Analog Electronics
A voltage regulator is a circuit which

  converts the AC voltage to DC voltage.
None of these
  smoothed the AC variation in DC output voltage.
  maintains constant DC output voltage inspite of the fluctu

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Analog Electronics
Conventional biasing of a BJT has

  EB forward biased and CB reversed biased.
  EB reversed biased and CB reversed biased.
  EB forward biased and CB forward biased.
  EB reversed biased and CB forward biased.

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