Power Systems
What type of back up protection is used for alternators?

  Impedance relay.
  Buchholz relay.
  Mho relay.
  IDMT relay.

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Power Systems
The skin effect shows that

 current density is more at the surface of the condutor
 current density is more at the centre of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is lower at the surface of the condutor

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

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

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