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Waste Water Engineering

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
500 cm/sec
213.5 cm/sec

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

Acid regression
Alkaline fermentation
Acid fermentation
None of these

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

2 days
7 days
12 days
14 days

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Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(4 + )/(18 + )] q
Q = [(18 + )/(4 + )] q
Q = [(5 + )/((15 + )] q
Q = [(18 + P)/(4 + )] q

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Waste Water Engineering
No treatment of the sewage is given if dilution factor is

Between 150 to 200
Between 200 to 300
More than 500
Less than 150

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Waste Water Engineering
Which one of the following part of human body withstands minimum radiation?

Kidneys
Thyroid
Ovaries/testis
Eyes

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