11. P-5 explosives are used for
12. Order the followings in decreasing stability of host rock:
1. Block caving
2. Cut & Fill
3. VCR stoping
4. Room & Pillar
1. Block caving
2. Cut & Fill
3. VCR stoping
4. Room & Pillar
13. Which of the following controls the magnitude and direction of the front abutment pressure for immediate roof in long wall working?
14. In a 3rd degree gassy mine the velocity of air measured at 7.5 m out bye of the discharge end of an air pipe should be
15. In depillaring operation major coal losses are from
16. Continuous miner and shuttle car combination is NOT applicable in mining with
17. The angle of draw in a trough subsidence helps in determining the
18. Which gas is synonymous with 'White damp'?
19. Panel barrier is punctured for
20. Every man-hole shall be kept clean & clear of obstruction, white-washed for a distance of not less than
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