Question Bank • QB_IDE_EXP_055 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Pump selection and installation

Question Statement:

When the same two identical pumps are connected in parallel, at the head of $20.0\text{ m}$, the total combined discharge in $\text{m}^3\text{/s}$ is ________ (answer in exact decimal).

Answer Key:

0.05

Step-by-Step Solution & Explanation

When two identical pumps operate in parallel: • The head developed across each pump remains the same: $H_{parallel} = H_1 = H_2 = 20.0\text{ m}$. • The discharges of the pumps add up: $Q_{parallel} = Q_1 + Q_2 = 0.025 + 0.025 = 0.050\text{ m}^3\text{/s}$.
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