Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 16.
 12.
  24.
 6.

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Power Systems
A CANDU reactor uses

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

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