71. It eliminates drilling, blasting in opencast mines and has scope of selective mining. Identify the machine?
72. The stoping method, where a large part of blasted ore is allowed to accumulate in the stope to serve the purpose of providing working platform for stoping as well as to support the wall-rock, is known as
73. In a 4.2 m wide and 3.0 m high gallery in a coal seam, twelve shot holes are blasted per round. The holes are charged with 2 explosive cartridges of 435 g each. If the powder factor of the blast is 2.2 tonne/kg and specific gravity of coal is 1.4, the pull per round of blast in m is
74. What is the rate of stone dust loading per meter of shelf length for heavy type barriers?
75. The co-efficient of friction, Kilomurg (kμ) is the
76. The minimum size of barrier in between two panels is
77. Which of the following statement is true for panel system of working?
78. The track gauge width used for direct rope haulage in underground coalmine is
79. Reaction time of seismic detonators is
80. 'Soutirage' mining is the other name of
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