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A well-mixed tank holds 100 litres and is fed pure water at 5 litres per minute, with the same flow leaving. What is its time constant?

  • A.5 minutes
  • B.500 minutes
  • C.0.05 minutes
  • D.20 minutes

Answer: D

The time constant is the volume divided by the volumetric flow, that is a hundred over five. It is also called the residence time and sets how quickly the tank responds to any change at its inlet. Three of them cover most of any transient.

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