41. For testing a specimen in laboratory the length and diameter ratio should be A. More than 1 : 2 B. More than 2 : 1 C. Less than 2 : 1 D. Less than 1 : 2 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
42. Depression of Ground surface called A. Angle of draw B. Slope angle C. Subsidence D. Safe cover Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
43. In resin capsule the mixture hardens within . . . . . . . . seconds and become solid. A. 50 - 60 B. 40 - 50 C. 30 - 40 D. 20 - 30 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
44. The guide rail of Alimak raise climber is fixed on the wall by A. Grouting B. Expansion shell bolts C. Slot and wedge D. Profo, bolts Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
45. The roof in coal mines tested by A. Visual test B. Hearing test C. Tapping test D. Vibration test Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
46. As the bit gauge decreases. A. Rate of penetration increases B. Rate of penetration decreases C. First increase and then decrease slowly D. First decrease slowly and increase fastly Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
47. In the tapered prop, length of tapeing at one end is . . . . . . . . A. 100 - 125mm B. 125 - 190mm C. 200 - 500mm D. 600 - 900mm Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
48. Fibre glass rock bolts have gained wide popularly in . . . . . . . . mining. A. Coal B. Oil C. Metal D. All Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
49. The roof is easily cavable, if the protodyakov index is . . . . . . . . A. 4 - 6 B. 6 - 7 C. 7 - 8 D. 8 - 9 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
50. A base lifting device for some of the shield support is required in longwall face; when A. Caring is intensive B. AFC capacity not adequate C. Shield base is heavy D. Soft floor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board