11. D.C shaft is used for sending . . . . . . . . air.
12. The fluid commonly used in 'U' tube manometer of pressure difference is small.
13. The percentage of CO2 present in atomospheric air by weight
14. A portable optical methanometer has been designed and developed jointly by
15. Fans classified in to . . . . . . . . types.
16. Canaries or small birds can survive if O2 percentage is as low as . . . . . . . .
17. In rainy season maximum humidity in sea shore areas like Calcutta will be about
18. Mine air should contain minimum . . . . . . . .% O2.
19. The following equation explain the explosibility of mixture of combustable gasses
20. Black damp composition is
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