41. A person inhales . . . . . . . . 1/min, the O2 consumption . . . . . . . . 1/min, when doing hard work in pauses.
42. If the patient needs more than 30 1/min., draws additional air through the . . . . . . . . value on the mask, in reviving apparatus.
43. Laboratory experiments proved, suddenly comprising gas air mixture of containing as low as . . . . . . . . % and as high as . . . . . . . . % firedamp can be ignited and made explosive both the temp. and pressure raised simultaniously.
44. In very thick seams the thickness of coal is . . . . . . . .
45. The pressure of forcing fan has effect of keeping the gases in . . . . . . . .
46. For introduction of solid blasting need apporval from DGMS for exemption under following regulation.
47. Water infusion is one of the method of prevention of dust at the faces.
48. When coal dust propagates explosion . . . . . . . . as in case of gas explosion.
49. Coal more liable to spontanious heating when thesebands present
50. If the $$\frac{{CO}}{{{O_2}}}$$ deficiency ratio is 3% or more it indicates . . . . . . .
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 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 8
- Drilling and Blasting - Section 9
- Drilling and Blasting - Section 10