Home/Volume-1/Thickseam Working Volume-1 Thickseam Working Admin02/08/20240 79 Less than a minute Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 0% Thick Seam Working Thickseam Working 1 / 37 1. In sublevel caving method extraction is always done by ? drilling and blasting coal cutting machine continuous miner shearing 2 / 37 2. The Wongawalli method is? a caving method a stowing method top slicing method sublevel method 3 / 37 3. The method of working which resembles step diagonal method of bord and pillar ? sublevel caving longwall thick seam mining room and pillar 4 / 37 4. In multi slice method extraction of the top section is called? under winning over winning in winning out winning 5 / 37 5. While working thick seams the method of working does not leave any coal bands in the goaf? caving stowing both of the above none of the above 6 / 37 6. While working thick seams the slicing method which works in horizontal slices between floor and roof is called ? under winning over winning in winning out winning 7 / 37 7. The remaining pillars after extraction in Wongawalli method is extracted as in? retreating longwall advancing longwall bord and pillar top slicing 8 / 37 8. The extraction of roof coal at different intervals is called ? caving slicing slicing and caving both a & b 9 / 37 9. In multi slice method extraction of the bottom section is called? under winning over winning in winning out winning 10 / 37 10. The general line of extraction adopted in Wongawalli method is ? Diagonal Step diagonal Parallel to the strike Arrow head method 11 / 37 11. While working thick seams the slicing method which works in horizontal slices between floor and roof is called ? under winning over winning in winning out winning 12 / 37 12. The angle of inclination of slicing face to the vertical while working thick seams is always ? 40 degrees 45 degrees 50 degrees 60 degrees 13 / 37 13. In Wongawalli method of working the coal bands remaining in the goaf after extraction may lead to? Air blast Rock burst Bumps Spontaneous heating 14 / 37 14. The method which uses combination of caving and slicing is? slicing caving longwall sublevel caving 15 / 37 15. In multi slices method of extraction the thickness of each slice should not exceed ? 1.0m 1.5m 2.0m 3.0m 16 / 37 16. In Wongawalli method of working when air borne dust is more the application of water infusion is done at a pressure of ? 10-12 litres/m2/hr 20-22 litres/m2/hr 30-32 litres/m2/hr 40-42 litres/m2/hr 17 / 37 17. Multi slice method of extraction is adopted where? the thickness of the seam is more gradient of the seam is more occurrence of gas occurrence of faults 18 / 37 18. In CM working the miners engaged in coal extraction work as a team known as ? team band crew group 19 / 37 19. In working thick seams by inclined slicing method the angle of inclination of slicing face to the horizontal is always between ? 20-25 degrees 25-30 degrees 30-40 degrees 40-50 degrees 20 / 37 20. The method of working does not allow any interlaced pillars of solid coal within the depillared area except the fender or snook of coal left on the sides of the gate roads ? Arrow head method Step diagonal Wongawalli method Bord and pillar 21 / 37 21. While working thick seams the slicing method which works in horizontal slices between floor and roof is called ? under winning over winning in winning out winning 22 / 37 22. The extraction of roof coal at different intervals is called ? caving slicing slicing and caving both a & b 23 / 37 23. The depth of development galleries are? 5m 6m 7m 8m 24 / 37 24. In inclined slicing method the percentage of extraction is ? 60-70% 70-80% 80-90% 90-100% 25 / 37 25. The method which allows to recover more percentage of coal deposit is? caving stowing longwall both of the above 26 / 37 26. The grade of roof required for Wongawalli method? strong moderate weak very weak 27 / 37 27. The blocks of solid coal with pillars are formed are called? sections panels barriers squares 28 / 37 28. While working thick seams the slicing method which works from the roof of the seam towards the floor is called ? under winning over winning in winning out winning 29 / 37 29. While working thick seams the slicing method which works from the bottom of the seam towards the roof is called ? under winning over winning in winning out winning 30 / 37 30. In multi slice method of extraction the pillars of the lower section is always ? larger than the upper section equal to the upper section smaller than the upper section none of the above 31 / 37 31. In sublevel caving method the unit of operation is always carried out in? development of roadways room and pillar advance galleries sublevel drifts 32 / 37 32. In multi slice longwall method of working the first slice normally extracted is ? top slice middle slice bottom slice none of the above 33 / 37 33. In thick seam mining using caving method the percentage of extraction is about ? 30% 50% 70% 90% 34 / 37 34. The normal productivity of C.M. workings is about ? 300-400 tonnes 400-500 tonnes 500-600 tonnes 600-700 tonnes 35 / 37 35. The cross section of each slice in inclined slicing method is normally ? 1-1.5m 1.5-2m 2-2.5m 2.5-3m 36 / 37 36. In multi slice longwall the face length of each slice should not be less than ? 30m 40m 50m 60m 37 / 37 37. The Wongawalli method is developed by? TISCO BCCL SCCL GSI Your score is The average score is 39% LinkedIn Facebook Twitter 0% Admin02/08/20240 79 Less than a minute
