Which of the following is the most common pump for pumping either raw sewage or sludge ?

A. Require less space
B. Have quieter operation
C. Have lower operating costs
D. All A., B. and C.

A. Venturimeter
B. Pressure gauge
C. Pitot tube
D. Orificemeter

A. Drag co-efficient
B. Froude number
C. Galileo number
D. Weber number

A. Less power than
B. More power than
C. Same power as
D. Data insufficient to predict

A. Fanning’s
B. Ergun’s
C. Hagen-Poiseuille’s
D. None of these

A. Size
B. Surface properties
C. Both A. and B.
D. Neither A. nor B.