- Rotary drilling
- Percussive drilling
- Rotary Percussive drilling
- None of the above
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) Which of the following drilling method is most common in coal mines
Solution:
In coal mines, the overlying strata or coal is hard so the drilling method is Rotary Percussive drilling as it provides more drilling power then only rotary or Percussive drilling
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