91. A longwall face cut by double back shuffle method can be only worked with
92. What is the relationship between break-even stripping ratio (BESR) and ordinary stripping ratio (OSR)?
93. Which of the following unique mining method is known as novel method?
94. Which of the following factor is considered for calculation of cycle time of excavating machine such as shovel, drag line etc?
95. Which of the following method is still followed in maximum number of underground coal mines in India
96. Which of the following method may be approaching obsolescence and proved to be the most expensive of all mining methods?
97. The mining method used in thick and steep coal seam, where the slices are neither horizontal nor parallel to the inclination of the seam, is called
98. Size of pillars is decided based on
99. Why different types of explosives are not normally charged in the same shot hole?
100. Which of the following method is known as vertical crater retreat, VCR (patented) method?
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