21. The systamatic timbering rules framed by the A. D.G.M.S B. Safety officer C. Mine manager D. Agent 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
22. The build up pump provided in hydrualic prop is comes under A. Open circuit B. Closed circuit C. Semiclosed circuit 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
23. The thickness of flat base piece not less than . . . . . . . . used for setting props A. 2 cm B. 3 cm C. 4 cm D. 5 cm 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
24. If the two bodies are held in contact and one moves with respect to the other, the force P for just moving the body is A. $$\frac{\mu }{Q}$$ B. $$\frac{Q}{\mu }$$ C. $${\mu Q}$$ D. $${\mu Q\phi }$$ 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
25. Compressive strength of curved resin A. 13.5 kg/mm2 B. 11.5 kg/mm2 C. 12.5 kg/mm2 D. 120 MN/m3 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
26. The support employed in semi parmanent and parmanent road ways. A. Shield B. Steel arches C. Roof bolting D. Props 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
27. In terms of resourcefulness [Reserveper km2] which of the Indian coal fields in on top position. A. Singrauli coal fields B. Singareni coal fields C. Raniganj coal fields D. Jharia coal fields 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
28. As for roof support DAST stands for A. Double acting signal telescope B. Double acting single telescope C. Direct applicable support transport D. Direct acquisition signal transport 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
29. The stored energy in the material called A. Malleability B. Resilience C. Toughness D. Brittlenes 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
30. The roof which will give warning before fracture. A. Coal B. Shale C. Sand stone D. Clay 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