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Waste Water Engineering

Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Circular
Rectangular
Egg shaped
Horse shoe shaped

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.022d + 0.085H)/Q
d² (0.011d + 0.785H)/Q
d (0.285d + 0.011H)/Q
d (0.785d + 0.011H)/Q

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Waste Water Engineering
The disintegrating pump in which solid matter is broken up before passing out, is

Reciprocating pump
None of these
Pneumatic ejector
Centrifugal pump

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

30 m
20 m
24 m
16 m

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Waste Water Engineering
A manhole is classified as shallow if its depth is between

0.9 to 1.20 m
0.7 to 0.9 m
0.5 to 0.7 m
0.4 to 0.5 m

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
Both (A) and (B)
Neither (A) nor (B)
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

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