AET Digital Electronics 2

Question 1

What is the primary characteristic of the ARINC 429 data bus used in commercial aviation?

Accepted Answer

Unidirectional single transmitter to multiple receivers

Answer

Bidirectional multi-master bus

Answer

Full duplex Ethernet

Answer

Half-duplex with collision detection

Question 2

What word length does ARINC 429 use for each data transmission?

Accepted Answer

32 bits

Answer

8 bits

Answer

16 bits

Answer

64 bits

Question 3

What does a flip-flop circuit do in digital avionics systems?

Accepted Answer

Stores a single bit of data

Answer

Converts analog to digital

Answer

Amplifies digital signals

Answer

Generates clock pulses

Question 4

In avionics software, what does DO-178C define?

Accepted Answer

Software development and assurance levels for airborne systems

Answer

Hardware qualification requirements

Answer

EMI testing procedures

Answer

ARINC data word formats

Question 5

What is the function of a data concentrator unit (DCU) in a modern avionics suite?

Accepted Answer

Collect, process, and route data from multiple avionics sensors to display systems

Answer

Generate navigation data

Answer

Provide electrical power conversion

Answer

Control autopilot servos

Question 6

What does the term 'LRU' stand for in avionics maintenance?

Accepted Answer

Line Replaceable Unit

Answer

Low Range Unit

Answer

Local Radio Unit

Answer

Load Regulation Unit