Analog Electronics
Depending upon the switching recovery time and on state drop, the power diodes are types

 General purpose, fast recovery.
  General purpose, fast recovery and schottly.
 Fast recovery, Schottky.
 None of these.

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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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