Power Systems
Which of the following insulator is practically used for railway crossings?

 pin insulator
 string insulator
All of these
 strain insulator

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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.
 enriched uranium as fuel and ordinary water as moderator and cooler.
 only fertile materials.

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