Question

If the diameter of pumping mains decreases, then the total dynamic head will increase.

(a) True

(b) False

I had been asked this question during a job interview.

I would like to ask this question from Selection of Pumping Units in portion Pumps and Pumping of Environmental Engineering

Answer 1

The correct answer is (a) True

Easiest explanation: If the diameter of pumping mains decreases, then the velocity of flow will increase for a given fixed discharge resulting in the increase of friction head loss and velocity head and ultimately increases the total dynamic head.