Analog Electronics
When a reverse bias is applied to gate of JFET the depletion region width

  is wider near the source and tapers near the drain.
  is uniform in the channel.
  is wider near the drain and tapers near source.
None of these

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Analog Electronics
Optocouplers combine

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

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