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An electronic ballast is preferred to a magnetic one because it

  • A.has a longer service life than a magnetic ballast
  • B.requires no power factor correction of any kind
  • C.loses less power and runs the lamp at high frequency
  • D.costs less to manufacture and to install

Answer: C

Its own loss is a few watts against ten or more, and the high frequency operation raises the lamp's own efficacy and removes the flicker. Its life is generally shorter and its cost higher, and it needs its power factor and harmonics attended to.

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