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

Centrifugal pump
Reciprocating pump
None of these
Pneumatic ejector

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

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
The depth of tank is kept equal to its width
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level

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Waste Water Engineering
The sewer pipes

Are designed for generating self-cleansing velocities at different discharge
All listed here
Carry sewage as gravity conduits
Should resist the wear and tear caused due to abrasion

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