1. Specific gravity of H2S
2. For a person working in an atmosphere containing 21% O2, the exhaled air contains 4.5% CO2 and 16% O2. The respiratory quotient of breathing is
3. An air sample taken from the return airway of a district contains the following gases. The Graham's ratio for the district is
Gas
CO2
H4
O2
N2
CO
Concentration %
0.4
1.17
19.92
78.49
0.02
| Gas | CO2 | H4 | O2 | N2 | CO |
| Concentration % | 0.4 | 1.17 | 19.92 | 78.49 | 0.02 |
4. In an underground working area, CH4 and CO2 are normally expected to be found respectively
5. The centrifugal fan types are . . . . . . . .
6. The maximum wet bulb temperature in u/g mines is
7. A mixture of specially prepared manganese dioxide and copper oxide called
8. A mine worker inhales normal air; whereas, the exhaled air contains 16.65% O2 and 3.83% CO2. The respiratory quotient of breathing for the worker is
9. The chemical Hopcalite used in
10. Air at a density of 1.2 kg/m3 flows in a straight duct such that the velocity at the centre is 12.5m/s. the method factor for the velocity profile is known to be 0.80. The velocity pressure value in the duct in Pa is
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