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A growler is used on a machine armature to detect

  • A.an earth fault between winding and frame
  • B.the mechanical unbalance of the armature
  • C.a short-circuited coil
  • D.an open-circuited coil in the winding

Answer: C

Correct answer: a short-circuited coil

A growler applies an alternating field to the armature, and a shorted coil carries a large circulating current in response. The classic detection is a steel strip held over the slots, which vibrates and buzzes - the growl the instrument is named for - above the faulty coil.

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