Analog Electronics
IGFET is a

  linear device.
  square - law device.
  half - power device.
  3 / 2 power - low device .

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Analog Electronics
Optocouplers combine

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

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Analog Electronics
In all base driver amplifiers

None of these
ac collector voltage is 180° out of phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage

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