Power Systems
Which of the following insulator is practically used for railway crossings?

 strain insulator
All of these
 pin insulator
 string insulator

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

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