AET Digital Electronics and Microprocessors 3

Question 1

Which test instrument captures and simultaneously displays multiple digital signal states to aid in troubleshooting microprocessor-based avionics?

Accepted Answer

Logic analyzer

Answer

A logic analyzer captures multi-channel digital signals and displays them as timed waveforms, making it ideal for debugging data bus and microprocessor faults.

Question 2

What is the primary purpose of BITE (Built-In Test Equipment) in avionics systems?

Accepted Answer

It continuously monitors and tests system functions automatically

Answer

BITE continuously monitors avionics LRU health, generates fault codes, and stores maintenance data to assist technicians in diagnosing failures quickly.

Question 3

What distinguishes a microcontroller from a standalone microprocessor?

Accepted Answer

A microcontroller integrates CPU, memory, and I/O peripherals on a single chip

Answer

A microcontroller combines the CPU, RAM, ROM, and I/O ports onto one chip, making it a self-contained computing system suitable for embedded avionics control.

Question 4

Why is EEPROM commonly used for storing calibration and configuration data in avionics line replaceable units (LRUs)?

Accepted Answer

It can be electrically erased and reprogrammed in-circuit without physical removal

Answer

EEPROM allows data to be updated in the field using standard avionics programming tools without removing the memory chip from the circuit.

Question 5

When a logic probe indicates a 'pulsing' or 'active' state at a test point, this means the signal is:

Accepted Answer

Rapidly toggling between HIGH and LOW states

Answer

A pulsing indication on a logic probe means the probe is detecting transitions between HIGH and LOW, confirming the signal is active.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Digital Electronics and Microprocessors 3