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Mining Engineering Coal Mining Difficulty: Medium

The saw toothed crown, drill holes of diameter not less than . . . . . . . . are possible.

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For remote control the coal drill furnished with iii single pole . . . . . . . . switch. Sound, pressure level is measured in What shall be the minimum distance between the detaching hook & the detaching plate where a geared engine is used and the cage is at its normal position at the top of the shaft? The attachment of the winding rope to the drum, depth indicator, cages, gates examined once in atleast every . . . . . . . . hours. Before erecting cogs in depillaring area, props shall be errected at the . . . . . . . . of each cog