Two identical pumps in 'series' vs. 'parallel' connection:
Choose the correct answer
Series gives double flow; parallel gives double head
Series: heads add (2H); parallel: flows add (2Q) — choice depends on high-head vs. high-flow requirement
Both series and parallel give same result
Series reduces head and increases flow
Correct Answer
B. Series: heads add (2H); parallel: flows add (2Q) — choice depends on high-head vs. high-flow requirement
Why is this the answer?
Two identical pumps: (1) Series: heads ADD, flow same → total H = 2H_single at same Q; used for high head, moderate flow (borewell multistage pumps). (2) Parallel: flows ADD, head same → total Q = 2Q_single at same H; used for high flow, moderate head (water supply distribution). System operating point: intersection of combined pump curve with system H-Q curve. Parallel effective only if system curve is flat.
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