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UPSC Civil Service Exam Questions - Engineering

Q1:

The head loss in a pipe of diameter d, carrying oil at a flow rate Q over a distance l is h. The pipe is replaced by another with half the diameter, all other things remaining the same. The head loss in this case will be

A 0.5 h

B 2.0 h

C 8.0 h

D 32.0 h

ANS:D - 32.0 h

But for Laminar flow, it should be inversely proportional to D^4.

As oil is flowing so we should use the laminar flow equation.

And the answer should be 16 h.