71. A place is not considered to be free from fire damp if the gas percentage is above . . . . . . . .
72. The basic working principle behind the aneroid barometer.
73. Hopcalite detector manufactured by the company.
74. The impurity in mine air way is
75. Minimum percentage of CO detects by multi gas detector in . . . . . . . . ppm.
76. CO forms explosive mixture with air present within the range nearly . . . . . . . . by vol.
77. The colour of hoomalite
78. In still air flame of a flame safety lamp is extinguished at CO2 percentage of . . . . . . . .
79. Number of blades in a single inlet centrifugal fan.
80. Identify the method for testing methane in mine are
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