Power Systems
In a pressurized water reactor

  both B and C.
 the coolant water boils in the reactor core.
 water is used at high pressure so that it is available is liquid from at about 280° C.
 heavy water is used as both coolant and moderator.

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

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

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Power Systems
An impulse turbine

 is most suited for low head and high discharge power plants.
  operates by initial complete conversion to kinetic energy.
 makes use of a draft tube.
 always operates submerged.

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