Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 1
 AD + BC = 0
 AD - BC = -1
 AD - BC = 0

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Power Systems
Half life is defined as

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

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