Power Systems
Advantages of per unit system is/are

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

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Power Systems
The VSWR of transmission line is

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

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