Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching

  air blast.
  vacuum.
  SF6.
  oil.

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Power Systems
Critical mass is

  minimum mass of fissionable material required to sustain chain reaction.
 a mass of fissionable material required to stop a chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.
 none of these.

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