ITPEC FE Morning April 2018 Question 72
ITPEC FE Morning April 2018 — Question 72 of 80
RFID system — how RF tags communicate with readers via electromagnetic fields
An RFID system consists of RF Tags (transponders) and RF Readers/Writers (interrogators). The reader generates an electromagnetic field that powers passive RF tags within range, allowing them to transmit stored information back to the reader wirelessly. This is the fundamental operating principle of RFID technology.
Why not others:
- a) RF Tags do not communicate with each other or form mesh networks — they only respond to reader queries.
- c) This describes GPS (Global Positioning System), which uses satellites for longitude/latitude tracking. RFID does not use satellites.
- d) RFID is a wireless technology, not wired. The claim about wired connection contradicts the core nature of RFID.
Key rule: RFID = reader powers passive tags via electromagnetic field; tags respond wirelessly — no batteries, no satellites, no mesh.
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