JNTU
JNTU B.Tech III MINE ENVIRONMENTAL ENGINEERING II Previous Question Paper (November/December - 2018 - 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
State the formula of Grahams Index.
Answer
Graham's Index (GI) is defined as the ratio of the volume of carbon monoxide produced to the volume of oxygen absorbed, expressed as a percentage:
What are the different methods of ventilation control for control of fires?
Answer
Ventilation control methods for mine fires include:
- Sealing off the affected area using stoppings or fire seals to cut off oxygen supply.
- Pressure balancing (or pressure equalization) to minimize the pressure differential across seals.
- Controlled ventilation or reversal of airflow to isolate smoke and toxic gases from active working areas.
What are the special precautions to be taken by the rescue personnel while working in inert atmosphere?
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What are the factors affecting the choice of reopening methods?
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What is peak pressure ration?
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What are the explosive limits of coal dust?
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What are the causes of inundations from waterlogged workings?
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What are the factors governing the design of water dams?
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What are the different methods of artificial respiration?
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What is accumulation test?
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Part B
Explain the precautions to be taken against spontaneous heating of coal during development and depillaring.
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Describe the stages of spontaneous combustion of coal in mines.
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What are the experimental methods for the study of spontaneous combustion of coal?
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What is crossing point temperature of coal?
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What is direct blast and backlash?
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Discuss about balancing of pressures at stoppings.
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What are the advantages of fighting fires by inert gases?
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What are the different gases used for inertisation of fire areas?
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Explain the method of inertisation of fires in blasting gallery method using Nitrogen?
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Explain about fire fighting organization in Mines.
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Discuss the difference between the Coal Dust and Firedamp explosions in detail.
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Explain the surface measures against inundation.
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What are the different types of water dams based on their design?
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Explain about flat dams and also give the formula for determining the length of plug.
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Explain about the maintenance and examination of cap lamps.
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Give the standards of illumination in opencast mines.
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Discuss about Rescue organization at mines.
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