Power Systems
For transmission line which one of the following relation is true?

 AD - BC = -1
 AD + BC = 0
 AD - BC = 0
 AD - BC = 1

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Power Systems
Critical mass is

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

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