Power Systems
The insulation of the modern EHV lines is designed based on

 R × I.
 the lighting voltage.
  the switch voltage.
 corona.

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Power Systems
The VSWR of transmission line is

 Proportional to load and characteristic impedance.
 Directly proportional to characteristic impedance and inversely to load impedance.
  Directly proportional to load impedance and inversely to characteristic impedance.
 Directly proportional to voltage minimum and inversely proportional to voltage maximum.

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