1. Props are withdrawn by
2. The depression of ground surface and structures are called
3. Instrumentation helps in understanding the behaviour of roof by measuring . . . . . . . .
4. The external pump, serving number of props from one central site, connected to prop by pipes called
5. In cog, sleeper piece should be in the shape of
6. In pressure arch theory, the bending forces whose magnitude increases with . . . . . . . . excavation.
7. In 3 m of immediate roof of an coal in u/g, bottom 2 m layer of sand stone of fine grained layer, has an RMR of 45, while upper 1 m of coarse grained sand stone has RMR of 30. What will be the over all RMR of the immediate roof?
8. Hydraulic prop is an . . . . . . . . support, where as shot creting is a . . . . . . . . support.
9. The phenomina of lift in up of floor, if the floor is week called
10. A prop which is set that the axis is inbetween the vertical and the normal to the seam called
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