Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel from top surface to bottom sludge zone
A particle to travel along its length
The flow of sewage to fill the tank
None of these

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Waste Water Engineering
In case of sewer lines

Test for straightness is carried out with the help of a lamp and mirror
Obstruction test is carried out with the help of smooth ball of diameter 13 mm
Water test is carried out to check water tightness of the joints
All listed here

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

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