31. The company J. K. Dey and sons manufactures of three types of flame safety lamps are . . . . . . . .
32. In the metal mines . . . . . . . . persons are worstly affected by dust.
33. In water barrier must contain atleast . . . . . . . . of water per sq.m. of road way cross section.
34. The unit of illumination is S. I unit.
35. Can we use the defective, or repaired components of flame safety lamp.
36. No. of washers employed to make outer glass assembly by air tight.
37. The minimum average standards of lighting in main junctions in underground in lumens/sq. ft.
38. Dustiness of a place may be considered at dustyness content of . . . . . . . . the air is moderatly dusty as per Russian text book.
39. The co. efficient of adhesion is, if the surface is dry and free of sand.
40. The fuel recommended to carry the percentage test by flame safety lamp.
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