UPSC Civil Service Exam Questions

Q1: Water is to be pumped at the rate of 0.025 m3/s from a 4 m deep ground level tank to an overhead tank. The difference in levels of the full tank levels of these tanks is 16 m. What is the approximate power required for operating a 65% efficient centrifugal pump ?

A 7.5 kW

B 6.0 kW

C 3.9 kW

D 3.2 kW

ANS:C - 3.9 kW

According to me, the right answer is A.
P = pghQ/n.
= 9810 x 20 x .025/.65.
= 7.5.



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