71. The standard of lighting required for heavy earth moving machinery work place.
72. Benefication of Indian bituninous coal helps in . . . . . . . .
73. It is always desirable to keep the width of the floor of bench much larger than . . . . . . . . of bench.
74. The height of sakhi should not exceed . . . . . . . .
75. The angle of the slope of bench wall from horizontal.
76. Best one of stability dump monitoring is
77. Flying of rock is controlled by
78. The height of bench is decided by
79. Equipment which has to work from one site over long periods in a shift may be operated by . . . . . . . .
80. Crawler chain machines are allowed to cross public roads if they posses.
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