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41
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
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Answer: Option B
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42
The porosity of sediments in sewer pipes, is usually taken as
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Answer: Option D
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43
The sludge does not contain waste water from
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Answer: Option D
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44
Dry weather flow is:
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Answer: Option D
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45
The pH value of sewage is determined with the help of
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Answer: Option C
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46
Drop manholes at the junctions of sewer lines, are provided if
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Answer: Option A
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47
It is customary to design a sewer for D.W.F. on the basis of
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Answer: Option C
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48
In trickling filter, B.O.D. is reduced to
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Answer: Option C
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49
The value of Chezy’s constant $${\text{C}} = \frac{{157.6}}{{1.81 + \frac{{\text{K}}}{{\sqrt {\text{m}} }}}}$$    is used in
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Answer: Option B
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50
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
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Answer: Option C
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