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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

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

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Waste Water Engineering
A drop manhole is provided if

A sewer drops from a height
None of these
A branch sewer joins the main sewer at higher level
A lamp is inserted to check obstruction

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Waste Water Engineering
The algae dies out in the zone of

Cleaner water
Degradation
Recovery
Active decomposition

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

Ammonia and nitrogen
All listed here
Nitrogen and organic nitrogen
Organic nitrogen and ammonia

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

Sulphuric acid and napthamine
None of these
Phenol-di -sulphuric acid and potassium hydroxide
Potassium permanganate

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Waste Water Engineering
The minimum diameter of a sewer is kept

20 cm
15 cm
10 cm
25 cm

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