In a 4.2 m wide and 3.0 m high gallery in a coal seam, twelve shot hol – McqOptions

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1.	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
A.	1.45
B.	1.70
C.	1.30
D.	4.06
Answer» D. 4.06

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