Analog Electronics
The positive part of the output signal in a transistor circuit starts clipping, if Q point of the circuit moves

  none of these.
  toward the saturation point.
  toward the center of the load line.
  toward the cutoff point.

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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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