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GATE Exam Questions - Engineering

Q1:

If the pump head is 75 m, discharge is 0.464 m3/s and the motor speed is 1440 rpm at rated condition, the specific speed of the pump is about

A 4

B 26

C 38

D 1440

ANS:C - 38

Specific speed (Ns) = (N*q^1/2)/H^(3/4).
Substituting,
N=1440,
q=0.464,
H=74,
We get, Ns=38.48.