Discussion
Statement I: Collector-to-base feedback bias is more stable than fixed bias.
Statement II: It is as stable as voltage divider bias with an emitter resistor.
In the light of the above statements, choose the correct answer.
Answer: B
The first is true and the second is not: collector feedback improves on fixed bias by opposing current changes through the base drive, but the divider-and-emitter arrangement is better still because its operating point contains no device parameter at all. Ranking the arrangements by stability factor rather than by whether they have feedback is what distinguishes them, since all three of the better ones have some. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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