Power Systems
On what factor does the performance of a circuit breaker depend?

  Breaking speed.
  Both A and C.
 Critical length of breaking.
  None of these.

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Power Systems
A CANDU reactor uses

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

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