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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER 6(NEW) • EXAMINATION SUMMER 2018
Subject Code: 3362203 Date: 03-May-2018
Subject Name: Under Ground Mining Of Coal
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.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1
Answer any seven out of ten.
14
1.
Explain roof in terms of board and pillar mining.


2.
Explain headings in terms of board and pillar mining.


3.
Explain junction in terms of board and pillar mining.


4.
Explain face in terms of underground mines.


5.
What is local fall?


6.
What is subsidence?


7.
What is tributary area?


8.
Name machinery which are used for drilling in underground mines?


9.
Name machinery which are used for transportation in underground mines?


10.
Name machineries which are used for coal cutting in underground mines?


Q.2

Write classifications of underground coal mining method.
03


.

OR

Write Jharkhand coal mining condition.
03




Explain rank of coal.
03



OR

Write a note on Orissa coal mining condition.
03
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Write a note on hydraulic mining method.
04

.

OR

What are the conditions suited for the application of horizon mining?
04




What are the applicability conditions of board and pillar mining?
04



OR

Write a note on ventilation of mine working.
04



Q.3

What are the advantages of board and pillar mining?
03
3



OR

What are the factors governing Size of pillars?
03




What are the disadvantages of board and pillar mining?
03



OR

Explain the manual method of driving galleries.
03




Draw a diagram and explain driving galleries with the continuous miner.
04



OR

What are the benefits of working with the panel?
04




What are the preparatory arrangements before depillaring?
04



OR

What are the factors affecting the size of the panel?
04



Q.4

Explain diagonal line of extraction.
03




OR

What are the advantages of stowing?
03




How ventilation of Longwall faces is being done?
04



OR

Write applicability conditions for depillaring by caving.
04




Explain stowing arrangements with the neat figure.
07



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Q.5

Draw shearer and explain its working.
04





Write a note on prop support in longwall method
04




Write advantages of Longwall Advancing Method.
03




What is H:L ratio in stowing? Explain.
03

H:L