⛑️ Mining Safety MCQ Questions - Part 02
16. The permissible limit of CO in mine air is:
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Answer: A. 25 ppm
17. The primary gas causing explosions in underground coal mines is:
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Answer: B. Methane
18. The main function of auxiliary fans in mines is:
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Answer: B. Supply or exhaust air to inside headings
19. The main instrument used for methane detection in mines is:
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Answer: C. Methanometer
20. The minimum quantity of air required per miner in India is approximately:
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Answer: B. 3.5 m³/min
21. Mine rescue team members must undergo training at least:
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Answer: D. Every 6 months
22. Which gas is lighter than air and accumulates near roof?
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Answer: A. Methane
23. Flame in flame-safety lamp elongates in presence of:
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Answer: C. Firedamp
24. The standard duration of a self-contained self-rescuer (SCSR) is:
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Answer: B. 30 min
25. In Indian coal mines, percentage of incombustible content in stone dusting must be at least:
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Answer: D. 80%
26. Balanced ventilation means:
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Answer: A. Equal intake & return air
27. In mines, CO is dangerous because:
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Answer: D. Both B and C
28. The “Return airway” in a mine denotes:
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Answer: B. Passage carrying used/contaminated air out
29. Rescue stations are mandatory in coalfields beyond:
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Answer: C. 25 km radius
30. In case of mine accident, first step is to:
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Answer: A. Report immediately to mine manager
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