Mine Supports And Strata Control - Study Mode
[#131] Most of the hydraulic props for use in mines do not incorporate the following devices.
Correct Answer
(B) To charge the capacity of prop
[#132] During depillaving operations, if the roof is laminated, local fall occurs . . . . . . . . hours after props are withdrawn
Correct Answer
(C) 4 - 10
[#133] In thick seam when its thickness is equal to or more than . . . . . . . . m in Indian coal seams.
Correct Answer
(A) 4.8
[#134] Jharia coal fields occupies an area of
Correct Answer
(D) 453.24 km 2
[#135] The prop offers the maximum . . . . . . . . to roof.
Correct Answer
(B) Resistance