Volume-2

Explosions in Mines

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Explosions in Mines

Explosions in Mines

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1. For coal dust explosion the quantity of coal is.....g/cu.m ?

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2. In longwall method the heavy type of stone dust barriers should be placed within the range of ...... m from the nearest point of the face?

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3. The water barriers must contain at least ...of water per sq.m of roadway cross section?

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4. The atmosphere becomes non-explosive irrespective of any % of firedamp if the minimum % of blackdamp is...?

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5. The distance between water barriers must not exceed ....m in gate roads and .....m in main roads?

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6. The maximum air velocity preventing escape of moisture from the coal dust at conveyor roads is?

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7. The delay eliminates completely if the H2 % in methane is?

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8. Explosive limit of the CH4 is?

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9. In light stone dust barriers the amount of stone dust is loaded is?

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10. The atmosphere is non-explosive if the O2 percentage is?

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11. Lower limit of inflammability of coal dust is?

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12. The quantity of moisture that would ensure non propagation of flame by coal dust at least.....of the total mixture?

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13. The higher limit of inflammability of coal dust is?

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14. In heavy stone dust barriers the amount of stone dust is loaded is?

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15. The amount of stone dust which must be added to the coal dust to make it non explosive is ?

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16. The stone dust barrier will fail if it located within minimum..... m from the face?

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17. The water barrier must be sited at least .....m away from the stone dust barrier?

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18. If the gas air mixture is compressed then the mixtures containing CH4 .....is inflammable?

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19. For every 1 % firedamp the additional stone dust is required for efficient stone dusting is?

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20. The lowest temperature at which a fine dry coal dust cloud can be ignited is ?

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21. Stone dust used for dusting should not contain.....free silica ?

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22. The maximum explosive violence is produced when the explosive mixture contains firedamp?

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23. The maximum air velocity preventing escape of moisture from the coal dust at working faces is?

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24. The time interval that elapses between application of a source of heat to firedamp air mixture and the actual moment of ignition of gas air mixture is?

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25. If the CH4 and air mixture is at 1000 deg C then the delay for ignition is?

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26. The % of incombustible dust in the coal dust sample in a mine should be ....... for the stone to be effective in preventing propagation of flame?

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27. In triggered barrier ...... is used ?

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28. In bord and pillar method of mining the stone dust barriers are placed .....m from the face?

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29. The coal is not likely to propagate flame for coal dust explosion if the coal containing of V.M ?

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30. The amount of heat is required to burn the methane is ?

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31. In longwall method the light type of stone dust barriers should be placed within the range of ...... m from the nearest point of the face?

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32. The size of the coal dust particles dangerous to cause greater inflammability is ?

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33. Ignition temperature of methane is?

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