Power Systems
Water hamming process in pen-stocks results in

None of these
  noise increases, pressure increases, velocity decreases.
  noise increases.
  pressure increases.

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

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

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