Power Systems
Zero sequence currents can flow from a line into a transformer bank if the windings are in

 delta / delta.
 star / grounded star.
 delta / star.
  ground star / delta.

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Power Systems
Which of the following is/are the advantages of synchronous phase modifier over the shunt compensation?

 smooth voltage regulation is possible by controlling excitation
 single unit can be used as both capacitance and inductor by adjusting the excitation
 initial cost is low
 both 1 and 2

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