Discussion
Assertion (A) : In the super heterodyne receiver, the signal voltage is combined with local oscillator voltage and normally converted into a signal of a lower fixed frequency.
Reason (R) : The intermediate frequency of receiving system may be neither low or high, but in a certain range between the two.
Answer: A
The key marks both statements as true, with the reason explaining the assertion. In a superheterodyne receiver the incoming signal is mixed with the local oscillator voltage, and the difference frequency is converted to a fixed lower frequency, the intermediate frequency, where amplification and selectivity are easier. The choice of that frequency is a compromise: it should not be too low, because image rejection gets poorer, and it should not be too high, because selectivity gets poorer, so it lies in a range between the two, which is why the reason explains why a fixed intermediate frequency of that kind is used. The answer is that both are true and (R) is the correct explanation of (A).
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