21. The CO2 absorbent placed in breathing bag, weights of absorbent is . . . . . . . . A. 1 kg B. 2 kg C. 3 kg D. 1.5 kg 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
22. The road header machines are capable of cutting rock which are not . . . . . . . . A. Very hard B. Very soft C. Paste D. All 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
23. Cordex is a A. Detonator B. Detonating Relay C. Detonating fuse D. Booster E. Primer 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
24. Class 'B' fires involve liquids generally quenched by . . . . . . . . A. Foam B. Dry powder C. Sand D. CO2 gas 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
25. Oxygen gas liquifies at . . . . . . . . A. -100°C B. -283°C C. -183°C D. -483°C 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. Safe working velocity should not exceed at places where carbide lamps used . . . . . . . . A. 2.5 m/sec B. 5 m/sec C. 8 m/sec D. 10 m/sec 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
27. In hosemask, a currugated tube between the mask and air tube or rubber . . . . . . . . A. 30 - 70m B. 30 - 100m C. 20 - 80 m D. 30 - 60 m 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
28. These type of explosives not used in under ground coal mines. A. Permitted B. Non permitted C. Powdery D. High explosives of permitted 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
29. The temporary stoping have to be buitt in places which are free from . . . . . . . . movements and cracks. A. Gas B. Water C. Fire D. Ground 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. Every mine should have at least. A. One entry B. Two entrances C. Three entrances D. Four entrances 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