41. Which of the following is most suitable for opening up an underground mine?
42. The blasting technique used for controlled throw of overburden is known as
43. Exploration means
44. A bord and pillar panel will be developed with square pillars of size 25 m and an extraction ratio of 30%. The width of the gallery in m is
45. Why do we close the stoppings on intake & return airways simultaneously?
46. Minimum air velocity required at long wall face is
47. Breaking of coal in 'Hydraulic mining' is done by
48. Which metal is used for the purpose of Capping of Winding ropes?
49. Which of the following method is applicable to both metallic and non-metallic minerals?
50. Where seam thickness is more than 8 m and regular, dip < 60°, roof & floor is strong and coal is not liable to spon heating with easily cavable roof. Which of the following method is suitable?
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