1. If the orebody is large, rib pillars are left at the ends (sides) of the stope, a sill pillar at the bottom and a crown pillar at the top. Sometimes these pillars are recovered in subsequent mining. Name the suitable method of mining
2. Stacker is commonly used to work in association with
3. The costliest stoping method is
4. Which of the following has direct impact on the turnout of face loading machine?
5. In Metalliferous mines, during extraction of ore and any other mineral, the working height of the bench shall not exceed A m and angle of slope should not exceed B m from the horizontal. A & B are given by
6. Positive Set Valve (PSV) is used to overcome the operator error in
7. A coal seam in India is said to be thick when the thickness is more than
8. Which of the following is an item of u/g coalmine support?
9. Which of the following occur first in underground coal mines?
10. The ratio of length of explosive column to the hole diameter which will work as a spherical charge, is
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