31. Familier lighting tube is discharge lamp called . . . . . . . . discharge tube.
32. Fire brigades should carry out fire fighting practices at least in energy.
33. Modern safety lamps can with stand an air velocity of . . . . . . . .
34. Silica is crucial component in determining dust hezard because it is . . . . . . . .
35. Calculate the w.g of a fan has to develop for ventilation tunnel under following conditions. The surface area is 2160 m3; Area = 7.2 m2. Coeff. of resistance 0.00161 mm of wg/m3. Quantity of air passing is 6 m3/sec.
36. How many number of steel rods protected at the outer glass of oil flame safety lamp.
37. The battery can relight the lamp . . . . . . . . times in the hot lamp by use of graded filament.
38. The lamp which provided relighting arrangement.
39. The thickness of the permanent water dam is . . . . . . . .
40. In depillaring areas the flood lighting in deg.I gassy mines . . . . . . . . m at floor level.
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