Power Systems
When reactance grounding is used in network, the voltage between neutral and ground is

 IN × Xn
 both 1 and 3
 IR0 × Xn
 3×IR0 × Xn

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Power Systems
Per unit of any quantity is defined as

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

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