• Drums with helical grooves
  • Plain cylindrical drums
  • Both are equally preferred
  • None of the above
  1. Lang’s lay is used as lifting or hoisting cable
  2. Lang’s lay is used in hauling operation in UG mines
  3. In regular lay, the wires & strands are laid in opposite to each other
  4. All of these
  1. Diameter of the wire rope in mm
  2. Number of strands in the wire rope
  3. Number of wires
  4. None of the above
  1. Fatigue failure
  2. Abrasive failure
  3. Both (a) & (b)
  4. None of the above
  • Rotary drilling
  • Percussive drilling
  • Rotary Percussive drilling
  • None of the above
  • Stopper drill
  • Jack-Hammer drill
  • Crawler Mounted Drill
  • Skid Mounted Drill
  1. hydraulic force
  2. pneumatic force
  3. electric drive
  4. electromagnetic drive
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