Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Doubled.
 Halves.
  Increase but does not doubled.
 Decrease but does not halves.

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Power Systems
Per unit of any quantity is defined as

 base value of quantity /actual value of quantity in same units
 base value of quantity /actual value of quantity in different units
 actual value of quantity /base value of quantity in same units
 actual value of quantity /base value of quantity in different units

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