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Waste Water Engineering

Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Nitrogen
Sulphur-dioxide
Carbondioxide
Oxygen

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Waste Water Engineering
The intensity of rain is expressed in

cm/day
None of these
cm/hour
cm/minute

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

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

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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
Which one of the following resists hydrogen sulphide corrosion?

Glazed stone wares
Asbestos cement
R.C.C.
Glazed ware

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

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