Analog Electronics
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current

 decreases by a factor of 6.
  remains almost the same.
 increases by a factor of 6.
 is zero.

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Analog Electronics
Optocouplers combine

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

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