81. In oldham cap lamp unit each cell of lead acid battery consists of a number of composite . . . . . . . . tubes.
82. A district mine ventilated by 30 m3/sec. Quantity of air and the wg in district is 25 mm. Find the resistance of the district.
83. The CO2 absorbent used in prototype breathing apparatus.
84. Which of the following refrigerant is used in u/g air conditioning plant.
85. In electric discharge lamps, a discharge in mercury vapour produces . . . . . . . . rays.
86. If the quantity of air required below ground is increased 1.5 times, the HP required to drive the fan varies as . . . . . . . .
87. The voltage of each battery of . . . . . . . . V in series in GL-60 flame safety lamp.
88. The magnetic lock bolt prevent the unscrewing . . . . . . . . by construction at the top end of the oil vessel.
89. In Dusty mines the dust content as per Russia Text Book . . . . . . . .
90. The disease which the muscles and nerves of the eyes are affected and there is oscilation of the eye balls . . . . . . . .
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