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.

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

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Power Systems
An impulse turbine

 makes use of a draft tube.
  operates by initial complete conversion to kinetic energy.
 always operates submerged.
 is most suited for low head and high discharge power plants.

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