Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.0030
 0.60
 0.30
 0.0060

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Power Systems
An impulse turbine

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

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