Question 1

To modulate a response signal using backscatter, a tag has to ______.&#10;A) change the polarity of the incoming signal from the reader&#10;B) deflect the signal from the transponder&#10;C) change the characteristics of its own antenna&#10;D) store the energy from the interrogator

Accepted Answer

To modulate a response signal using backscatter, the tag has to change the characteristics of its own antenna. This change in characteristics results in a reflection of the signal back to the reader, which is then decoded to retrieve the information stored in the tag. Changing the polarity of the signal, deflecting the signal, or storing energy from the interrogator do not allow for modulation of the response signal using backscatter.

Question 2

Which mode must an NFC-capable device be in to behave like a smart card?&#10;A) Poll&#10;B) Listen&#10;C) Initiator&#10;D) Smart card

Accepted Answer

An NFC-capable device must be in Listen mode to behave like a smart card. In Listen mode, the device can respond to requests from an Initiator device, such as a point-of-sale terminal or a mobile phone, and communicate information such as payment credentials or identification data.

Question 3

Interrogators and tags communicate using _________ communications.&#10;A) half-duplex&#10;B) full-duplex&#10;C) simplex&#10;D) complex

Accepted Answer

Interrogators and tags typically communicate using half-duplex communications, where data transmission can occur in both directions, but not simultaneously.

Question 4

The protocol used to handle collisions in HF RFID is called _____.&#10;A) STAC&#10;B) Class 1&#10;C) Class 0&#10;D) blocker

Accepted Answer

The protocol used to handle collisions in HF RFID is called STAC (Slot Time Anti-Collision). It is designed to allow multiple tags to communicate with a reader without interfering with each other. Class 1 and Class 0 are standards for RFID tags, while a blocker is a device used to block RFID signals.

Question 5

One of the ways used by the Gen2 protocol to select tags is by transmitting _________.&#10;A) a quiet command&#10;B) a null CW&#10;C) a bit mask&#10;D) a higher or lower intensity signal

Accepted Answer

The Gen2 protocol selects tags by transmitting a bit mask, which specifies a pattern that tags must match to respond, allowing for efficient and selective communication with a subset of tags within a reader's range.

Question 6

Which of the following RFID technologies does not support reading more than one tag at a time?&#10;A) readers&#10;B) UHF&#10;C) smart labels&#10;D) LF

Accepted Answer

LF (low frequency) RFID technology does not support reading more than one tag at a time because the reader sends out a low frequency signal that can only interrogate one tag within its range at a time. UHF (ultra-high frequency) RFID technology, on the other hand, can read multiple tags at once due to its ability to emit a high-frequency signal and use anti-collision protocols to differentiate between tags. Smart labels are essentially RFID tags with integrated circuitry and can be compatible with various RFID frequencies. Readers are devices used to communicate with RFID tags and can support single or multiple tag reading depending on the technology used.

Question 7

Which of the following is an important characteristic of UHF passive tags?&#10;A) They have a shorter read distance.&#10;B) They require less power to be read.&#10;C) They work at greater distances than most other tags.&#10;D) They only support very slow communications.

Accepted Answer

UHF passive tags are known for their ability to work at greater distances compared to most other RFID tags, which is a significant advantage in many applications such as inventory management and asset tracking.

Question 8

What is the purpose of an interrogator?&#10;A) to read information from the tags&#10;B) to prevent unauthorized access to the tags&#10;C) to increase the read distance&#10;D) to store a charge that powers passive tags

Accepted Answer

The purpose of an interrogator is to read information from the tags.

Question 9

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

Accepted Answer

RFID systems generate a significant amount of data as they track the movement and status of objects in real time, which can increase network traffic as this data is transmitted, processed, and stored.

Question 10

The function of RFID middleware is to ________.&#10;A) store information about the types of tags used&#10;B) convert the data read from the tags into a format that is compatible with that of the business application&#10;C) control the functions of the reader hardware&#10;D) control the functions of the tag hardware

Accepted Answer

The primary function of RFID middleware is to convert the data read from the tags into a format that is compatible with that of the business application. This allows for seamless integration of the RFID technology into existing systems and processes. While RFID middleware may store information about the types of tags used, it is not its primary function. It does not control the functions of the reader or tag hardware.

Question 11

Reader antennas are sometimes designed for a specific application.

Accepted Answer

The answer of Reader antennas are sometimes designed for a...

Question 12

What is one of the most critical challenges associated with RFID system implementation?&#10;A) the cost of the tags&#10;B) the fact that tags can be read by anyone with a smartphone&#10;C) the large amount of storage required&#10;D) the encryption protocols

Accepted Answer

The answer of What is one of the most critical...

Question 13

One of the main characteristics of sensory tags is that ______.&#10;A) they can sense the presence of other tags&#10;B) they can block the signal from other tags&#10;C) they only respond to the reader if a password is sent first&#10;D) they can capture information about environmental conditions

Accepted Answer

The answer of One of the main characteristics of sensory...

Question 14

What kind of modulation is used with most NFC tags?&#10;A) OFDM&#10;B) DSSS&#10;C) ASK&#10;D) NRZ-I

Accepted Answer

The answer of What kind of modulation is used with...

Question 15

What is the largest amount of memory in an NFC passive tag today?&#10;A) 2 KB&#10;B) 8 KB&#10;C) 16 KB&#10;D) 32 KB

Accepted Answer

The answer of What is the largest amount of memory...

Question 16

Which of the following methods can be used to temporarily or permanently disable a tag? (Select two.)&#10;A) a blocker tag&#10;B) an authentication password&#10;C) a very-high-power pulse&#10;D) the destroy password

Accepted Answer

The answer of Which of the following methods can be...

Question 17

Before an NFC-enabled smartphone can communicate with a tag or another device, what must it do?&#10;A) read the serial number of the other device&#10;B) identify the capabilities of the device or tag&#10;C) receive a reply from all devices within its range&#10;D) transmit its clock speed

Accepted Answer

The answer of Before an NFC-enabled smartphone can communicate with...

Question 18

What type of coupling is used in NFC between a smartphone and a tablet computer?&#10;A) backscatter&#10;B) capacitive&#10;C) physical&#10;D) inductive

Accepted Answer

The answer of What type of coupling is used in...

Question 19

Which of the following is true about 1-bit tags?&#10;A) They store a unique identification code.&#10;B) They can only be read by a passive reader.&#10;C) They do not carry any information about the product.&#10;D) They are also known as RF fibers.

Accepted Answer

The answer of Which of the following is true about...

Question 20

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

Accepted Answer

The answer of The orientation of the tag's antenna usually...

Deck 11: RFID - Radio Frequency Identification