Question

Most commonly used pump for lifting water in water supply mains, is _________

(a) axial-flow pump

(b) reciprocating pump

(c) rotary type pump

(d) centrifugal pump

The question was asked during a job interview.

I need to ask this question from Water Supply, Electrical and Road Work in section Rules and Methods of Measurement of Civil Engineering Drawing

Answer 1

Correct answer is (a) axial-flow pump

To explain I would say: An axial flow pump, or AFP, is a common type of pump that essentially consists of a propeller in a pipe. The propeller can be driven directly by a sealed motor in the pipe or mounted to the pipe from the outside or by a right-angle drive shaft that pierces the pipe.

 Fluid particles, in course of their flow through the pump, do not change their radial locations since the change in radius at the entry (called ‘suction’) and the exit (called ‘discharge’) of the pump is very small. Hence the name “axial” pump.