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

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

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Power Systems
Half life is defined as

 the time required for full of atoms in a specimen disintegrate.
 none of above.
  the time required for one half of isotope to decay.
 the time required to spiliting of a heavy nucleus.

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