What term describes a wireless device that both transmits and responds to incoming signals?

What term describes a wireless device that both transmits and responds to incoming signals?

• A. Transmitter
• B. Receiver
• C. Transponder
• D. Repeater

Answer: (C)

A transponder is a device that both receives an incoming signal and automatically sends back a response. The name itself reflects its dual role as a transmitter and a responder, often replying on a different frequency or with coded data. This automatic reply distinguishes it from the other options: a transmitter only sends; a receiver only listens; a repeater simply relays the received signal to extend range without generating a dedicated response. In contexts like radar or RFID, the transponder specifically “answers” the interrogation, which is why this term fits best.

A transponder is a device that both receives an incoming signal and automatically sends back a response. The name itself reflects its dual role as a transmitter and a responder, often replying on a different frequency or with coded data. This automatic reply distinguishes it from the other options: a transmitter only sends; a receiver only listens; a repeater simply relays the received signal to extend range without generating a dedicated response. In contexts like radar or RFID, the transponder specifically “answers” the interrogation, which is why this term fits best.