91. Stirrup is used for
92. Which type drill bit suitable for soft rock
93. Upward drivage of shaft carried out for a distance up to
94. The diameter of steel rope used for rope drilling is
95. For given parameter the greatest area of support offer by
96. Face formed which is developed on bord and pillar method and extracting in longwall retreating with stowing method.
97. Which life of pipe serves in sand stowing for 4 - 8 lac ton of sand.
98. The tubbing plate is strengthened with
99. Time taken to settle the goaf.
100. Bumps are classified in to . . . . . . . . types.
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