Power Systems
Electrostatic precipitators in thermal power plants are used for

 removal of ash from flue gas
All of these
 remove moisture from the cole
 control flow rate

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

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

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