JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech III MINE ENVIRONMENTAL ENGINEERING - II Previous Question Paper (May/June - 2019 - R16)
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
How the coal is determined to be susceptible to spontaneous heating.
Answer
Coal susceptibility to spontaneous heating is determined using the Crossing Point Temperature (CPT) test or the Oxygen Adsorption Rate. A lower CPT indicates higher susceptibility, as it represents the temperature at which the rate of oxidation exceeds the rate of heat dissipation.
Draw a neat sketch of Soda Acid Extinguisher.
Answer
A Soda Acid Extinguisher consists of a cylindrical metal body containing a sodium bicarbonate solution and an inner glass bottle containing sulfuric acid. When the plunger is struck, the bottle breaks, causing a chemical reaction that generates carbon dioxide gas, which pressurizes the unit and expels the liquid through a nozzle.
State the advancements in fire-fighting techniques.
Answer
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State the preventive measures to avoid firedamp explosion.
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State the method employed to detect methane in coal mines.
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How is mine dust produced?
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State the sources of noise in mines.
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What do you understand by term vibration and how it is harmful?
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What are the limitations of self-contained breathing apparatus?
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Write briefly about self-rescuer.
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Part B
State various theories of spontaneous combustion in context with coal mines.
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Explain any two methods of fire extinguishing in detail with its advantages and limitations.
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What are the rescue operations carried out in fire zones? Explain.
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Describe the factors to be considered while reopening sealed-off areas.
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What are the common factors leading to mine explosion? Explain.
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Write a short note on the prescribed procedure to reopen the sealed-off areas.
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What are the preventive measures to avoid coal mine hazards.
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Why is coal dust hazardous? Give an account of Indian Mines.
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Describe in detail the assessment procedure of mine dust.
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State various hazards associated with coal mines.
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State the precautions to prevent noise in mines.
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State the environmental aspects of blast induced vibration and noise.
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Write in brief about occupational diseases related to mine working environment stating its symptoms and measures to prevent the same.
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What are the common types of flame safety lamps? State their limitations.
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Write a brief note on rescue stations.
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State the principles of risk management in mines.
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