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?

 4 F
 1 F
 2 F
 0.5 F

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Power Systems
A thermal power station needs space

 less than that required by the diesel power station of same output.
 less than that required by atomic power station of the same output.
 less than that required by a gas turbine power plant of same output.
  less than that required by hydro-power station of same capacity.

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