1. The face advances towards rise side is possible in longwall, if seam inclination less than.
2. Number of persons required to operate a electric drill machine
3. In horizon mining, the vertical distance between horizon is
4. Cuttings from bottom of holes removed by circulating fluid under pressure called
5. Discontinuity which separate the sid and sima layer of crust is known
6. Upto what gradient the bord and pillar mining adopted without special arrangements.
7. The departure of bore hole, whether vertical (or) inclined, from its course called
8. When the stratas are well stratified sand stone or shales, the local fall will take place within . . . . . . . . hours, after withdrawal of supports.
9. The operation of tracing of broken and lost parts in the hole and withdrawn to the surface
10. The DERDS cut coal is thrown on the AFC by
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