Power Systems
Which of the following relays is/are unit protection relays?

 Buccholz relays
 over current relays
 Differential relays
 both 1 and 2

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Power Systems
A sodium graphite reactors use

  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as moderator.
 a mixture of sodium and graphite as coolant.
 sodium as moderator and graphite as coolant.

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