41. Inhalation of iron dust causes the disease called . . . . . . . .
42. Bulb of lead acid battery rated at . . . . . . . . V . . . . . . . . amps giving light output of . . . . . . . . lumens.
43. Relighting of lamp becomes trouble some in the following cases.
44. In a mine big roof fall taken place in main in take air way, fan drift water gauge.
45. Carbide lamps can withstand an air velocity of . . . . . . . . m/sec.
46. A meter candle is also termed as . . . . . . . .
47. The three parallel road ways have resistance of 9, 16, 25 ketomings respectively. Find the total resistance of the mine.
48. Weight of methalarm . . . . . . . . g.
49. In water gas explosion, the two highly explosive gases that are invovled are . . . . . . . .
50. Safety torches the glass is protected by a grill of . . . . . . . . mm wide brass plates in the mouth piece.
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