91. The average vertical stress in a coal pillar of a B & P panel is found to be 8 MPa. The depth of the pillar and the average density of overburden rock are 200 m and 2500 kg/m3 respectively. Assuming pillar stress to be the same in all coal pillars of that panel, the extraction ratio of the panel is
92. The Automatic Contrivance shall prevent the descending cage from being landed at pit bottom at a speed exceeding
93. Which of the following characteristics in blasting gallery method is essential to minimize mixing of waste rocks with coal?
94. In order to get better safety, the optimum gradient of a haul road is
95. The maximum number of coal faces in an underground bord and pillar development district is 13. The number of headings in the district is
96. The method of joining rope is known as
97. A longwall panel with a face height of 3.0 m and face length of 150.0 m is worked in 3 shifts per day employing 40 men per shift. The depth of the web of the shearer cutting coal is 0.5 m. The unit weight of the coal is 1.4 tonne/m3. Two full face cuts are executed per shift. The daily production from the panel in tonne is
98. The number of workmen's inspector in a large u/g coal mine
99. A tension crack of 5 m depth behind a rock slope crest is completely filled with water. What is the horizontal force exerted on a unit slope length by the water in the tension crack.
100. Rack & Pinion is used for
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