Power Systems
Lightning arresters are used for

All of these
 protection of equipment from short circuits
 protection of equipment from open circuits
 protection of equipment from external lightning

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Power Systems
The VSWR of transmission line is

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

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