# Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : GATE Exam Questions - Section 2 (Q.No. 4)
4.
At a rated capacity of 44 Cumecs, a centrifugal pump develops 36 m of head when operating at 1450 rpm. Its specific speed is :
654
509
700
90
Explanation:
No answer description is available. Let's discuss.
Discussion:
10 comments Page 1 of 1.

Sathish said:   4 years ago
How to solve this problem? Please anyone explain in detail?
(1)

Swar said:   5 years ago
Thank you all for explaining.

Basavaraj mp said:   5 years ago
Thanks for the solution @Desinerd.

B.S.DALAL said:   5 years ago
Ns = N*√Q/H^(.75).
(1)

Vini said:   6 years ago
Specific Speed, Ns = N√Q/H^3/4.
=1450*√44/36^3/4.
(1)

Sonij said:   6 years ago
1450 * 44^(1/2)/36^(.75).
(1)

Chhaya said:   7 years ago
Thanks @Desinerd.

Vinod said:   8 years ago
Thanks @Desinerd.

Desinerd said:   10 years ago
Formula is,

Ns = n x sqrt of Q / H^(0.75).

Where:

Ns = specific speed.
n = pump rotational speed (rpm).
Q = flow (cumecs).