Analog Electronics
The CE amplifier circuit are preferred over CB amplifier circuit because they have

  none of these.
  lower amplification factor.
  high input resistance and low output resistance.
  larger amplification factor.

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Analog Electronics
Optocouplers combine

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

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