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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Power Systems
ACSR means

 Aluminium copper steel reinforced
 Aluminium conductor steel reinforced
 all conductor steel reinforced
 Aluminium core steel reinforced

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