21,The minimum ppm of CO detected by CO detectors is?,
3,
5,
10
50,
22,In M.S.A CO detector which tubes are used?,
P.S detector tubes,
Hopcolite,
Hoolamite,
None,
23,Which is formed in stangnent water in old workings in the areas of gob?,
CH4,
SO2,
H2S,
CO2,
24,H2S is aslo called as?,
stink damp,
Marsh gas,
choke damp,
white damp,
25,when mixed with air H2S forms on explosive mixture the limits of inflamability is ?,
5 - 15,
4.3 - 45,
12 - 75,
4.5 - 75,
ANS: 2,1,3,1,2
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