Question Bank • QB_IDE_EXP_067 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Pump characteristics

Question Statement:

For the same centrifugal pump in the previous question, calculate the new head developed in $\text{meters}$ at $1800\text{ rpm}$ ($H \propto N^2$).

Answer Key:

31.25

Step-by-Step Solution & Explanation

$H_2 = H_1 \times \left(\frac{N_2}{N_1}\right)^2 = 20 \times (1.25)^2 = 20 \times 1.5625 = 31.25\text{ m}$
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