Analog Electronics
The depletion region of a pn junction is one, that is depleted of

  mobiles charges.
  immobile charges.
  atoms.
  velocity of the carriers.

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Analog Electronics
Optocouplers combine

 IGBTs and MOSFETs.
 Power transistor and silicon transistor.
 SITs and BJTs.
  Infrared light emitting diode and a silicon photo transistor.

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