Power Systems
Which of the following statements is/are true? Corona is reduced by

 increasing the distance between the conductor
All of these
 decreasing the supply frequency
 increasing the radius of the conductor

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Power Systems
Half life is defined as

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

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