JNTU
JNTU B.Tech III UNDERGROUND COAL MINING TECHNOLOGY Previous Question Paper (November/December - 2017 - R13)
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.
Part A
Answer all questions.
What are the disadvantages of large mines?
Answer
Large mines face disadvantages such as increased complexity in ventilation and transport management, higher capital investment, greater difficulty in maintaining effective supervision, and increased risk of large-scale accidents or fires.
What factors influence the size of the protection pillar?
Answer
The size of a protection pillar is influenced by the depth of the seam, the nature of the immediate and main roof strata, the thickness of the coal seam, the compressive strength of the coal, and the presence of any geological disturbances or water-bearing strata.
What is the rate of increase of strata pressure with respect to depth?
Answer
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What is the use of nomographs?
Answer
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What are the limitations of Blasting Gallery Method?
Answer
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What are the DGMS statutory provisions on splitting of pillars?
Answer
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What is Salvaging?
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What are the commonly used means of transport of materials in LW?
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What are the limitations of coal plough?
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What is the difference between chock and chock shield supports?
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Unit I
List and explain the factors which affect the number, size and type of mine openings.
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Discuss about the reserves, life and size of the mines with respect to mine planning.
Answer
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Unit II
Describe the General principle of Bord and Pillar Development with a sketch.
Answer
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What are the disadvantages of Bord and Pillar method?
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What are the different ways of drivage of galleries in Bord and Pillar development?
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Explain Cut and load mechanically by Continuous Miners with a layout.
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Unit III
Explain extraction of pillars in seams prone to bumps.
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Explain extraction of pillars in thick and steep seams with caving.
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Unit IV
Explain the Longwall layout with powered support face with caving. Face length 150 m. Thickness: 3.3 m. Assume the machinery and other conditions to get an annual production of 7 Lakh tonnes per year. What is the expected productivity?
Answer
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Write about Strata monitoring Plan in Longwall.
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Write short notes on (i) Stress Capsule (ii) Multi point borehole extensometer.
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Unit V
What are the variants of Room and Pillar mining?
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Explain different support systems adopted in drivage of gate roads for LW retreating panel.
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Explain a Hydraulic prop along with its safety features.
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