11. The support not gives warning of impending roof failure.
12. The self advancing supports are used in coal mines on prop free front long wall faces and are introduced in India in . . . . . . . . colliery.
13. Supporting system used in coal mine gate roads in general is
14. Compressive strength increases with
15. Catalyst tube used in capsule bolting made of
16. The shale roof some times gives a ringing sound, if thick ness of shale greater than . . . . . . . .
17. Weight of hydraulic prop.
18. Rock burst occur in
19. It is the load at which an axially loaded prop reaches its elastic limit or at which it begins to buckle.
20. The bearing plate is made of
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