21. U tube manometers are not useful for measurement of gas velocities below . . . . . . . .
22. The oil used in flame safety lamps, in line with DGMS approved.
23. Highest flood level with respect to mine surface level is
24. The Non toxic gas is
25. In mine return air depleted in oxygen content and contaminated by . . . . . . . .
26. Capacity of power pack in D6 methanometer
27. Density of air at 15°C and 760 mm Hg is
28. Mechanical mixture of inflammable gases given of from coal called
29. Stink damp relates to
30. The birds are affected much earlier than man by . . . . . . . .
Read More Section(Mine Ventilation)
Each Section contains maximum 100 MCQs question on Mine Ventilation. To get more questions visit other sections.