Power Systems
Alternate formation and breakage of bubbles are called

  water hamming.
  cavitations.
All of these
  surgfication.

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  fault current and restraining coil current.
  fault current and operating coil current.
  operating coil current and restraining coil current.
  number of turns of restraining and operating coil.

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