Power Systems
The rate of rise of re-striking voltage is dependent upon

 capacitance of the system only
 inductance of the system only
 resistance of the system only
 both 1 and 2

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

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

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