21. The systamatic timbering rules framed by the
22. The build up pump provided in hydrualic prop is comes under
23. The thickness of flat base piece not less than . . . . . . . . used for setting props
24. If the two bodies are held in contact and one moves with respect to the other, the force P for just moving the body is
25. Compressive strength of curved resin
26. The support employed in semi parmanent and parmanent road ways.
27. In terms of resourcefulness [Reserveper km2] which of the Indian coal fields in on top position.
28. As for roof support DAST stands for
29. The stored energy in the material called
30. The roof which will give warning before fracture.
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