1. The minimum length of sleeper used as chock support of the roof height to be supported excess of 3m.
2. The preferred shape of an opening in uniaxial stress field as
3. In coal mines roof consists of chiefly
4. Most of the Gondwana coals from any field are rich in . . . . . . . .
5. Critical area of extraction not depend on the following
6. Which prop can serve a long life for sand stowing faces.
7. It is that load, which is set by a setting device, imparted by an yeilding prop.
8. Timber bar errected on to the coal pillar . . . . . . . .
9. The prop is erreeted in flat seams
10. Freshly exposed roof after blasting is effectively and quickly supported by
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