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Waste Water Engineering

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
24 m
20 m
16 m

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

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

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Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Egg shaped
Circular shaped
Parabolic shaped
Horse shoe shaped

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Waste Water Engineering
For evaporation and measurement of settable solids, the apparatus used, is

A breaker
An Imhoff cone
A jar
A test tube

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

40 to 60%
30 to 40%
60 to 80%
80 to 90%

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Waste Water Engineering
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.45 m/sec
0.30 m/sec
0.35 m/sec
0.40 m/sec

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