In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?
(A) Discharge of water by a centrifugal pump being run at a constant rpm
(B) Water flow in the suction and discharge pipe of a reciprocating pump
(C) Water discharge from a vertical vessel in which constant level is maintained
(D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe
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