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Mining Engineering Drilling And Blasting Difficulty: Medium

For a seam inclined, 60° steep, 2 m thin the method of goaf control employed. For a frequency of vibration 3 - 300 cycle/sec the PPV safe for structure is Rocks said to be floggy if bedded planes are separated by No. of drills employed in shaft sinking The fans of 760 mm size, backward bladed, what should be the maximum allowable gap between the impeller and the impeller inlet.