- Bench height
- Nature of strata to be broken
- Length of burden
- Length of NONEL
(d) Length of NONEL
- Shelter
- Magazine
- Store
- First aid roopm
(b) Magazine
- Free face to the holes blasted at first delay
- For better alignment by providing the center line
- For gas pressure release
- None of the above
(a) Free face to the holes blasted at first delay
- TNT
- Gun powder
- ANFO
- Pentolite
(b) Gun powder
- Wave pressure and Poisson’s ratio
- Wave pressure and density of the medium
- Propagation velocity and Poisson’s ratio
- Propagation velocity and density of the medium
(D) Propagation velocity and density of the medium
- They have less strength
- They have low velocity of detonation
- They do not produce much noise during blasting
- They conten sheathing agent
(d) They conten sheathing agent
- Critical diameter
- Optimal diameter
- Rapid burning but not an explosion
- Change in the inclination of drill hole
(a) Critical diameter
- Rapid explosion
- Burning and explosion
- Rapid burning but not an explosion
- Change in the inclination of drill hole
(c) Rapid burning but not an explosion
- Two blast holes in same row
- Distance between two holes blasted at same delay
- Distance between first row of blast holes and bench crest
- Distance between two holes blasted in consecutive delay
(c) Distance between first row of blast holes and bench crest
- As a primer with the bulk SME explosives
- As a primer in underground coal mine
- As a primer in blasting-of the solid
- None of the above
(a) As a primer with the bulk SME explosives
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