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
 both 1 and 2
 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in different units
 actual value of quantity /base value of quantity in same units
 base value of quantity /actual value of quantity in same units

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