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Assertion (A): A mean residence time from the tracer test that is smaller than the volume over the flow indicates dead volume.
Reason (R): Fluid that never enters the stagnant region passes through the remaining volume more quickly.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the diagnosis: part of the vessel is not participating, so the active volume is smaller than the geometric one and the fluid moves through it faster. The shortfall measures the inactive fraction.

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