41. Air crossings in gassy coal mines should be . . . . . . . .
42. The country rock present above the vein.
43. For ventilating a heading, drift or tunnel.
44. Electronic anemometers measure air velocities in . . . . . . . . ranges.
45. The pit bottom layout withstand . . . . . . . .
46. Spot coolers used in mining cooling capacity varies from . . . . . . . . in Kcal/hour.
47. Explosive mixture of gasses is one, which when once ignited, will allow the flame to be self propagated through out the mixture, independent and away from source of ignition called . . . . . . . .
48. Static gauge pressure at the inlet of any duct is
49. Surface screening plant and tipplers should be at least . . . . . . . . away from the intake shaft.
50. Simplified form of gas mask is
Read More Section(Drilling and Blasting)
Each Section contains maximum 100 MCQs question on Drilling and Blasting. To get more questions visit other sections.
- Drilling and Blasting - Section 1
- Drilling and Blasting - Section 2
- Drilling and Blasting - Section 3
- Drilling and Blasting - Section 4
- Drilling and Blasting - Section 5
- Drilling and Blasting - Section 6
- Drilling and Blasting - Section 7
- Drilling and Blasting - Section 9
- Drilling and Blasting - Section 10