Volume-1

Stowing Practice

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Stowing Practice

Stowing Practice

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1. The angle of draw in Indian coal fields?

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2. Hydraulic stowing is not successful where the seam is less than ...m depth and flatter than ...deg?

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3. The line of extraction best suited for hydraulic sand stowing is?

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4. The stowing efficiency in pneumatic sand stowing?

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5. The sand input to the bunker is calculated by?

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6. In sand stowing high local velocity of sand results in..?

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7. In hydraulic sand stowing the operations are conducted such that not more than .....sq.m of roof area is exposed in any working area at a time and not more than .... such places are left unstowed?

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8. The stowing efficiency in Mechanical sand stowing?

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9. The stowing rate in Mechanical sand stowing?

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10. The stowing rate in hydraulic sand stowing is?

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11. In hydraulic sand stowing the throw of the sand without nozzle is ...m and with nozzle is ...m?

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12. The upper portion of the sand stowing pipe is generally changed after the transport of ....lac ton of sand?

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13. In hydraulic sand stowing the H/L ratio for a reasonably good stowing rate?

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14. With hydraulic sand stowing of the goaf the subsidence can be reduced to about ....of the amount caused by caving?

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15. There was no movement at the surface until the face advances up to....m?

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16. The stowing efficiency in hand packing is?

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17. The required water for 1 te of sand in hydraulic sand stowing?

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18. In hydraulic sand stowing the pipe end should be away from the dip of the boxing is?

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19. The angle of inclination from vertical of the line connecting the edge of the workings and the edge of the subsidence area is called?

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20. The face must advance by approximately a distance of ....times the depth of the seam for the full subsidence to take place?

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21. The min velocity of the slurry in the pipe should be.....?

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22. In sand stowing generally the sand required for one te coal extraction in a virgin area?

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23. The stowing efficiency in hydraulic sand stowing?

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24. To stop the stowing which is done to avoid the jamming of the pipe?

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25. The size of the largest particle of the sand does not exceed if the dia of the pipe is D is?

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26. For deeper mine the sand:water ratio in sand stowing is?

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27. The discharge velocity of the sand in pneumatic sand stowing?

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28. In sand stowing incorrect profile will affect..?

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29. Which portion of the pipe is damaged more in sand stowing?

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30. If the full subsidence occurs at more than one point then the subsidence is called?

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31. The life of the M.S pipe used in sand stowing is......lac ton of sand?

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