11. The support not gives warning of impending roof failure. A. Wooden prop B. Roof bolt C. cog D. Tapered prop 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
12. The self advancing supports are used in coal mines on prop free front long wall faces and are introduced in India in . . . . . . . . colliery. A. Sudhamdih B. Monidih C. Chinakuri D. Seetarampur 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
13. Supporting system used in coal mine gate roads in general is A. Steel archs B. Steel props C. Powered supports D. Rock bolts E. None of these 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
14. Compressive strength increases with A. Lateral stress B. Longitudinal strain C. Shear stress D. Torsion strain 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. Catalyst tube used in capsule bolting made of A. Wood B. Glass C. Nylon D. Polyster 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
16. The shale roof some times gives a ringing sound, if thick ness of shale greater than . . . . . . . . A. 0.1m B. 0.2m C. 0.5m D. 0.3m 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. Weight of hydraulic prop. A. 50 kgf B. 62 kgf C. 72 kgf D. 85 kgf 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. Rock burst occur in A. Shallow mines B. Deep mines C. Inclines D. None 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
19. It is the load at which an axially loaded prop reaches its elastic limit or at which it begins to buckle. A. Yeild load B. Setting load C. Clamping load D. Load bearing capacity 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
20. The bearing plate is made of A. Mild steel B. Bronze steel C. Carbon steel D. Nickel 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