Power Systems
Per unit of any quantity is defined as

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

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Power Systems
Half life is defined as

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

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