Ventilation Math II
Practice test questions for the PA Mine Officials' Exam

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Question 1 of 16

1.  What is the rubbing surface in a circular airway that is 4 feet in diameter and 5000 feet long?

  1. 15,700 square feet
  2. 31,400 square feet
  3. 47,100 square feet
  4. 62,800 square feet

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