JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year UNDERGROUND COAL MINING TECHNOLOGY Previous Question Paper (May - 2018 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What are the advantages of adits?
Answer
Adits provide the advantage of gravity drainage of mine water and natural ventilation, which significantly reduces pumping and ventilation costs. Additionally, they allow for direct access to the seam from the surface, simplifying the transport of men and materials.
What is the influence of depth on size of the mine?
Answer
As depth increases, the vertical stress on the coal seam rises, necessitating larger pillar sizes to maintain structural stability. Consequently, to prevent strata control issues like pillar crushing or floor heave, the percentage of extraction must be reduced, which limits the overall size and productivity of the mine layout.
Give the formula for Strength of pillar by Salamon and Munro.
Answer
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What is the classification of Bord and Pillar Mining System?
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What is the permitted area of exposure with stowing?
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What are the statutory provisions for working of contiguous seams?
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What are the different directions of Longwall face advance?
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List the factors which influence the layout of a longwall face.
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What are the conditions suitable for use of coal plough?
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What is the difference between a Hydraulic prop and the Friction prop?
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Part B
Explain the influence of reserves and production capacity on mine planning.
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What is the difference between in-seam mining and horizon mining?
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What are the advantages and disadvantages of division into levels and districts?
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Describe the statutory provisions of Bord and Pillar development.
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What are the advantages of panel system of working?
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What are the different mining processes and systems in Bord and Pillar method?
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Explain one development method which produces 450 T per day production. Assume your own conditions.
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Explain the principle and designing of pillar extraction.
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What are the factors influencing the choice of pillar extraction techniques?
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Explain the problems in the extraction of pillars.
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What are the different cutting patterns with a Shearer in Longwall?
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Explain the bi-directional method of cutting with a sketch.
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What do you mean by Strata monitoring in Longwall?
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List and Explain commonly used strata monitoring instruments in Longwall.
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What are the different types of Powered Roof Supports?
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Explain Chock Shield Powered Roof Support with a sketch.
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What are the safety features of a Chock Shield?
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What are the different types of thick seam mining methods?
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Explain Blasting Gallery method by illustrating different cycles of operations.
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