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An ideal stirred tank has an E curve that is

  • A.a spike at the mean residence time
  • B.a symmetrical bell shaped curve
  • C.flat between zero and twice the mean
  • D.an exponential decay from time zero

Answer: D

Some tracer leaves immediately and some stays a very long time, which is exactly what perfect mixing implies. The exponential form is the widest spread any single well mixed vessel can give. Some tracer leaves almost at once.

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