Download GTU BE/B.Tech 2019 Summer 6th Sem New 2162204 Mine Hazards Question Paper

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Subject Code: 2162204

GUJARAT TECHNOLOGICAL UNIVERSITY

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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019

Subject Name: Mine Hazards

Time: 10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Write the causes of fire damp explosion. [03]
2. Describe the precaution to be taken against coal dust explosion. [04]

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3. Write the essential conditions to start fire. Describe the classification of fires. [07]

Q.2

1. Describe the limits of inflammability of firedamp. [03]
2. Write the difficulties and dangers faced during reopening of U/G mine. [04]
3. What do you mean by explosion? Explain the mechanism of explosion. [07]

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OR

1. Describe the main functions of coward’s diagram [07]

Q.3

1. Explain the principle of stone dust barriers. [03]
2. What do you mean by spontaneous combustion? Write the main causes of spontaneous combustion. [04]

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3. Write the construction and applications of dust sampling apparatus. [07]

OR

1. Name the types of stone dust barriers. Explain any one. [03]
2. Write a short note on detection and preventive measures of spontaneous heating. [04]
3. Write a note on formation, prevention and suppression of dust in mines. [07]

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Q.4

1. Which factors are considered during the selection of method for reopening of area? [03]
2. Write a short note on methane layering. [04]
3. Describe the effects, causes and prevention of surface fires. [07]

OR

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1. Describe the layers of gases in mine atmosphere with their specific gravity. [03]
2. Explain the main functions of firefighting organization. [04]
3. Describe the effects, causes and prevention of underground fires. [07]

Q.5

1. Explain the firedamp with its chemical composition. [03]

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2. Write a short note on detection of U/G fires. [04]
3. Write the different methods of reopening of U/G mines. [07]

OR

1. Write the sources of formation of CO₂. [03]
2. What do you mean by inflammability of coal dust? Write the factors affecting inflammability of coal dust. [04]

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3. Write a note on symptoms of spontaneous combustion and also describe the classification of fires due to spontaneous combustion. [07]

Date: 14/05/2019

Total Marks: 70

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