AET Avionics Systems 3 — Questions and Answers
Question 1: What does the term 'EFIS' stand for in modern avionics?
- Electronic Flight Instrument System (Correct answer)
- Enhanced Flight Information Software
- Electronic Frequency Integration System
- Encoded Flight Indicator Standard
Correct answer: Electronic Flight Instrument System
EFIS stands for Electronic Flight Instrument System, replacing traditional electromechanical gauges with digital displays.
Question 2: Which bus architecture is commonly used in modern commercial aircraft for avionics data communication?
- RS-232
- ARINC 429 (Correct answer)
- CAN bus
- USB 3.0
Correct answer: ARINC 429
ARINC 429 is the standard data bus used in commercial aviation for unidirectional communication between avionics systems.
Question 3: What is the primary function of a Traffic Collision Avoidance System (TCAS)?
- Monitor ATC radar returns
- Provide terrain proximity warnings
- Issue resolution advisories to avoid mid-air collisions (Correct answer)
- Track cargo weight and balance
Correct answer: Issue resolution advisories to avoid mid-air collisions
TCAS interrogates transponders of nearby aircraft and issues resolution advisories (RAs) to pilots to prevent mid-air collisions.
Question 4: In an Inertial Reference System (IRS), what sensors are used to measure angular rate?
- Barometric sensors
- Ring laser gyroscopes or fiber optic gyroscopes (Correct answer)
- Magnetometers
- GPS receivers
Correct answer: Ring laser gyroscopes or fiber optic gyroscopes
Modern IRS units use ring laser gyroscopes (RLGs) or fiber optic gyroscopes (FOGs) to measure angular rate without moving parts.
Question 5: What frequency band does the ILS localizer transmit on?
- 75 MHz
- 108–112 MHz VHF (Correct answer)
- 329–335 MHz UHF
- 960–1215 MHz
Correct answer: 108–112 MHz VHF
The ILS localizer transmits between 108 and 112 MHz in the VHF band, providing lateral guidance to the runway centerline.
Question 6: Which avionics component converts analog sensor signals to digital format for processing by the flight management computer?
- Digital-to-Analog Converter (DAC)
- Analog-to-Digital Converter (ADC) (Correct answer)
- Signal Multiplexer
- Remote Data Concentrator (RDC)
Correct answer: Analog-to-Digital Converter (ADC)
An Analog-to-Digital Converter (ADC) translates analog sensor voltages into digital data that avionics computers can process.
Question 7: What does a Weather Radar system use to detect precipitation intensity?
- Infrared thermal signatures
- Reflected radio wave energy (return power) (Correct answer)
- Doppler frequency shift only
- Static charge accumulation
Correct answer: Reflected radio wave energy (return power)
Weather radar measures the power of reflected radio waves; heavier precipitation returns stronger signals, color-coded on the display.
AET Avionics Systems 3
What does the term 'EFIS' stand for in modern avionics?