Coal Mining - Study Mode
[#446] The departure of bore hole, whether vertical (or) inclined, from its course called
Correct Answer
(B) Deviation
[#447] When the stratas are well stratified sand stone or shales, the local fall will take place within . . . . . . . . hours, after withdrawal of supports.
Correct Answer
(C) 24 - 48
[#448] The operation of tracing of broken and lost parts in the hole and withdrawn to the surface
Correct Answer
(D) Fishing the bore hole
[#449] The DERDS cut coal is thrown on the AFC by
Correct Answer
(C) Cowl
[#450] The thickness of tubbing plates increased after every . . . . . . . .
Correct Answer
(C) 13 - 15 m