Blasting || QUESTIONS WITH COMPLETE
SOLUTIONS!!
Sheathed explosive unit: A device consisting of an approved or permissible explosive covered by
a sheath encased in a sealed covering and designed to be fired ____ the confines of a borehole.
correct answers outside
Permissible explosives and sheathed explosive units shall not be used underground when they
are below the minimum firing ___ specified by the approval. correct answers temperature
The cars or vehicles shall be marked with warnings to identify the contents as explosive. The
warnings shall be readily visible to miners approaching from ___ direction and in indelible letter.
correct answers all
When explosives and detonators are transported by hand they shall be carried in ___
noncunductive, closed containers. correct answers separate, substantially built
Except as provided in 75.1313, explosives and detonators taken underground shall be kept in
separate, closed magazines at least ___ feet apart correct answers five
Explosives and detonators not used during the shift shall be returned to a ___ by the end of the
shift. correct answers magazine
No more than ___ sheathed explosives units shall be fired at one time. correct answers three
Each borehole in coal for explosives shall be at least ___ inches from any other borehole and
from any free face, unless prohibited by the thickness of the coal seam. correct answers 24
Battery powered equipment shall be removed to at least ___ feet from these locations before
priming of explosives. correct answers 50
When two working faces are approaching each other, cutting, drilling, and blasting shall be done
at only one working face at a time if the two faces are within ___ feet of each other. correct
answers 25
Only a ___ punch shall be used when priming explosive cartridges. correct answers non
sparking, non conductive
When loading other boreholes, the primer cartridge shall be the ___ cartridge loaded in the
borehole. correct answers first
The total weight of explosives loaded in a borehole less than 6 feet deep in bituminous and
lignite mines shall be reduced by ___ pound for each foot for borehole less than 6 feet. correct
answers 1/2
SOLUTIONS!!
Sheathed explosive unit: A device consisting of an approved or permissible explosive covered by
a sheath encased in a sealed covering and designed to be fired ____ the confines of a borehole.
correct answers outside
Permissible explosives and sheathed explosive units shall not be used underground when they
are below the minimum firing ___ specified by the approval. correct answers temperature
The cars or vehicles shall be marked with warnings to identify the contents as explosive. The
warnings shall be readily visible to miners approaching from ___ direction and in indelible letter.
correct answers all
When explosives and detonators are transported by hand they shall be carried in ___
noncunductive, closed containers. correct answers separate, substantially built
Except as provided in 75.1313, explosives and detonators taken underground shall be kept in
separate, closed magazines at least ___ feet apart correct answers five
Explosives and detonators not used during the shift shall be returned to a ___ by the end of the
shift. correct answers magazine
No more than ___ sheathed explosives units shall be fired at one time. correct answers three
Each borehole in coal for explosives shall be at least ___ inches from any other borehole and
from any free face, unless prohibited by the thickness of the coal seam. correct answers 24
Battery powered equipment shall be removed to at least ___ feet from these locations before
priming of explosives. correct answers 50
When two working faces are approaching each other, cutting, drilling, and blasting shall be done
at only one working face at a time if the two faces are within ___ feet of each other. correct
answers 25
Only a ___ punch shall be used when priming explosive cartridges. correct answers non
sparking, non conductive
When loading other boreholes, the primer cartridge shall be the ___ cartridge loaded in the
borehole. correct answers first
The total weight of explosives loaded in a borehole less than 6 feet deep in bituminous and
lignite mines shall be reduced by ___ pound for each foot for borehole less than 6 feet. correct
answers 1/2
