Power Systems
In an induction relay for a particular current setting the operating time 4 sec. When the time multiplier setting is 0.8 if the time multiplier setting is rest to 1 the operating time is

  1.
 10.
 5.
  un changed.

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Power Systems
A CANDU reactor uses

  natural uranium as fuel and heavy water as moderator and coolant.
 only fertile materials.
 highly enriched uranium as fuel and water as moderator and coolant.
 enriched uranium as fuel and ordinary water as moderator and cooler.

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