11. Which of the following support has maximum linear progress? A. Timber prop B. Square chock C. Roof bolt D. Friction prop 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
12. Every ladder way used in a mine shall project above the mouth of at least A. 1.0m B. 1.5m C. 2.0m D. 0.5m 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
13. Which of the following is most difficult in opening up an opencast mine? A. Land area acquisition and rehabilitation B. Recruitment of manpower C. Green belt vegetation D. Selection of customer 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
14. In-situ ore of 1.5% Cu got diluted with waste rock of value 0.2% Cu. If the resultant extracted ore has 1.2% Cu. What is the percentage of dilution? A. 30 B. 25 C. 23 D. 20 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
15. Top slicing is an underhand caving method which is a variation of A. Breast stoping B. Shrinkage stoping C. Sublevel stoping D. Cut and fill stoping 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
16. The diameter of holes in mm commonly used for ring drilling by drifters in sublevel stoping is between A. 25 and 32 B. 33 and 44 C. 45 and 64 D. 65 and 100 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
17. Friction Clutch is used for A. Tail rope haulage B. Endless haulage C. Belt conveyor D. Scraper chain conveyor 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
18. The process that sends sand water mixture in underground coal depillaring district is known as A. Jigging operation B. Gravity separation operation C. Stowing operation D. Coal drawing operation 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
19. Which of the following method of mining is only applicable to non-coal mines? A. Bord and pillar mining B. Stope and pillar mining C. Sublevel stoping D. Long wall mining 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
20. As per CEA 2010, the length of flexible cable used in portable and transportable apparatus shall not be more than A. 50m B. 100m C. 200m D. 300m 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