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electronics and communication engineering exam question papers
1. An amplitude modulated signal occupies a frequency range from 395 kHz to 405 kHz. If can be demodulated by which of the following?
(A): Low pass filtering with cut off at 400 kHz
(B): Multiplying with a 395 kHz local signal
(C): Multiplying with a 405 kHz local signal
(D): Using an envelope detector and filter
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