JNTU
JNTU B.Tech III UNDERGROUND MINING TECHNOLOGY Previous Question Paper (January/February - 2023 - R16)
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
What are the advantages of horizon mining?
Answer
Horizon mining involves driving main haulage roads at fixed levels through rock, which provides several operational advantages. First, it allows for the use of high-capacity, efficient locomotive haulage systems due to the level and stable nature of the roadways. Second, it simplifies the ventilation and drainage infrastructure by establishing permanent, well-defined paths across the mine workings. Finally, it facilitates the concentration of production from multiple seams or mining areas to a single main haulage level, significantly improving overall mine productivity and logistics.
What are the precautions to be taken while development of a coal seam against the Roof control problems?
Answer
To manage roof control problems during the development of a coal seam, the following precautions are essential:
- Systematic Support: Implement a systematic support plan using props, roof bolts, or steel girders immediately after the exposure of the roof in development headings, strictly adhering to the approved Support Management Plan (SMP).
- Method of Working: Maintain narrow gallery widths and optimize the sequence of development to minimize the span of the exposed roof, thereby reducing the risk of roof falls.
- Monitoring and Inspection: Conduct regular inspections to identify early signs of roof instability, such as cracks, bed separation, or spalling, and utilize tell-tales or convergence indicators to monitor roof behavior in real-time.
What is the difference between Rise and Winze?
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What are the factors to be considered while selecting size of the shaft in metal Mining?
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What are the problems associated in BG method?
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Describe the strata control equipment used in a Longwall panel.
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List special method of working of thin deposits.
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Explain how you will fix chocks in shrinkage stope dipping at 65°.
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Give any four statutory provisions with regard to development of a coal mine.
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Explain dome theory and ring theory of rock pressure.
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Part B
What is the importance of development in panels?
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Explain different panel system of development along with the suitability, advantages and disadvantages with simple sketches.
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Explain the five heading development system along with the available working faces, Machinery deployment, manpower requirement, production and productivity with a simple sketch.
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What are the conditions suitable for development of coal seam with SDL?
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What is Level Interval?
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What are the advantages of short level intervals?
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Differentiate coal mining vs metal mining.
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What are the draw backs of raising with two compartment methods?
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Explain Raising by long hole drilling.
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What are the conditions suitable for mechanical loaders like LHDs, SDLs and shuttle cars?
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Explain the factors affecting the design of size of a bord and pillar panel.
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Differentiate the methods of Longwall advancing and retreating in detail.
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Explain about the features of Longwall Powered Roof Supports.
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Explain production and blasting operations in sublevel caving.
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What are the applicable conditions of block caving?
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Explain the stoping method which is suitable for moderately strong ore and Roof.
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Calculate the percentage of extraction of coal during development, splitting and depillaring? Assume the slice and rib dimensions. Draw the sketch showing depillaring method with dimensions given below: Pillar size: 35 m Centre to Centre; Original gallery dimensions: 4.2m × 2.5m; Split gallery dimensions: 4.8m × 2.5m; No. of pillars in the panel: 16 nos.
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Explain the stoping method which is suitable for moderately strong ore and roof.
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