Digital Electronics and Microprocessors 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.
Read the first 7 Digital Electronics and Microprocessors flashcards as text
An ADC (Analog-to-Digital Converter) performs which conversion in avionics systems?
Answer: Converts analog signals to digital signals
An ADC samples continuous analog sensor data and converts it to discrete digital values for processing by a microprocessor.
The ARINC 429 data bus used in commercial aviation is best described as a:
Answer: Single-transmitter, multiple-receiver unidirectional bus
ARINC 429 uses a unidirectional architecture with one transmitter driving up to 20 receivers on a twisted-pair wire.
What does CRC stand for in the context of digital data communications?
Answer: Cyclic Redundancy Check
CRC (Cyclic Redundancy Check) is an error-detection algorithm that generates a checksum to verify data integrity during transmission.
How many discrete digital output values can a 12-bit ADC produce?
Answer: 4,096
A 12-bit ADC can represent 2^12 = 4,096 discrete digital values, ranging from 0 to 4,095.
PWM (Pulse Width Modulation) is used in avionics primarily to:
Answer: Control motors and actuators by varying the duty cycle
PWM controls the average power delivered to motors and actuators by varying the on-time (duty cycle) of a fixed-frequency digital pulse.
Which type of data transmission sends bits one at a time sequentially over a single channel?
Answer: Serial transmission
Serial transmission sends data bit-by-bit over a single wire, as used in avionics buses like ARINC 429 and RS-232.
What is the output of an XOR gate when both of its inputs are logic HIGH?
Answer: LOW
An XOR (Exclusive OR) gate outputs LOW when both inputs are the same state (both HIGH or both LOW).