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?

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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