In the given block diagram of a receiver, Figure, identify the boxes labelled as X and Y and write their functions.

Explanation

(a) 'X' represents Intermediate Frequency (IF) stage while 'Y' represents an Amplifier.
(b) At IF stage, the carrier frequency is changed to a lower frequency and in this process, the modulated signal is detected. While the function of amplifier is to amplify the detected signal which may not be strong enough to be made use of and hence is required.