41. What is the standard of lighting at pit bottom of Indian mines?
42. The ground in central portion of the subsidence trough is subjected to
43. V.C.R is a modified version of
44. A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes
45. The Draw point spacing in caving method is dependent on
46. Water spraying at coalface before & after short firing is mandatory, why so?
47. In which of the following thick seam mining method, roof sag and initiation of spon heating is maximum seen?
48. Best suited mining method for thick vein/massive deposit with strong ore, strong walls and steep dip is
49. Which of the following hazards is met when the roof exposure during depillaring operation becomes more than 90 m2
50. When a double ended ranging drum shearer cuts coal in a longwall face,
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