Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 Synchronous line
 Asynchronous line
 both 1 and 2
 No need of same frequency for exchange of power

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Power Systems
Half life is defined as

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

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