31. Regulator can not be placed in . . . . . . . . A. Junctions B. Haulage roads C. Travelling roads D. Seats of aevon 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
32. The venture tube blower having a convergent - divergent tube is more efficient and increase the flow of air by A. 20% B. 30% C. 35% D. 40% 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
33. Which of the following detonators are used mostly in oil and mineral prospecting? A. Plain detonators B. Electric short delay detonators C. Ordinary long delay detonators D. Seismic detonators 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
34. Ammonium Nitrate does not occur in nature and it is prepared by reacting with ammonia gas with . . . . . . . . acid. A. Benzene B. Tolune C. Potasium Nitrate D. Nitric 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
35. The fan efficiency is given by . . . . . . . . A. $$\frac{{{\text{Brake HP}}}}{{{\text{air HP}}}}$$ B. $$\frac{{{\text{air HP}}}}{{{\text{Break HP}}}}$$ C. $$\frac{{{\text{HP of ventilation}}}}{{{\text{HP input}}}}$$ D. 3m 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
36. Permitted explosives used in mines have a VOD ranging from in m/sec. A. 1000 - 1500 B. 2500 - 5000 C. 6000 - 8000 D. 5000 - 6000 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
37. Minimum quantity of air required for ventilation of coal mine depends on A. Production of coal B. Man power employed C. Cooling power 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
38. The coolest used in 1 hr. apparatus of proto mark V apparatus. A. MNCl2 B. Soda phosphate C. CaCl2 D. NHCl2 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
39. Shape factor is defined by . . . . . . . . A. $$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{2}}}}}$$ B. $$\frac{{{\text{Perimeter}}}}{{{\text{Area}}}}$$ C. $$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{3}}}}}$$ D. $$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{4}}}}}$$ 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
40. The quantity of air has to be increased from 1500m3 to 3000 m3/mm, what will be effect on H. P of the fan. A. 2 B. 4 C. 8 D. 16 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