UPSC Civil Service Exam Questions - Engineering

Q1:

Two geometrically similar pumps are running at the same speed of 1000 r.p.m. and lifting water against the heads of 25 m and 16 m respectively. First pump is having an impeller diameter of 300 mm. The impeller diameter of second pump shall be

A 192 mm

B 240 mm

C 300 mm

D 469 mm

ANS:B - 240 mm

It is H1/H2 = (D1/DE)^2.