Analog Electronics
A voltage regulator is a circuit which

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

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 High resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 Low resistance when forward or reverse biased

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