Which of the following is not a function performed by a radio receiver?

• A. Transmission
• B. Reception
• C. Selection
• D. Detection

Answer: (A)

The key idea is understanding what a radio receiver actually does versus what a transmitter does. A receiver’s job is to pick up signals from the air and turn them into usable information. It starts by capturing RF energy with an antenna (reception), then tunes and filters to focus on the desired frequency or channel (selection), and finally demodulates or detects the modulation to recover the original audio or data (detection). It does not generate or send signals on its own, it only processes signals it receives.

Transmitting, on the other hand, is the function of a device that creates and sends out signals. So, the action of transmitting is not something a standalone radio receiver performs. If a device can both send and receive, that’s a transceiver, which combines both roles, but a pure receiver handles reception, selection, and detection, not transmission.