Allied & ICAR Exam Bank • ALLIED_0562 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Centrifugal Pumps and Cavitation

Subtopic: Centrifugal Pumps and Cavitation

Question Statement:

A centrifugal pump operating at speed $N_1 = 1450\text{ rpm}$ delivers discharge $Q_1 = 20\text{ L/s}$. According to pump affinity laws ($Q \propto N$), if speed increases to $N_2 = 2900\text{ rpm}$ (doubled), the new discharge $Q_2 = Q_1 (N_2 / N_1)$ in L/s is:

Answer Key:

40

Step-by-Step Solution & Explanation

$Q_2 = 20 \times (2900 / 1450) = 20 \times 2 = 40.0\text{ L/s}$.
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