Power Systems
Mercury is choice with steam in binary vapor cycle because

 higher saturation temperature than other fluids.
  all of above.
 relative low vaporization pressure.
 higher critical temperature and pressure.

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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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