Waste Water Engineering
The non-clog pump which permits solid matter to pass out with the liquid sewage, is

Centrifugal pump
Reciprocating pump
Pneumatic ejector
None of these

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Waste Water Engineering
The pressure exerted by

The internal pressure if any, causes tensile stress in the pipe material
All listed here
Pressure sewers are designed to be safe in tension
The sewage when running full from inside, is called internal pressure

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