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Waste Water Engineering

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

Kidneys
Eyes
Ovaries/testis
Thyroid

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Waste Water Engineering
In areas where rainy season is limited to a few months, the type of sewerage system recommended is

Partially separate system
Combined system
Separate system
None of these

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.20 cumec
0.10 cumec
0.12 cumec
0.15 cumec

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel along its length
The flow of sewage to fill the tank
A particle to travel from top surface to bottom sludge zone
None of these

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

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

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Waste Water Engineering
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

50 cm c/c
22.5 cm c/c
15 cm c/c
30 cm c/c

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