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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

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

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2
1.5
3
2.5

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Waste Water Engineering
Drop manholes are the manholes

Without entry ladders
Without manhole covers
With depths more than 3.5 m
Having drains at different levels

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Waste Water Engineering
An inverted siphon is designed generally for

One pipe
Two pipes
Four pipes
Three pipes

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Hydrogen sulphide
Methane
Carbon dioxide
Oxygen

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

Acid fermentation
Acid regression
None of these
Alkaline fermentation

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