Analog Electronics
If the emitter resistance decreases, the

 current gain increases.
 Q point stays where it is.
  Q point moves up.
 collector current decreases.

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Analog Electronics
Optocouplers combine

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

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