Power Systems
Mho relay is used for the protection of

 no length criterion.
  long transmission lines.
 short length lines.
 medium length lines.

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Power Systems
The VSWR of transmission line is

  Directly proportional to load impedance and inversely to characteristic impedance.
 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.

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