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

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2162204 Mine Hazards Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2162204 Date:14/05/2019
Subject Name:Mine Hazards
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.


MARKS

Q.1 (a) Write the causes of fire damp explosion. 03
(b) Describe the precaution to be taken against coal dust explosion. 04
(c) Write the essential conditions to start fire. Describe the classification of fires.

07

Q.2 (a) Describe the limits of inflammability of firedamp. 03
(b) Write the difficulties and dangers faced during reopening of U/G mine. 04
(c) What do you mean by explosion? Explain the mechanism of explosion. 07
OR
(c) Describe the main functions of coward?s diagram 07
Q.3 (a) Explain the principle of stone dust barriers. 03
(b) What do you mean by spontaneous combustion? Write the main causes of
spontaneous combustion.
04
(c) Write the construction and applications of dust sampling apparatus. 07
OR
Q.3 (a) Name the types of stone dust barriers. Explain any one. 03
(b) Write a short note on detection and preventive measures of spontaneous
heating.
04
(c) Write a note on formation, prevention and suppression of dust in mines. 07
Q.4 (a) Which factors are considered during the selection of method for reopening of
area?
03
(b) Write a short note on methane layering. 04
(c) Describe the effects, causes and prevention of surface fires. 07
OR
Q.4 (a) Describe the layers of gases in mine atmosphere with their specific gravity. 03
(b) Explain the main functions of firefighting organization. 04
(c) Describe the effects, causes and prevention of underground fires. 07
Q.5 (a) Explain the firedamp with its chemical composition. 03
(b) Write a short note on detection of U/G fires. 04
(c) Write the different methods of reopening of U/G mines. 07
OR

Q.5 (a) Write the sources of formation of CO2. 03
(b) What do you mean by inflammability of coal dust? Write the factors affecting
inflammability of coal dust.
04
(c) Write a note on symptoms of spontaneous combustion and also describe the
classification of fires due to spontaneous combustion.
07

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