Analog Electronics
A voltage regulator is a circuit which

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

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Analog Electronics
In all base driver amplifiers

ac collector voltage is in phase with ac base voltage
None of these
ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage

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