Volume 3 Section 1

14 Questions

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Volume 3 Section 1

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Questions and Answers
  • 1. 
    The maximum number of avionics units the Military Standard 1553B data bus is capable of transferring data between is
    • A. 

      16

    • B. 

      25

    • C. 

      32

    • D. 

      64

  • 2. 
    Which element of the Military Standard 1553B data bus gathers and formats information from aircraft sensors for transfer on the data bus?
    • A. 

      Monitor

    • B. 

      Bus controller

    • C. 

      Remote terminal

    • D. 

      Backup controller

  • 3. 
    A backup bus controller on the Military Standard 1553B data bus is
    • A. 

      Mandatory and must be active at the same time as the primary bus controller

    • B. 

      Mandatory and must not be active at the same time as the primary bus controller

    • C. 

      Optional and may be active at the same time as the primary bus controller

    • D. 

      Not required for normal operation, but is required on the modern data buses

  • 4. 
    What does an optical data bus use as the controlling protocol for high-speed message transfer?
    • A. 

      MIL-STD-3910B

    • B. 

      MIL-STD-1553B

    • C. 

      Optic transceiver

    • D. 

      Star coupler

  • 5. 
    When the bus controller detects a transmission error while communicating with a RT on the Military Standard 1553B data bus, the bus controller
    • A. 

      Retransmits the command several times, and then tries the backup bus

    • B. 

      Is disabled and the backup controller resumes transmission

    • C. 

      Attempts to retransmit to the RT until contact is made

    • D. 

      Establishes communication with a different RT

  • 6. 
    Which element of the Military Standard 1553B data bus is not usually used in avionics bus systems?
    • A. 

      Remote terminal

    • B. 

      Bus controller

    • C. 

      Stub coupler

    • D. 

      Bus monitor

  • 7. 
    Which type of data bus stub is most suitable for stubs less than one foot in length on the Military Standard 1553B data bus?
    • A. 

      Transformer-coupled stub with external coupling network

    • B. 

      Transformer-coupled stub with internal coupling network

    • C. 

      Directed-coupled stub with external coupling network

    • D. 

      Directed-coupled stub with internal coupling network

  • 8. 
    The superior type of dat bus stub on a Military Standard 1553B data bus is the
    • A. 

      Transformer-coupled stub with external coupling network

    • B. 

      Transformer-coupled stub with internal coupling network

    • C. 

      Directed-coupled stub with internal coupling network

    • D. 

      Directed-coupled stub with external coupling network

  • 9. 
    Each type of word used on the Military Standard 1553B data bus is
    • A. 

      20 bits long with a 3-bit sync character, 16 information bits, and one parity bit

    • B. 

      16 bits long with a 3-bit sync character, 12 information bits, and one parity bit

    • C. 

      10 bits long with a 2-bit sync character, seven information bits, and one parity bit

    • D. 

      8 bits long with a 2-bit sync character, 5 information bits, and one parity bit

  • 10. 
    In a Military Standard 1553B data bus command word, the filed that refers to a function or area within the remote terminal to which the command is being directed is the
    • A. 

      Address filed

    • B. 

      Subaddress / mode field

    • C. 

      Transmit / receive bit field

    • D. 

      Word count / mode code field

  • 11. 
    Information describing the condition of a RT on a Military Standard 1553B data bus is transmitted as a
    • A. 

      Command word in response to a command from the RT

    • B. 

      Data word in response to a command from the bus controller

    • C. 

      Status word in response to a command from the bus controller

    • D. 

      Data word in response to a command from the backup controller

  • 12. 
    The word count field in a controller-to-RT transfer message on the Military Standard 1553B data bus must correspond to the number of
    • A. 

      Status word the RT transmit to the bus controller

    • B. 

      Data words the RT receives from the bus controller

    • C. 

      Status words the RT receives from the bus controller

    • D. 

      Command words the RT transmits to the bus controller

  • 13. 
    After the receiving RT on a Military Standard 1553B data bus has received and validated the data words from the transmitting RT during an RT-to-RT transfer, it
    • A. 

      Transmits a command word to indicate receipt of the message

    • B. 

      Responds with a status word indicating a successful transfer

    • C. 

      Responds with a data word indicating a successful transfer

    • D. 

      Transmits a data word to the transmitting RT

  • 14. 
    During mode command transfers on a Military Standard 1553B data bus, the word count / mode code field identifies the
    • A. 

      Particular mode command being implemented by the RT

    • B. 

      Particular mode command being implemented by the bus controller

    • C. 

      Number of data words to be transferred by the bus controller

    • D. 

      Number of data words to be received by the RT