Longwall Mining MCQ Questions - Part 04 | Indian Minerology

Longwall Mining MCQ Questions - Part 04

46. The immediate roof in Longwall mining means:

• A. First few meters of rock above coal seam
• B. Overburden thick strata
• C. Floor rock
• D. None

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Answer: A. First few meters of rock above coal seam

47. Subsidence in Longwall mining occurs mainly due to:

• A. Caving of roof in goaf
• B. Pillar removal
• C. Blasting vibrations
• D. None

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Answer: A. Caving of roof in goaf

48. The main role of chocks in powered supports is:

• A. To resist vertical load
• B. To guide conveyor
• C. To transport coal
• D. To cut coal

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Answer: A. To resist vertical load

49. Tail gate in Longwall is used primarily for:

• A. Air return
• B. Coal haulage
• C. Power supply
• D. Escape way

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Answer: A & D (Air return and Escape way)

50. Longwall method is uneconomical in:

• A. Thick, uniform seams
• B. Shallow seams with irregular geology
• C. Deep uniform seams
• D. Flat seams

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Answer: B. Shallow seams with irregular geology

51. Main requirement of LTCC method is:

• A. Thick seam
• B. Thin seam
• C. Very irregular seam
• D. Igneous intrusion

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Answer: A. Thick seam

52. Major maintenance requirement in Longwall mining is for:

• A. Shearer
• B. Hydraulic supports
• C. Conveyor system
• D. All of the above

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Answer: D. All of the above

53. A common environmental effect of Longwall mining is:

• A. Subsidence
• B. Air pollution
• C. Deforestation
• D. Acid mine drainage

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Answer: A. Subsidence

54. The Gate roads in Longwall are generally supported by:

• A. Roof bolts
• B. Powered supports
• C. Timber props
• D. Steel arches

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Answer: A. Roof bolts

55. Strata control in Longwall is most effective by:

• A. Chock supports
• B. Standing props
• C. Leaving coal pillars
• D. None

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Answer: A. Chock supports

56. The main reason of adopting mechanization in Longwall mining is:

• A. Productivity and safety improvement
• B. Worker shortage
• C. High cost
• D. Reserved policy

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Answer: A. Productivity and safety improvement

57. The hydraulic legs of powered supports work mainly on:

• A. Compressed air
• B. Water-oil emulsion
• C. Pure water
• D. Sand filling

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Answer: B. Water-oil emulsion

58. Retreat Longwall is generally preferred over advancing in:

• A. Deep seams with bad roof
• B. Flat, strong roof seams
• C. Steep seams
• D. None

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Answer: A. Deep seams with bad roof

59. Longwall automation focuses mainly on:

• A. Shearer guidance
• B. Face alignment
• C. Remote control operation
• D. All of the above

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Answer: D. All of the above

60. Which mining method ensures maximum recovery of coal reserves?

• A. Bord and pillar
• B. Longwall
• C. Room and pillar
• D. Shortwall

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Answer: B. Longwall

📚 Longwall Mining MCQ Series

"This series of questions has been designed to develop a deeper understanding of Longwall Mining and to aid in effective examination preparation.” ✅

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