Deck 11: RFID - Radio Frequency Identification

Question 1

To modulate a response signal using backscatter, a tag has to ______.

A) change the polarity of the incoming signal from the reader
B) deflect the signal from the transponder
C) change the characteristics of its own antenna
D) store the energy from the interrogator

Answer 1

C

Question 2

Which mode must an NFC-capable device be in to behave like a smart card?

A) Poll
B) Listen
C) Initiator
D) Smart card

Answer 2

B

Question 3

Interrogators and tags communicate using _________ communications.

A) half-duplex
B) full-duplex
C) simplex
D) complex

Answer 3

A

Question 4

The protocol used to handle collisions in HF RFID is called _____.

A) STAC
B) Class 1
C) Class 0
D) blocker

Question 5

One of the ways used by the Gen2 protocol to select tags is by transmitting _________.

A) a quiet command
B) a null CW
C) a bit mask
D) a higher or lower intensity signal

Question 6

Which of the following RFID technologies does not support reading more than one tag at a time?

A) readers
B) UHF
C) smart labels
D) LF

Question 7

Which of the following is an important characteristic of UHF passive tags?

A) They have a shorter read distance.
B) They require less power to be read.
C) They work at greater distances than most other tags.
D) They only support very slow communications.

Question 8

What is the purpose of an interrogator?

A) to read information from the tags
B) to prevent unauthorized access to the tags
C) to increase the read distance
D) to store a charge that powers passive tags

Question 9

RFID is not expected to have a major impact on network traffic.

Question 10

The function of RFID middleware is to ________.

A) store information about the types of tags used
B) convert the data read from the tags into a format that is compatible with that of the business application
C) control the functions of the reader hardware
D) control the functions of the tag hardware

Question 11

Reader antennas are sometimes designed for a specific application.

Question 12

What is one of the most critical challenges associated with RFID system implementation?

A) the cost of the tags
B) the fact that tags can be read by anyone with a smartphone
C) the large amount of storage required
D) the encryption protocols

Question 13

One of the main characteristics of sensory tags is that ______.

A) they can sense the presence of other tags
B) they can block the signal from other tags
C) they only respond to the reader if a password is sent first
D) they can capture information about environmental conditions

Question 14

What kind of modulation is used with most NFC tags?

A) OFDM
B) DSSS
C) ASK
D) NRZ-I

Question 15

What is the largest amount of memory in an NFC passive tag today?

A) 2 KB
B) 8 KB
C) 16 KB
D) 32 KB

Question 16

Which of the following methods can be used to temporarily or permanently disable a tag? (Select two.)

A) a blocker tag
B) an authentication password
C) a very-high-power pulse
D) the destroy password

Question 17

Before an NFC-enabled smartphone can communicate with a tag or another device, what must it do?

A) read the serial number of the other device
B) identify the capabilities of the device or tag
C) receive a reply from all devices within its range
D) transmit its clock speed

Question 18

What type of coupling is used in NFC between a smartphone and a tablet computer?

A) backscatter
B) capacitive
C) physical
D) inductive

Question 19

Which of the following is true about 1-bit tags?

A) They store a unique identification code.
B) They can only be read by a passive reader.
C) They do not carry any information about the product.
D) They are also known as RF fibers.

Question 20

The orientation of the tag's antenna usually does not affect readability.