Analog Electronics
The electric current ICBO flows in the

  emitter and collector leads.
  none of them.
  collector and base leads.
  emitter and base leads.

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Analog Electronics
Optocouplers combine

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

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