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A bar-to-bar test on a commutator locates

  • A.an earth fault between the winding and the shaft
  • B.the mechanical unbalance of the armature assembly
  • C.the temperature rise the machine reaches on load
  • D.an open or high-resistance armature coil

Answer: D

Measuring the resistance between successive segments round the commutator reveals the pair whose coil is faulty as a departure from the otherwise uniform readings. Blackening of the same segments in service is the corroborating evidence.

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