Power Systems
Half life is defined as

 none of above.
  the time required for one half of isotope to decay.
 the time required for full of atoms in a specimen disintegrate.
 the time required to spiliting of a heavy nucleus.

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

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

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