Home/Volume-1/Opencast Mining – 2 Volume-1 Opencast Mining – 2 Admin02/08/20240 214 Less than a minute Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 0% Opencast Mining Opencast Mining - 2 1 / 24 1. The method of estimation in which the shape and size of the ore can be estimated is called? Prospecting Boring Exploitation Exploration 2 / 24 2. The output from the surface continuous miner is.....million cu.m per year? 2 6 10 15 3 / 24 3. Wagon drill is used for the drill holes having depth of? Up to 3 m 3 - 15 m 15 - 25 m Beyond 25 m 4 / 24 4. For every degree of the angle of inclination with the vertical the saving in explosive consumption is? 1% 2% 3% 4% 5 / 24 5. Where dragline is used before starting excavation of coal a clear space of not less than...m shall be created? 3 4 5 6 6 / 24 6. The output capacity of the dragline with 4.5 to 7.5 cu.m is......million cu.m per year? 0.1 to 0.2 0.25 to 0.75 1.5 to 1.7 3 to 4.5 7 / 24 7. The limitation for the inclined drilling is? 10 deg off the vertical 30 deg off the vertical 45 deg off the vertical 60 deg off the vertical 8 / 24 8. The depth to which the extraction of mineral is done economically by OCP is called? Stripping ratio Breaeven stripping ratio Quarriable limit Economical depth 9 / 24 9. Horizontal ledges situated on the non-productive side of the open pit and serving to accommodate the transportation roads is called? Trench Berm Haul road None 10 / 24 10. Ripper can be compared with? Lawn mover Farmer's plough Tractor None 11 / 24 11. The fill factor for the Hydraulic shovel is? 75% 65% 80% 90% 12 / 24 12. The output of the shovel with 4.5 cu.m bucket is.......cu.m per year? 2.5 lac 4 lac 5.5 lac 7 lac 13 / 24 13. Jet piercing is suitable only for rocks? Low strength Laminated Good spallability None 14 / 24 14. The jack hammer is used for the drill holes (30mm to 40mm dia) ? Up to 10 m depth Beyond 10 m depth Up to 3 m depth Up to 6 m depth 15 / 24 15. For every 1 degree deviation in slope angle changes the volume of the quarried ground by above? 1% 2% 3% 4% 16 / 24 16. The shovel can dig below ground up to...? 2.5 m 4 m 5 m 6.5 m 17 / 24 17. The limiting dip for the shovel dumper combination? 4 deg 5 deg 6 deg 7 deg 18 / 24 18. For important haul roads the minimum factor of safety of the slope is? 1 1.5 2 2.5 19 / 24 19. The limiting gradient for the continuous surface miner is? 5 deg 7 deg 10 deg 12 deg 20 / 24 20. The dumped overburden is decoaled and should not roll down at coal benches when it assumes? Its momentum Its angle of repose Critical area Critical height 21 / 24 21. The output capacity of the dragline with 23 to 30 cu.m is......million cu.m per year? 0.1 to 0.2 0.25 to 0.75 1.5 to 1.7 3 to 4.5 22 / 24 22. When 2 discontinuities strike obliquely and intersect on the slope face......type failure of slope occurs? Plane Wedge Circular None 23 / 24 23. The angle of the slope of the bench wall from the horizontal is called? Bench slope angle Ultimate pit slope angle Angle of draw None 24 / 24 24. The limiting gradient for the dragline is? 8 deg 12 deg 16 deg 20 deg Your score is The average score is 50% LinkedIn Facebook Twitter 0% Admin02/08/20240 214 Less than a minute
