41. A person inhales . . . . . . . . 1/min, the O2 consumption . . . . . . . . 1/min, when doing hard work in pauses. A. 40 - 50; 1.8 - 2.3 B. 60 - 90; 2.7 - 4 C. 15 - 20; 0.6 - 0.9 D. None 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
42. If the patient needs more than 30 1/min., draws additional air through the . . . . . . . . value on the mask, in reviving apparatus. A. Outle B. Byepass C. Reducing D. Inlet 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
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. A. 2%; 75% B. 3%; 80 C. 2.5; 65 D. 5; 79% 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
44. In very thick seams the thickness of coal is . . . . . . . . A. 1.5m - 4.5 B. 4.5 - 9 C. 1.2 - 2m D. Beyond 9m 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
45. The pressure of forcing fan has effect of keeping the gases in . . . . . . . . A. Face B. Goaf andold workings C. Junctions D. Raises 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
46. For introduction of solid blasting need apporval from DGMS for exemption under following regulation. A. 173 B. 175 C. 168 D. All 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
47. Water infusion is one of the method of prevention of dust at the faces. A. No B. Yes C. Some times No and sometimes correct D. None 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
48. When coal dust propagates explosion . . . . . . . . as in case of gas explosion. A. Flame back B. Flame up C. Flame down D. Flame front 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
49. Coal more liable to spontanious heating when thesebands present A. Vltrain B. Durain C. Fusain D. Clairain 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
50. If the $$\frac{{CO}}{{{O_2}}}$$ deficiency ratio is 3% or more it indicates . . . . . . . A. Existance of self heating B. Gradual oxydation C. Heating in advanced stage D. Active fire 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
