Power Systems
Non-commercial sources of energy are

None of these
  wood, animal wastes and agricultural wastes.
 solar, wind and biomass.
 fossil fuel, hydro power and nuclear power.

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

 nether 1 nor 2
 both 1 and 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

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