⛑️ Mining Safety MCQ Questions - Part 04
46. Which gas is the primary cause of most mine explosions?
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Answer: B. Methane
47. What is the permissible limit of methane in return airways?
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Answer: C. 1.25%
48. Methane drainage in mines is usually done by:
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Answer: B. GOB wells / boreholes
49. A refuge chamber must be designed to provide life support for at least:
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Answer: C. 24 hours
50. In case of fire, the primary safe direction of escape is towards:
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Answer: B. Intake airway
51. Which gas is called “afterdamp”?
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Answer: B. CO + CO2 mixture after explosion
52. Emergency response plan in mines should include:
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Answer: D. All of the above
53. Which organisation in India approves mine rescue standards?
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Answer: A. DGMS
54. Main personal protection inside a refuge chamber is:
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Answer: A. Oxygen supply
55. In emergency planning, mock rehearsals should be conducted:
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Answer: C. Quarterly
56. Flameproof apparatus in mines is used to prevent:
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Answer: B. Sparks igniting methane
57. The standard distance between two main air shafts is about:
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Answer: C. 500 m
58. Emergency communication in mines is generally done by:
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Answer: D. All of the above
59. Risk assessment in mines mainly focuses on:
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Answer: D. All of the above
60. Refuge chamber capacity is generally designed per:
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Answer: C. 10 persons
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