Practice Test Geeks(AET) Aircraft Electronics Technician Practice Test
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Data Bus Systems and Protocols Flashcards

7 cards from real AET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the data transfer rate of ARINC 429 operating in high-speed mode?

    Answer: 100 kbps

    ARINC 429 high-speed mode operates at 100 kbps, while its low-speed mode operates at 12.5 kbps.

  2. Which data flow topology best describes ARINC 429?

    Answer: Unidirectional point-to-multipoint bus

    ARINC 429 is a unidirectional bus where a single transmitter sends data to up to 20 receivers simultaneously.

  3. How many bits are contained in a standard ARINC 429 data word?

    Answer: 32 bits

    An ARINC 429 data word is 32 bits long, consisting of an 8-bit label, SDI, data field, SSM, and a parity bit.

  4. What does the 8-bit 'label' field in an ARINC 429 word identify?

    Answer: The type or parameter of data being transmitted

    The 8-bit label field identifies the type of data or avionics parameter (e.g., airspeed, altitude) contained in that word.

  5. Which encoding scheme is used by ARINC 429?

    Answer: Bipolar Return to Zero (BPRZ)

    ARINC 429 uses Bipolar Return to Zero (BPRZ) encoding with three voltage states: HIGH (+10 V), NULL (0 V), and LOW (−10 V).

  6. What is the maximum number of receivers that can be connected to a single ARINC 429 transmitter?

    Answer: 20

    A single ARINC 429 transmitter can drive up to 20 receivers on one unidirectional bus.

  7. What information does the SSM (Sign/Status Matrix) field provide in an ARINC 429 word?

    Answer: Data sign and equipment operational status

    The SSM field provides the sign of the numeric data and indicates the operational status (e.g., normal, failure warning) of the transmitting equipment.