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Waste Water Engineering

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

Thyroid
Eyes
Kidneys
Ovaries/testis

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Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

Slightly more than 5% of the design discharge
20% of the design discharge
Slightly less than 5% of the design discharge
None of these

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

60 days
20 days
10 days
30 days

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

HNO₃
None of these
HCl
H₂SO₄

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Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.55
2.25
2.5
2.65

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Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

2000 litres/km/cm
500 litres/km/cm
1500 litres/km/cm
1000 litres/km/cm

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