11. The reaction of offered by the prop to the strata called
12. The change in induced stress in rock can be determined by using
13. The yeilding props which accept the maximum load with minimum yeild called
14. When roof is tapped with a stick, if ringing sound indicates the roof is
15. The coals of Telangana are graded on
16. The hydraulic props are specified by the
17. Length of flat base piece is . . . . . . . . used for setting props.
18. The fluid pH value used in hyraulic prop.
19. Which pillar will carry greater load.
20. Increase of water percolation from roof or increased flow of water indicates the need of
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