Introduction To Mining Engineering - Study Mode
[#256] In a 4.2 m wide and 3.0 m high gallery in a coal seam, twelve shot holes are blasted per round. The holes are charged with 2 explosive cartridges of 435 g each. If the powder factor of the blast is 2.2 tonne/kg and specific gravity of coal is 1.4, the pull per round of blast in m is
Correct Answer
(C) 1.30
[#257] What is the rate of stone dust loading per meter of shelf length for heavy type barriers?
Correct Answer
(C) @ 60 Kg/m length of shelf
[#258] The co-efficient of friction, Kilomurg (kμ) is the
Correct Answer
(A) resistance or friction of an airway
[#259] The minimum size of barrier in between two panels is
Correct Answer
(C) equal to pillar size
[#260] Which of the following statement is true for panel system of working?
Correct Answer
(C) it has independent transport, ventilation and loading system