🌬️ Mine Ventilation MCQ Questions - Part 03
31. A common method of ventilation survey in mines is:
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Answer: A. Pressure/quantity measurement
32. Tracer gas method is used to measure:
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Answer: B. Ventilation leakage
33. Methanometer is used to measure:
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Answer: B. Methane percentage
34. Flame safety lamp is primarily used for:
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Answer: D. Both B and C
35. Psychrometer is used to measure:
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Answer: B. Air humidity / wet bulb temperature
36. Gas chromatography in mines is generally used for:
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Answer: B. Analysis of sealed off areas
37. The “CO make” in sealed areas is an indicator of:
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Answer: B. Spontaneous heating
38. What is the statutory maximum percentage of CH4 allowed in working places?
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Answer: C. 1.25%
39. Which instrument measures gas concentration continuously?
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Answer: B. Electronic gas detector
40. Ventilation survey is generally recorded in:
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Answer: A. Form 6A book
41. A common location where methane layering occurs is:
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Answer: C. At roof of stagnant places
42. Gas detectors used for rescue work are generally:
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Answer: A. Multi-gas portable detectors
43. The primary gas to monitor during mine fires is:
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Answer: C. Carbon monoxide
44. Methane layering is dangerous because:
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Answer: B. Explosive when mixed with air in range 5–15%
45. Ventilation survey reports must be signed by:
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Answer: D. Manager or authorised engineer
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