81. Roadway re-utilisation is possible in longwall face.
82. For every 10 m length of horizontal pipe range there is a loss of . . . . . . . . head.
83. Multisection working in descending order employ longwall method of coal extraction with . . . . . . . . roofing.
84. Which drill machine can control flow of water during drilling
85. The type of permanent lining employed where running sand encountered during sinking
86. If the pillars are not strong, they may be crushed due to sudden pressure called
87. Geothermic gradient in high in
88. Tail gate supported by hydraulic props with 'I' section channel bars upto . . . . . . . . from face.
89. Where sand stowing adopted for stowing the goaf maximum distance between packed goaf edge and face generally . . . . . . . . proper roof control.
90. The gate belt conveyor centrally located to serve for two adjacent longwalls, progressing in same direction the combine face is
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