21. Internationally accepted value of standard atmospheric pressure in SI units is . . . . . . . . N/m2.
22. The percentage of oxygen present in mine atmospheric air by volume.
23. How much O2 inhaled by a healthy person
24. The instruments helpful for proper control of mine ventilation, ones environmental conditions for human work are
25. Every main mechanical ventilator, there should be of . . . . . . . . indipendent electric circuits for power supply to it.
26. A well designed evasee increases the . . . . . . . . of far.
27. Modern flame safety lamp can withstar an air velocity of in m/s.
28. The flame safety lamp is used for detecting.
29. Critical pressure of CO
30. SO2 is . . . . . . . . gas
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