11. The CH4 emission from a prospective coal mine can be forcasted using
12. The distance required for complete mixing of methane in air by turbulent diffusion in a duct is given by the following equation +2% accuracy is
13. The percentage of O2 present in atmosphere by weight
14. The pressure developed by a mine fan is small and is measured by a manometer, the fluid used is . . . . . . . .
15. What should be the speed of air current when the wet bulb temperature exceeds 30.5°C
16. If CO2 replaces air by . . . . . . . .% loss of consciousness causes to person.
17. If the wet bulb temperature exceeds 30.5% at any place air current should be faster than . . . . . . . .
18. Acetylene lamp, burns when the oxygen percentage as low as . . . . . . . .
19. Air flow from high pressure range to low pressure range. The difference of pressure caused by purely natural means called . . . . . . . .
20. The generation of heat on the oxydation of CO to CO2 has utilised by the detector . . . . . . . .
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