Discussion
Arrange the stages a signal passes through in a superheterodyne AM receiver.
1. The antenna and preselector
2. The mixer with its local oscillator
3. The intermediate frequency amplifier and filter
4. The envelope detector
5. The audio amplifier and loudspeaker
Select the correct sequence.
Answer: B
The chain runs 1, 2, 3, 4, 5, and every alternative breaks a dependency: the mixer cannot precede the antenna, the intermediate frequency amplifier cannot act before the translation that creates that frequency, and the detector cannot precede the filtering that defines the channel. Reading a block diagram against this order is the fastest way to locate a fault, since each stage's failure has a characteristic symptom.
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