Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III MINE ENVIRONMENTAL ENGINEERING – II Previous Question Paper (January/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
Define Spontaneous combustion.
Answer
Spontaneous combustion is the process of self-heating of coal due to the slow oxidation of coal at ambient temperatures, which, if not dissipated, leads to a rise in temperature until the ignition point is reached, resulting in a fire without an external heat source.
What are the different sources of Mine fires?
Answer
The primary sources of mine fires include:
- Spontaneous heating of coal.
- Friction from mechanical equipment, conveyor belts, or rubbing of cables.
- Electrical faults such as short circuits or overheating of cables.
- Use of open flames, welding, or cutting operations underground.
- External sources like surface bush fires or lightning strikes entering the mine.
Mention different firefighting equipments used in mine fires.
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Mention different preventive measures used in firedamp explosions?
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What is meant by stone dust barrier?
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What are the occupational hazards due to mine dust?
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What are the causes of Mine Inundation?
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What are the impacts caused by blast induced vibration and noise?
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What are the salient features of rescue stations?
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Why Mine illumination is significant factor in the operation of mining?
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Part B
Discuss in detail the coal oxygen complex theory.
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Describe the intrinsic factors that affects spontaneous combustion of coal.
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Explain the Graham’s ratio and its significance.
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Discuss various methods used in reopening of sealed areas in mines.
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Frictional sparking
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Electrostatic sparking in mine explosion.
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Discuss in detail the design of stone barrier and water barrier in Mine explosion.
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Control over ignition sources
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Control over flammable material.
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Explain in detail the design of the coal mine drainage system with a schematic diagram.
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What are the effects of noise pollution during mining activities?
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What are the factors resulting in to an air –blast and noise?
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The impact of noise is dependent on what factors in noise pollution?
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What are the illumination standards followed in open cast mines?
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Describe the lamp room design and significance in mining.
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Explain in detail the rescue station, its operations and equipment used.
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