Introduction To Mining Engineering - Study Mode
[#381] In connection with the precautions where gas exists, all apparatus, including portable and transportable apparatus used at any place within "A" meters of any workings or goaf in case of 3 rd degree gassy mine. A is given by
Correct Answer
(C) 270 m
[#382] What percentage of (CO formed/O 2 absorbed) ratio indicates existence of heating?
Correct Answer
(B) 1%
[#383] What is the main reason to support a slip or fault plane on its both sides?
Correct Answer
(B) a slip or fault plane is the line of fracture of strata & very difficult to hold it
[#384] The attachment called "Backstay" is used with
Correct Answer
(A) underground haulage
[#385] Which of the following method employ horizontal openings?
Correct Answer
(A) room and pillar mining