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This chapter is from the book

This chapter is from the book

Exam Prep Questions

  1. An RFID interrogator is also called an

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    A.

    RFID radiator

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    B.

    RFID tag

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    C.

    RFID reader

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    D.

    RFID transistor

  2. When are the anticollision protocols used?

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    A.

    To avoid the collisions between vehicle-mounted interrogators

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    B.

    To avoid the collisions that can occur when multiple readers attempt to read the same RFID tag

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    C.

    To avoid the collisions that can occur when multiple tags respond to the interrogation at the same time

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    D.

    To avoid the collisions between the data sent through the RFID system network

  3. Which is not a part of an RFID interrogator?

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    A.

    Power amplifier

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    B.

    Controller/processor

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    C.

    Inlay

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    D.

    Oscillator

  4. What are the kinds of polarity of RFID antennas?

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    A.

    Circular

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    B.

    Horizontal linear

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    C.

    Vertical circular

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    D.

    Vertical linear

  5. What is the difference between bi-static and mono-static antennas?

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    A.

    A mono-static antenna radiates power only in one direction, whereas a bi-static antenna is omnidirectional.

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    B.

    A mono-static antenna performs a transmitting function as well as a receiving function, whereas a bi-static antenna includes two antennas sometimes within one case, including separate receiving and transmitting antennas.

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    C.

    A mono-static antenna requires AC power input, whereas a bi-static antenna requires DC power input.

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    D.

    A mono-static antenna is only one antenna in a case, whereas a bi-static antenna also includes two side antennas next to the main antenna in the case.

  6. What is the relation between reading and writing to a tag?

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    A.

    Reading takes less time than writing to a tag.

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    B.

    Writing to a tag takes less time than reading the tag.

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    C.

    Reading and writing both require the same time.

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    D.

    The time ratio of writing to a tag and reading the tag depends on the frequency at which the interrogator operates.

  7. What is an antenna gain?

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    A.

    An antenna, due to its design, radiates the RF signal stronger than the power input. This is called antenna gain.

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    B.

    Antenna gain is calculated as the power gained from the reader multiplied by the operating frequency of the reader.

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    C.

    Antenna gain is achieved by focusing the radiated RF signal into narrower patterns to get more power coming from the antenna in the required direction.

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    D.

    Antenna gain is achieved by focusing the radiated RF signal into wider patterns because the antenna gain is measured as the size of the area where the signal is present.

  8. When is the likelihood of communication with a tag maximized?

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    A.

    When the tag is placed as close to the antenna as possible

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    B.

    When the tag is placed in the antenna sweet spot

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    C.

    When the tag is static and is in the antenna's radiation field

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    D.

    When the tag is moving through the antenna's radiation field

  9. When using a multiplexer, why use solid state circuitry for switching?

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    A.

    Mechanical switching is too costly and requires a huge amount of space.

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    B.

    Solid state circuitry is smaller and requires less space.

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    C.

    Due to the extreme volume of switching required, a mechanical switch would not be feasible because the switching would occur many times a second; therefore, the wear and stress on the mechanical switch would be too great for reliability.

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    D.

    Solid state circuitry can withstand abuse better than a mechanical switch.

  10. What is a Faraday cage?

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    A.

    The term Faraday cage refers to the construction of the portal with the sides and top being made of mesh materials so that the signal can travel in all directions.

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    B.

    The meaning of the term Faraday cage originated from the town Faraday, Louisiana, where local shipping agents needed to have a way of packaging products that would not be readable by interrogators. The cage was constructed of metal that would reflect the antenna's signal, causing interference.

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    C.

    A Faraday cage is a tunnel enclosed in RF-reflective material, such as sheet metal. This helps contain the RF signal inside the tunnel.

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    D.

    A Faraday cage is a device that holds a package on a conveyor system in order to be assured of an accurate read.

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