Allied & ICAR Exam Bank • ALLIED_1214 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Centrifugal Pumps and Cavitation

Subtopic: Pump Affinity Laws

Question Statement:

A centrifugal pump delivers $30\text{ L/s}$ at an operating speed of 1450 rpm. If the pump impeller speed is increased to 1740 rpm (speed ratio $1740/1450 = 1.20$), using the affinity law ($Q \propto N$), the new discharge rate in L/s is:

Answer Key:

36

Step-by-Step Solution & Explanation

By affinity laws: $Q_2 = Q_1 \left(\frac{N_2}{N_1}\right) = 30 \times 1.20 = 36.0\text{ L/s}$.
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