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Halving the stack diameter at constant volumetric flow changes the exit velocity by a factor of

  • A.2
  • B.0.5
  • C.0.25
  • D.4

Answer: D

Velocity is flow divided by area and area goes as the square of diameter, so halving the diameter quadruples the velocity. The pressure drop rises steeply as well, which is what sets the practical limit on narrowing it.

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