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All of the following are unsteady state situations EXCEPT

  • A.a batch reactor that is part way through its run
  • B.a plant during its start-up
  • C.a column running at its design conditions
  • D.a tank that is being filled

Answer: C

The column at design conditions has settled and nothing changes with time. The other three all have a non-zero accumulation term and require a differential treatment. Design conditions are by definition a steady state.

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