Power Systems
A guard ring is used in string type insulator having 3 units to improve string efficiency. Find the capacitance of metal link 2 if pin to earth capacitance of each unit is 1 F?

 2 F
 0.5 F
 4 F
 1 F

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Power Systems
Critical mass is

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