Explosives, Accessories and Blasting Practice – 1

1. In ANFO explosive the % of diesel oil is mixed for effective oxygen balanced explosive mixture is?

2. The VOD of Emulsion explosive is?

3. The length of shot firing cable in OCP should not be less than..?

4. The VOD of OCG is?

5. Magazine should be away from all buildings at least.........m?

6. What excess % of diesel oil will lower the sensitivity?

7. With permitted explosive the duration of flame is?

8. The hole should terminate ....m below if immediate roof is shale?

9. A chemical component having 3 properties-High explosive and Oxidising agent and cooling agent is?

10. In ANFO the water content should not be more than?

11. An instrument to test the continuity of an electric circuit for firing system is?

12. Detonating fuse consists core of..?

13. The tool that is used for cleaning and detection of crack in a shot hole is?

14. The VOD of premix is?

15. The detonator used in electrical storms where static electricity is there?

16. At least how much % the packed explosives are less effective than bulk explosives?

17. Safety fuse consists core of..?

18. The constituents in slurry explosive (TNT:AN)?

19. The VOD of ANFO is?

20. The gelling agent in slurry explosive is..?

21. The pattern of cut mostly preferred in tunnels and drifts of small area is?

22. Sheathed explosive coated with a sheath of?

23. The depth of hole is restricted to 50%-60% of the width of the drift in..?

24. The sensitizer in Emulsion explosive is?

25. The amount of diesel oil mixed for 100kg of AN is (dry season and wet season)?

26. The VOD of Nonel is.......?

27. In the detonator the priming charge is?

28. The VOD of slurry explosive is?

29. The burning speed of the safety fuse is?

30. The reducing agent in slurry explosive is?

31. The VOD of Detonating fuse is...?