Coal Mining - Study Mode
[#151] Where sand stowing adopted for stowing the goaf maximum distance between packed goaf edge and face generally . . . . . . . . proper roof control.
Correct Answer
(D) 6 m
[#152] The gate belt conveyor centrally located to serve for two adjacent longwalls, progressing in same direction the combine face is
Correct Answer
(B) Double unit face
[#153] Which is used for raising and lowering of rods of square section
Correct Answer
(C) Retaining key
[#154] Hydrogenation of tar obtained by the process of
Correct Answer
(C) Fischer Tropsch process
[#155] Percussive drilling methods classified in to
Correct Answer
(A) 2