When the water level in a well is at a depth of 7 m from the surface, the most suitable pump to lift water for irrigation is
Options:
(A) Submersible pump
(B) Horizontal centrifugal pump
(C) Axial flow pump
(D) Reciprocating pump
Official Answer Key:
B
Step-by-Step Solution & Explanation
A conventional (surface-mounted) horizontal centrifugal pump is limited by suction lift to a practical maximum of about 7–8 m under standard atmospheric conditions (theoretical limit ~10.3 m, but NPSH/friction/vapour-pressure losses reduce the practical value). At exactly 7 m, a horizontal centrifugal pump is still workable and is the conventional/economical choice for irrigation; a submersible (A) would be over-specified/costlier for this shallow depth, and axial-flow (C) suits high-discharge, very-low-head situations, not suction lift.
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