Power Systems
On what factor does the performance of a circuit breaker depend?

  Breaking speed.
  None of these.
 Critical length of breaking.
  Both A and C.

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Power Systems
Critical mass is

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

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