Power Systems
Skin effective is more in case of

 power lines
 same in both cases
 communication lines
None of these

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Power Systems
Critical mass is

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

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Power Systems
In hydroelectric power plants

 both operating and initial cost are high.
  operating cost is low and initial cost is high.
 operating cost is high and initial cost is low.
 both operating and initial cost are low.

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