scouring is more on

Bottom side
Top side
Horizontal side
All sides

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Waste Water Engineering
Aerobic bacterias

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

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.1 mm
Less than 0.01 mm
Less than 0.05 mm
Greater than 0.1 mm

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Waste Water Engineering
For drainage pipes in buildings the test applied before putting them to use, is

Water test
All listed here
Smoke test
Straightness test

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Stone ware sewers
Glazed bricks sewers
Cement concrete sewers
Cast iron sewers

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