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Avionics Multiple Choice Questions | MCQs | Quiz

Avionics Interview Questions and Answers
Practice Avionics questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Head Up Displays
•   Helmet Mounted Displays
•   Head Down Displays
•   Control & Data Entry
•   Fly-By-Wire Technology - 1
•   Fly-By-Wire Technology - 2
•   FBW Control Laws
•   FBW Failure Survival
•   Digital Implementation
•   Fly-by-Light Flight Control
•   Height & Heading Controls
•   ILS Automatic Landing - 1
•   ILS Automatic Landing - 2
•   Flight Management - 1
•   Flight Management - 2
•   Data Bus Systems
•   UAV Avionics
•   Electronic Communication
•   Modulation & Multiplexing
•   Electromagnetic Spectrum
•   Attenuation & Decibels
•   Tuned Circuits
•   Filters
•   Fourier Theory
•   Amplitude Modulation
•   Frequency Domain
•   Single Sideband Modulation
•   Phase Modulation
•   FM Noise Effects
•   Data Digital Transmission
•   Parallel Transmission
•   Data Conversion - 1
•   Data Conversion - 2
•   Data Conversion - 3
•   Pulse Modulation
•   Digital Signal Processing
•   Radio Transmitters
•   Communication Receivers
•   ↓ Multiplexing ↓
•   Frequency Division
•   Time Division Multiplexing
•   Pulse Code Modulation
•   Transmission Line Basics-1
•   Transmission Line Basics-2
•   Transmission Line Basics-3
•   Standing Waves
•   Circuit Elements
•   Antenna Fundamentals
•   Antenna Types - 1
•   Antenna Types - 2
•   Satellite Orbits
•   Satellite Communication
•   Satellite Subsystems
•   Ground Stations
•   Satellite Applications
•   Guidance & Navigation
•   Flight Phases
•   Navigation Equations
•   Radio Propagation
•   Point Source Radio System
•   Hyperbolic Radio System-1
•   Hyperbolic Radio System-2
•   Orbital Mechanics
•   Satellite Signals
•   NAVSTAR GPS
•   Global Orbiting Navigational
•   Accelerometer
•   Gyroscopes - 1
•   Gyroscopes - 2
•   Strap Down Systems
•   Pressure Measurements
•   Side Slip Measurements
•   Air Data Equations
•   Air Data Computers
•   Hyper Sonic Air Data
•   Vertical References
•   Doppler Radar
•   Radar Altimeter
•   Stellar Inertial Navigation
•   Stellar Sensor Design
•   Landing Mechanics
•   ↓ Landing Systems ↓
•   Automatic Systems
•   Instrument Systems - 1
•   Instrument Systems - 2
•   Microwave Landing System
•   Satellite Landing System
•   Carrier Landing Systems
•   Air Traffic Control
•   Electronic Scanned Array
•   Primary & Secondary Radar
•   Modes S System
•   Collision Avoidance System

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Avionics Questions and Answers – Fly-by-Light Flight Control

Posted on July 4, 2018 by Manish

This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Fly-by-Light Flight Control”.

1. Which of the following affects the Fly-By-Wire system?
a) EMI
b) Lightning strikes
c) Flying in powerful Radio/Radar region
d) Bad weather
View Answer

Answer: d
Explanation: One of the common modes of failure in the Fly-By-Wire system is EMI. Since the whole aircraft runs on electricity, Electromagnetic Interference heavily affects the FBW system. It is caused by lightning strikes and in regions of high power radio or radar.
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2. What is EMP?
a) Electromagnetic pulse
b) Electromagnetic Power
c) Electromagnetic protection
d) Electrically Matched power line
View Answer

Answer: a
Explanation: An EMP, abbreviated as Electromagnetic pulse is a sudden change in the magnitude of an electrical field(a pulse) with strengths of hundreds of volts per meter. It occurs in a very wide range of electromagnetic radiation spectrum and can damage any electrical equipment in its vicinity.

3. What is EMC?
a) Electromagnetic capture
b) Electromagnetic compatibility
c) Electromagnetic combat
d) Electromagnetic course
View Answer

Answer: b
Explanation: EMC or Electromagnetic compatibility is the ability of the aircraft equipment to withstand high levels of EMI. This is a necessary condition as many cases have occurred of aircraft experiencing severe transients in the automatic flight control system placing the aircraft temporarily out of control whilst overflying high power radar/radio transmitters. This has been due to the susceptibility of the flight control system analogue electronics to EMI because of inadequate electro-magnetic screening.

4. What is nuclear hardness?
a) Ability to survive a nuclear explosion
b) Ability to survive in the vicinity of nuclear explosion
c) Ability to defend nuclear weapons
d) Ability to drop nuclear weapons with precision
View Answer

Answer: b
Explanation: Vicinity to a nuclear explosion and consequent emission of gamma radiation and an EMP of very high electric field strength. Military avionic equipment is specially designed to survive up to a certain (classified) level of these effects. This attribute is referred to as ‘nuclear hardness’ and is achieved by the design of the circuits, use of nuclear hard components, circumvention techniques and very efficient electromagnetic screening.

5. Where is an EMC vault used?
a) Housing of FBW computer
b) Housing of all electronics
c) Screened enclosure around the connector
d) Shield for wires
View Answer

Answer: c
Explanation: The wires from the cable connectors and the EM filters are housed within a screened enclosure around the connector known as an ‘EMC vault’ so that there is no aperture for EMI radiation to enter the box. The wires connecting different electrical equipment are the most affected by EMI.
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6. Fiber optic cables are used in aircraft only for faster data transmission.
a) True
b) False
View Answer

Answer: b
Explanation: In addition to high data rates in the optical transmission medium, another important advantage is its ability to survive EMI. Fiber optics have very less interference by EMI and are used in aircraft mainly for this reason.

7. Which one of the following is false with respect to fiber optic cables?
a) High speed
b) Heavy compared to normal wires
c) Less EM interference
d) Costly
View Answer

Answer: b
Explanation: Fiber optics weigh comparatively very low than normal wires. Wires require shielding from EMI which also adds up to the overall weight of the connectivity system. They also offer high speed data transfer and are relatively costly.

8. Optical fiber is an insulator.
a) True
b) False
View Answer

Answer: a
Explanation: Fiber optic cables carries a digitally modulated light intensity signal. IT has no necessity to be made of an conductor as the only condition for light to pass through is an opaque medium. Optical fibers are always made with an insulating material as they offer less EMI.

9. What type of multiplexing is used in optical fiber lines?
a) Time division multiplexing
b) Code division multiplexing
c) Frequency division multiplexing
d) wavelength division multiplexing
View Answer

Answer: d
Explanation: Fibre optic data transmission use ‘wavelength division’ multiplexing whereby a single fibre can be used to transmit several channels of information as coded light pulses of different wavelengths (or colours) simultaneously. The individual data channels are then recovered from the optically mixed data by passing the light signal through wavelength selective passive optical filters which are tuned to the respective wavelengths. WDM has a very high integrity as the multiplexed channels are effectively optically isolated.

10. Where was the first Fly-By-Light system used?
a) Fighter aircraft
b) Bomber Aircraft
c) Airships
d) Spacecrafts
View Answer

Answer: c
Explanation: Non-rigid airships may be acquiring a new lease of life as long duration platforms for airborne radar surveillance systems. The airship is able to carry a large high power radar antenna within its envelope and is able to remain airborne for several days. Since the antenna could severely interfere with FBW systems FBL system was used.
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Sanfoundry Global Education & Learning Series – Avionics.

To practice all areas of Avionics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Facebook | Twitter

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