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Which of the following is NOT a reason closed-circuit tunnels are preferred for serious work?

  • A.They give better flow quality
  • B.They are less affected by conditions in the building
  • C.They are cheaper to build
  • D.They need less drive power

Answer: C

Closed circuits cost considerably more, since they need a return duct, corner vanes and a larger building. Their advantages are entirely operational, which is why open-circuit tunnels still dominate teaching laboratories where capital cost governs.

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