AET Digital Electronics and Microprocessors 2

Question 1

An ADC (Analog-to-Digital Converter) performs which conversion in avionics systems?

Accepted Answer

Converts analog signals to digital signals

Answer

An ADC samples continuous analog sensor data and converts it to discrete digital values for processing by a microprocessor.

Question 2

The ARINC 429 data bus used in commercial aviation is best described as a:

Accepted Answer

Single-transmitter, multiple-receiver unidirectional bus

Answer

ARINC 429 uses a unidirectional architecture with one transmitter driving up to 20 receivers on a twisted-pair wire.

Question 3

What does CRC stand for in the context of digital data communications?

Accepted Answer

Cyclic Redundancy Check

Answer

CRC (Cyclic Redundancy Check) is an error-detection algorithm that generates a checksum to verify data integrity during transmission.

Question 4

How many discrete digital output values can a 12-bit ADC produce?

Accepted Answer

4,096

Answer

A 12-bit ADC can represent 2^12 = 4,096 discrete digital values, ranging from 0 to 4,095.

Question 5

PWM (Pulse Width Modulation) is used in avionics primarily to:

Accepted Answer

Control motors and actuators by varying the duty cycle

Answer

PWM controls the average power delivered to motors and actuators by varying the on-time (duty cycle) of a fixed-frequency digital pulse.

(AET) Aircraft Electronics Technician Practice Test