Analog Electronics
In all base driver amplifiers

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

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Analog Electronics
Optocouplers combine

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

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Analog Electronics
The common-source JFET amplifier has

  no voltage gain.
  a high input impedance and a very high voltage gain.
  a very high input impedance and a relatively low voltage
  a high input impedance and a voltage gain less than 1.

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