Coal Mining - Study Mode
[#211] VCR modified revision is
Correct Answer
(B) Sublevel stoping
[#212] Heavy roof fall even premature collapse may take place if line of goaf is
Correct Answer
(C) Parallel to fault
[#213] Gallaries which are heightend, widended should be supported by row of props . . . . . . . . meter aparts and chocks . . . . . . . . meter apart.
Correct Answer
(A) 1.2, 3
[#214] Drilling with manual labour without help of power is suitable upto a depth of
Correct Answer
(B) 30 m
[#215] The life C.I. pipes used in sand stowing is . . . . . . . . lac ton of sand.
Correct Answer
(B) 4 - 8