Analog Electronics
The AC base voltage of an emitter follower is across the

  emitter diode and external AC emitter resistance.
 load resistor.
 DC emitter resistor.
 emitter diode.

ANSWER DOWNLOAD EXAMIANS APP

Analog Electronics
Optocouplers combine

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

ANSWER DOWNLOAD EXAMIANS APP