Discussion
Why is a preselector placed before the mixer?
Answer: C
The preselector's two jobs are attenuating the image frequency before it can reach the mixer, and keeping strong out-of-band signals from overloading it. Main selectivity belongs to the intermediate frequency strip, which is the point of converting in the first place. The intermediate frequency is set by the oscillator's offset, not by the preselector. And injection level is the oscillator's own affair. A stage placed before a mixer can only help with problems the mixer would otherwise create, and the image is the chief one.
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