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State whether the following is true or false.
An ideal plug flow reactor has a residence time distribution that is a spike.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: C

Correct answer: True

In ideal plug flow every element takes exactly the same time to traverse the reactor, so all the tracer emerges at \( t = \tau \) and nowhere else - a Dirac spike. A perfectly mixed tank gives the opposite extreme, a decaying exponential beginning at \( t=0 \), and every real reactor lies somewhere between the two.

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