- Crushing
- Chipping
- Both (a) and (b)
- Either (a) or (b)
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) In percussive drilling, the rock is broken by the following action
Solution:
In percussive drilling, due to the constant percussive action the rock gets crushed and also results in chipping.
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