Power Systems
The characteristic impedance of a transmission line is

 Directly proportional to its length.
 Independent of its length.
 Directly proportional to square root of its length.
 Inversely proportional to square root of its length.

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Power Systems
Critical mass is

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

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