In the case where the voltage bases are same the new per unit impedanc – McqOptions

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1.	In the case where the voltage bases are same the new per unit impedance is obtained from the formula:
A.	\(Z_{pu}^{new} = \frac{{Z_{pu}^{old}S_B^{old}}}{{S_B^{new}}}\)
B.	\(Z_{pu}^{new} = \frac{{Z_{pu}^{old}S_B^{new}V_B^{old}}}{{S_B^{old}V_B^{new}}}\)
C.	\(Z_{pu}^{new} = \frac{{Z_{pu}^{old}S_B^{new}}}{{S_B^{old}}}\)
D.	\(Z_{pu}^{old} = \frac{{Z_{pu}^{new}S_B^{new}}}{{S_B^{old}}}\)
Answer» D. \(Z_{pu}^{old} = \frac{{Z_{pu}^{new}S_B^{new}}}{{S_B^{old}}}\)

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