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Consider the following statements about the plug flow assumption.
1. There is no mixing in the direction of flow.
2. Composition is uniform across any cross-section.
3. There is complete mixing in the direction of flow.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

The first two are correct and together define plug flow as an idealisation. The third describes a stirred tank and is the direct opposite of the first statement, so no reactor can satisfy both at once and the two models sit at opposite ends of the range.

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