Power Systems
Advantages of per unit system is/are

 Need of transformation ratio
 It has units for all quantities
 No units for any quantity
All of these

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Power Systems
The VSWR of transmission line is

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

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