Tunnel Engineering

The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than_____.

  • A. 200 particles/cm3
  • B. 250 particles/cm3
  • C. 300 particles/cm3
  • D. 450 particles/cm3
Answer: Option D.
Explanation: 

No answer description available for this question.

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