Analog Electronics
A JFET can operate in

  none of these.
  depletion and enhancement mode only.
  enhancement mode only.
  depletion mode only.

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Analog Electronics
Optocouplers combine

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

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