JNTU
JNTU B.Tech III UNDERGROUND COAL MINING TECHNOLOGY Previous Question Paper (November/December - 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 is the application of Horizon Mining?
Answer
Horizon mining is primarily applied in coal seams with significant dip or in mountainous terrain where the coal seam outcrops at different elevations. It involves driving main haulage levels horizontally through the strata to intersect multiple seams, allowing for efficient gravity-assisted transport and centralized haulage systems.
Give a comparison of different modes of entries to a mineral deposit.
Answer
| Entry Type | Application |
|---|---|
| Adit | Used for seams outcropping on hillsides; provides natural drainage and easy access. |
| Incline | Used for shallow deposits; allows for conveyor or rope haulage directly from the face. |
| Shaft | Used for deep-seated deposits; provides vertical access for hoisting, ventilation, and pumping. |
Write the application of Bord and Pillar method of mining.
Answer
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What are the factors to be considered for selection of size of the panel?
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What are the preparatory arrangements to be made before the commencement of depillaring operations in Bord and Pillar mining?
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List the various machinery used for coal lifting and hauling in Bord and Pillar method of mining? Give the application of each of them.
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Give the classification of longwall mining.
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Write the applicability of longwall advancing and retreating methods.
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Write the application of Road headers in mechanized mining.
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What are the advantages and disadvantages of hydraulic mining?
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Unit I
Give a note on the conditions to be considered for selecting of shaft site.
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Explain the importance of location from economic and efficiency of ventilation shaft point of view.
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Explain ‘Shaft Pillar’. Give a brief on the various thumb rules developed for determining the size of the shaft pillar.
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Unit II
Explain Regulation 99 of ‘The Coal Mines Regulations, 1957’.
Answer
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Give the different types of panel along with application of each one in Bord and Pillar method of coal mining.
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What are the factors to be considered for determining the size of the panel?
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Unit III
Explain the Blasting Gallery method of mining along with its applicability, advantages and disadvantages.
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Explain the method of pillar extraction with hydraulic stowing along with the layouts of pillar extraction and stowing arrangement.
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Unit IV
Explain the system of supporting in longwall face and gate roads along with the significance of front abatement pressure and supporting with regard to it.
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What are the various methods of longwall cutting?
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Illustrate the uni-directional sequence of cutting with the help of diagrams.
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Unit V
Design a longwall panel for production of 0.6 Million Tonnes per annum. Assume your own conditions.
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What are the factors for successful operation of ploughs?
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What are the advantages and disadvantages of plough over shearers?
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