Home/Volume-2/Mine Gasses and Their Detection Volume-2 Mine Gasses and Their Detection Admin03/08/20240 80 Less than a minute Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 0% Mine Gasses and Their Detection Mine Gasses and Their Detection 1 / 38 1. The permissible limit of CO2 is? 0.50% 1.25% 0.75% 1% 2 / 38 2. Methane can be found at? roof floor Any place in the roadway Exhaust gases of the locomotive 3 / 38 3. Incomplete oxidation of coal results in? CO2 CO CH4 None 4 / 38 4. The permissible limit of the SO2 is? 10 ppm 50 ppm 7 ppm 5 ppm 5 / 38 5. Interferometers works on the principle of? Formation of gas cap Wheatstone bridge Infraradiation Optical properties 6 / 38 6. Each 1 % reduction in the O2 % results in about the depletion from the light is? 10% 20% 30% 40% 7 / 38 7. Flame safety lamp is extinguished at CO2 %? 2-Jan 3-Feb 4-Mar 5-Apr 8 / 38 8. When mixed with air H2S forms an explosive mixture, the limits of flammability is? 15-May 4.3 - 45 Dec-75 4.5 - 75 9 / 38 9. M.S.A methanometer is worked on the principle of? Formation of gas cap Wheatstone bridge Infraradiation Optical properties 10 / 38 10. CO2 is mostly found at? roof middle of the roadway dip areas of depillaring areas anywhere in the mine 11 / 38 11. The oxygen percentage in return air is? 20.28% 78.04% 20.93% 25% 12 / 38 12. The light is extinguished when black damp % is? 17% 17.50% 21% 20% 13 / 38 13. Hoolamite is a mixture of? Manganese dioxide + copper oxide Potassium superoxide + copper oxide silica gel + potassium palladium sulfate Iodine pentoxide + sulfuric acid 14 / 38 14. In M.S.A CO detector which tubes are used? P.S detector tubes Hopcalite Hoolamite None 15 / 38 15. Which can be found by blotting paper soaked in lead acetate changes its color to black? SO2 H2 H2S CH4 16 / 38 16. H2S is also called as? stink damp Marsh gas choke damp white damp 17 / 38 17. The minimum ppm of CO detected by CO detectors is? 3 5 10 50 18 / 38 18. For every 5% of black damp, the light is diminished by? 20% 30% 40% 50% 19 / 38 19. CO forms an explosive mixture with air when present within the range of nearly (by vol)? 15-May 4.5 - 45 Dec-75 4.5 - 75 20 / 38 20. Black damp is also called as? stink damp or stythe Marsh gas choke damp white damp 21 / 38 21. The light of oil lamps is extinguished when O2 % falls to? 19% 17.50% 21% 20% 22 / 38 22. CO is also called as? Black damp Marsh gas Stink damp White damp 23 / 38 23. The permissible limit for the nitrous fumes is? 10 ppm 50 ppm 7 ppm 5 ppm 24 / 38 24. Methane gas is also called as? stink damp Marsh gas choke damp white damp 25 / 38 25. Mining laws in India require that mine air should contain minimum % of O2 is? 25% 21% 19% 17% 26 / 38 26. The oxygen percentage in intake air is? 20.28% 78.04% 20.93% 25% 27 / 38 27. The permissible limit of the H2S is? 10 ppm 50 ppm 7 ppm 5 ppm 28 / 38 28. Hopcalite is used to detect? CO CO2 CH4 SO2 29 / 38 29. Decay of timber by fungus growth is caused by? CH4 O2 absorption N2 depletion CO2 30 / 38 30. The minimum voltage at which the methanometer works with accuracy is? 1 v 1.5 v 2.2 v 3 v 31 / 38 31. Black damp is a mixture of? CO2+N2 CO2+H2 CO2+O2 CO2+CO 32 / 38 32. When mixed with air H2 forms an explosive mixture, the limits of explosibility is? 15-May 4.3 - 45 Dec-75 Apr-75 33 / 38 33. The permissible limit of the CO is? 10 ppm 50 ppm 7 ppm 5 ppm 34 / 38 34. Ring rose detector works on the principle of? Formation of gas cap Wheatstone bridge Diffusion-combustion-contraction Optical properties 35 / 38 35. Spiralaram is worked on the principle of? Formation of gas cap Wheatstone bridge Infraradiation Optical properties 36 / 38 36. Which is formed in stagnant water in old workings in the areas of gob? CH4 SO2 H2S CO2 37 / 38 37. One kg of methane in burning evolves .....kcal of heat? 10000 12000 13600 15000 38 / 38 38. Hopcalite is a mixture of? Manganese dioxide + copper oxide Potassium superoxide + copper oxide silica gel + potassium palladium sulfate Iodine pentoxide + sulfuric acid Your score is The average score is 67% LinkedIn Facebook Twitter 0% Admin03/08/20240 80 Less than a minute
