Analog Electronics
If the current gain is unknown in an emitter-biased circuit, you cannot calculate the

  base current.
 emitter voltage.
 emitter current.
 collector current.

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Analog Electronics
Optocouplers combine

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

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