If the sewage contains grease and fatty oils, these are removed in_________________?

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The settling velocity of a particle in a sedimentation tank increases if______________?

A. particle size is decreased B. the surface area of tank is increased C. the depth of tank is decreased D. none of the above...

Which of the following sewers is preferred for combined system of sewage ?

A. circular sewer B. egg shaped sewer C. rectangular sewer D. none of the above...

A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?

A. vent pipe B. antisiphonage pipe C. waste pipe D. soil pipe...

The ratio of 5 day BOD to ultimate BOD is about_______________?

A. 1/3 B. 2/3 C. 3/4 D. 1.0...

The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?

A. arithmetical increase method B. geometrical increase method C. incremental increase method D. graphical method...