Analog Electronics
The collector - emitter voltage is usually

  less than the collector supply voltage.
 equal to the collector supply voltage.
 more than the collector supply voltage.
 none of these.

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Analog Electronics
Optocouplers combine

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

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