91. At zero-oxygen balance, the ratio of oxidizers to fuel ratio for ANFO is
92. What is the minimum requirement of percentage of oxygen at any place in the mine where persons are required to work or pass?
93. As per Mine Rules 1955 every shelter shall have a floor area of not less than:
94. Which of the following statutory provision restrict the propagation of hazards from one development district to other part of the bord and pillar mine?
95. Seams with bad roof having strata control problems is suitable for
96. The drilling method which can apply for most wider range of depth is
97. The place in mine, where explosive is stored is called
98. Main difference in VRM and Blast Hole stoping is
99. Lateral surface strain profile (SP) caused due to extraction of a longwall panel can be approximated by
100. Which of the following gas in known as 'Marsh Gas'?
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