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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Analog Electronics
A Semiconductor has a

 Negative Temperature coefficient of resistance
 Positive Temperature coefficient of resistance
None of these
 Constant Temperature coefficient of resistance

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Negligible input resistance and high output resistance
Low input resistance as well as output resistance
High input resistance and low output resistance
Medium input resistance and high output resistance

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