JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech III Year UNDERGROUND COAL MINING TECHNOLOGY Previous Question Paper (February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
List out the major coal production areas in India.
Answer
The major coal production areas in India include the Damodar Valley (Raniganj, Jharia, Bokaro), Son Valley (Singrauli, Umaria), Mahanadi Valley (Talcher, Ib Valley), Godavari Valley (Singareni), and Wardha Valley (Chandrapur).
Give classification of mining methods of coal.
Answer
Coal mining methods are broadly classified into two categories: 1) Underground Mining, which includes Board and Pillar, Longwall, and other specialized methods, and 2) Opencast (Surface) Mining, which includes manual, mechanized, and large-scale strip or quarry mining.
What is panel/district in Board and Pillar method mining?
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Explain the operations carried out in conventional mining in B&P method during development.
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What is stowing in Board and Pillar method mining?
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Explain briefly about systematic supports used in Board and Pillar method mining?
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What is long wall advancing method?
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What is salvaging in Long wall mining? Explain briefly.
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What is coal bed methane?
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Explain briefly hydraulic mining.
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PART - B
Explain the factors affecting choice of mining methods for coal by underground mining.
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Write short notes on:
Coal reserves in India
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Proximate analysis of coal.
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A coal seam of 3m thick, dipping at 1 in 9, is lying at a depth of 200 m from surface. It is planned to extract the coal seam by Bord and pillar method using L.H.D. Explain the sequence of operations during development with a suitable layout.
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Explain in detail various operations during development of a coal seam by room and pillar method, with suitable layout. Assume relevant data, wherever necessary.
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Explain the principles of depillaring operations in Board and Pillar mining with suitable figure (s) wherever necessary.
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Explain the problems associated with depillaring operations in Board and Pillar mining.
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Explain various operations to be carried out in underground for stowing operations with suitable figure(s).
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A coal seam of 3.2 m thick, dipping at 1 in 10, is lying at a depth of 300 m surface. It is planned to extract coal seam by long wall retreating method employing DERD shearer, AFC and powered supports. Explain the method with a suitable diagram. Assume relevant data, if necessary.
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Discuss on
Optimum length of Long wall face and size of Long wall panel.
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Organization and Long wall safety measures in Long wall mining.
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A coal seam 11m thick, dipping at 1 in 8, is lying at a depth of 220 m from surface. It is planned to extract such coal seam by basting gallery method. Explain the method in detail, with suitable figures (s).
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Explain the method of extraction of a coal seam by sub level caving method. Explain the method with suitable layout/figure(s).
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