Question

Which of the following correctly describes the working principle of a 'turbo' (or centrifugal surface-mounted) pump commonly used for lifting irrigation water from open wells/canals, distinguishing it from a submersible pump?

A It uses a piston to displace water mechanically
B It works only when fully submerged in water, like a submersible pump
C It uses solar energy exclusively with no mechanical parts
D It has no moving parts at all
E A surface-mounted centrifugal impeller pump requiring priming
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