91. Most of the hydraulic props for use in mines do not incorporate the following devices.
92. During depillaving operations, if the roof is laminated, local fall occurs . . . . . . . . hours after props are withdrawn
93. In thick seam when its thickness is equal to or more than . . . . . . . . m in Indian coal seams.
94. Jharia coal fields occupies an area of
95. The prop offers the maximum . . . . . . . . to roof.
96. Which roof is treacherous and most unreliable in mines.
97. The support provides a continuous cover all along the face by canopies placed side by side called
98. Support system design based on RMR depends on the following.
99. Maximum heating value of coal depend on the percentage is
100. In a tunnel 2 m × 2 m; the support of weak strata near a dyxe, intrusion is done by
Read More Section(Mine Supports and Strata Control)
Each Section contains maximum 100 MCQs question on Mine Supports and Strata Control. To get more questions visit other sections.