Analog Electronics
A voltage regulator is a circuit which

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

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Analog Electronics
For an NPN transistor in normal bias

  the emitter junction has high resistance.
  only majority carriers cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  only holes cross the collector junction.

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