Power Systems
Half life is defined as

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

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

 nether 1 nor 2
 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
 both 1 and 2
 The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit

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