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A vibration test on a machine measures

  • A.the insulation resistance of the machine's windings
  • B.the efficiency of the machine at its rated output
  • C.the amplitude and frequency of shaft and bearing movement
  • D.the temperature rise of the bearings under load

Answer: C

Correct answer: the amplitude and frequency of shaft and bearing movement

A vibration test records how much the machine moves and at what frequencies, and the frequency content is the diagnostic part: unbalance appears at running speed, misalignment usually at twice it, bearing defects at their own characteristic frequencies, and electrical faults at twice supply frequency.

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