- 1.66
- 2.99
- 2.50
- 3.32
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) A coal heading 4m wide and 2.5m high has an advance of 1m per blast round. The amount of explosive used in blasting is 6 kg. taking specific gravity of coal as 1.5, the powder factor (tonne/kg) is
Solution:
(c) 2.50
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