Questionare on CMR & CMA
Questionare on CMR & CMA Q1. Which cut is used for solid blasting in Indian coal Mines a) Fan cut b) burn cut c) wedge cut d) drag cut Q2. Permitted explosives are safe to use because a) They have less strength b) they have low velocity of detonation c) they do not produce much noise during blasting d) special chemical are used to extinguish the spark produced during blasting. Q3. Burden is the distance between a) Two blast holes in same row b) distance between two rows c) distance between first row of blast holes and bench d) d) none of the above Q4. Which of the following explosive have maximum strength a) ANFO b) TNT c) RDX d) Nitroglycerine Q5. To measure the performance of blasting which factor is calculated a) Tonnage factor b) space factor c) stripping ratio d) Powder factor Q6. What is the formula for blast ability? a) B = c / t b)B=t / c c) B = c + t d) B= c X t