Power Systems
Which of the following is/are the disadvantages of phase modifiers?

 Initial cost of synchronous phase modifier is higher
 It consumes both active and reactive power
All of these
 It requires more maintenance because of running equipment

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Power Systems
Half life is defined as

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

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