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State whether the following is true or false.
The benefit of adding another tank to a cascade falls as the cascade gets longer.

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

Answer: A

Correct answer: True

The cascade converges on plug flow behaviour, so the gap left to close shrinks with every tank added and so does the benefit of the next one. In practice the first two or three splits capture most of what is available, and beyond about five or six tanks the extra vessels, pumps and control cost more than the conversion they buy.

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