61. The dustiness in dwellings is accumulate about . . . . . . . .
62. Destressing is a method of . . . . . . . . prevention in underground metal mines.
63. Bending moment of contiliver beam is maximum at . . . . . . . .
64. Cap lamp must able to produce an illumination of . . . . . . . .
65. The minimum average standards of lighting in road ways in underground in lumens/sq.ft.
66. The blade angle of fan is 78°, it denotes that fan is . . . . . . . .
67. Silicosis and asbestosis are comes under inorganic dust producing disease group of . . . . . . . .
68. The main purpose of the wire gauze in flame safety lamp is to prevent passage of flame from . . . . . . . .
69. As the number of dust particles per cm3 of air this method called as . . . . . . . .
70. Number of cylindrical glasses in GL-5 flame safety lamp
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