Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

None of these
 this expression is true for any line
 this must be a short line
 this may either be a medium line or short line

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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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