Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 9000
 10
 1000
 90

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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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