- 1 ampere
- 2 ampere
- 4 ampere
- 5 ampere
- 3 ampere
- None of these
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
For safety of mine electrical system earth pit resistance shall be kept limited to 1 Ampere.
Your go-to platform for competitive exams, job opportunities, and mining resources. Since 2019, we’ve been dedicated to providing quizzes, books, notes, and exam preparation materials to help you succeed in the mining industry.