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Waste Water Engineering

Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

15°C
0°C
20°C
25°C

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Phenol-di-sulphuric acid
Adding sulphuric acid
Boiling
Adding potassium permanganate

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Length of the tank is normally kept 4 to 5 times the width
Width of the tank is normally kept about 6 m
All listed here
Maximum horizontal flow velocity is limited to 0.3 m/minute

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

Thyroid
Ovaries/testis
Kidneys
Eyes

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Waste Water Engineering
The standard B.O.D. of water is taken for

1 day
3 days
2 days
5 days

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

1.5
4
3
2

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