GATE Exam Questions - Engineering

Q1:

If a single pipe of length L and diameter D is to be replaced by three pipes of same material, same length and equal diameter d (d < D), to convey the same total discharge under the same head loss, then d and D are related by

A

B

C

D

ANS:A -

n= (D/d)^5/2.
Therefor n^2/5 =D/d,
d = D/n^2/5,
Here n=3,
Than d= D/3^2:5.