11. The supervisory staff in coal mines therefore required to undergo periodical eye testing once in . . . . . . . . years. A. 1 B. 2 C. 4 D. 5 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
12. Anthra cosis comes under inorganic dust producing group of . . . . . . . . A. Fibrosis producing B. Non-fibrosis producin C. Toxic D. All 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. The maximum air velocity at the face is . . . . . . . . A. 1.7 m/s B. 3 m/s C. 5 m/s D. 6 m/s 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. The type of flame safety lamps is permitted by DGMS for gas testing in Deg.1 and Deg.2 gassy mines of coal. A. GL-4 B. GL-5 C. GL-50 D. GL-54 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
15. Sudden irush of water into active workings of the mine. A. Subsidance B. Water flow C. Inundation D. Rainwater 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. Worst disaster caused by inundetion of mines was at chasnala colliery in Bihar in . . . . . . . . A. 1976 B. 1975 C. 1974 D. 1977 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
17. Find the H.P assistancedue to NVP if the w.g is 12.07 mm of wg and air passing in DC shaft is 100m3/sec. A. 15.09 B. 14.08 C. 16.09 D. 17.09 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
18. The thickness and height of temporary dam is . . . . . . . . A. 0.5; 1m B. 1m; 1m C. 1m; 3m D. 1m; 2m 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
19. Lumens emitted by a lamp . . . . . . . . A. MSCP × 2π B. MHCP × 4π C. $$\frac{{MSCP}}{{4\pi }}$$ D. MSCP × 4π 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. In which of the following Indian mines first refrigeration plant was installed in A. Champion reef B. Oorgam C. Majri D. Nudy doorg 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