Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Air blast CB
 Vacuum CB
 Bulk oil type CB
 Sulphur hexafluoride CB

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Power Systems
A CANDU reactor uses

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

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