Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

  100 : 5 / √3.
 120 : 6 / √3.
  200 : 5 / √3.
 150 : 4 / √3.

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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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Power Systems
Which of the following statement is/are true?Zn

 nether 1 nor 2
 The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit
 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
 both 1 and 2

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