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Waste Water Engineering

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

Thyroid
Kidneys
Ovaries/testis
Eyes

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Waste Water Engineering
The non-clog pump which permits solid matter to pass out with the liquid sewage, is

Reciprocating pump
None of these
Pneumatic ejector
Centrifugal pump

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

10000
100
1000
5000

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Waste Water Engineering
15 cumecs, the depth d and width are related by For drains up to

B = 0.2 d
d = 0.5 B
d = 0.2 B
B = 0.5 d

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.01 mm
Less than 0.05 mm
Greater than 0.1 mm
Less than 0.1 mm

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Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

Anaerobic bacteria
Aerobic bacteria
None of these
Both types of bacterias

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