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GATE Exam Questions - Engineering

Q1:

A hydraulic turbine has a discharge of 5 m3/s, when operating under a head of 20 m with a speed of 500 rpm. If it is to operate under a head of 15 m, for the same discharge, the rotational speed in rpm will approximately be

A 433

B 403

C 627

D 388

ANS:A - 433

N1 * H2^(1/2) = N2*H1^(1/2).
500*(15)^(1/2) = N2*(20)^(1/2),
[500*(15)^(1/2)]/[20^(1/2)] = N2.
N2 = 433.01.