The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec?
Correct answer: B
Explanation
Peripheral velocity (U) is calculated as $\pi D N / 60$. Using $D=25$ cm ($0.25$ m) and $N=950$ rpm: $U = \pi \times 0.25 \times 950 / 60 \approx 12.4$ m/s.