Answer: B- An expanding tube at a constant rate.
A non-uniform steady flow is through an expanding tube at a constant rate.
In this flow, the stream changes from point to point in flow direction but does not change w.r.t. time. This flow condition is known as non-uniform steady flow. An example of nonuniform steady flow is water flow in a tapered pipe with the constant velocity at the inlet velocity will change along the length toward the exit.
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