Question Bank • QB_IDE_EXP_066 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Pump characteristics

Question Statement:

A centrifugal pump running at $1440\text{ rpm}$ discharges $40\text{ L/s}$ against a total head of $20\text{ m}$. If the pump speed is increased to $1800\text{ rpm}$, calculate the new discharge in $\text{L/s}$ using pump affinity laws ($Q \propto N$).

Answer Key:

50

Step-by-Step Solution & Explanation

$Q_2 = Q_1 \times \frac{N_2}{N_1} = 40 \times \frac{1800}{1440} = 40 \times 1.25 = 50.0\text{ L/s}$
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