Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 10
 9000
 1000
 90

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Power Systems
A sodium graphite reactors use

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

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