Waste Water Engineering
Rate of flow of sewage is generally assumed

Equal to the rate of water supply
Less than the rate of water supply
At 150 litres per capita
More than the rate of water supply

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Waste Water Engineering
Which one of the following statements regarding septic tanks is wrong?

The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
The minimum width of septic level is 90 cm
The depth of tank is kept equal to its width

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The men entering the manhole should be advised to smoke in the sewer
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Warning signals should be erected
Proper tests for the presence of poisonous gases must be carried out

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