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WorksheetsCOM/NAV SYSTEMS — 50 QUESTION QUIZ
Total questions: 50
Worksheet time: 25mins
What is the speed of radio waves?
100,000 m/s
186,000 mi/s
50,000 km/h
300,000 km/h
Which type of modulation is most affected by static noise?
PM
FM
AM
PCM
What does FM stand for?
Frequency Match
Frequency Modulation
Fixed Modulation
Fast Messaging
What is the function of the transmitter?
To filter incoming signals
To decode audio
To generate and modulate RF signals
To amplify audio output
What law explains antenna reception?
Newton's Law
Bernoulli’s Principle
Lenz’s Law
Hooke’s Law
What frequency range does VOR operate in?
2–30 MHz
108–118 MHz
118–137 MHz
960–1215 MHz
What is the typical transmitter power in small aircraft?
10–15 W
1–2 W
3–5 W
30–40 W
What kind of energy does a microphone convert?
RF to DC
Electrical to light
ACOUSTIC TO ELECTRICAL
STATIC TO SOUND
Which modulation technique is used in Morse code?
FM
PM
AM
PCM
Which component receives and interprets radio signals?
Transmitter
Oscillator
Receiver
Antenna
What are LRUs in aircraft systems?
Long Range Units
Line Replaceable Units
Line Radio Utilities
Loop Resistance Units
Which component provides audio to the crew?
A) Antenna
B) Transmitter
C) Headset
D) Oscillator
What does an oscillator circuit do?
Convert voltage
Demodulate RF
Generate RF signals
Measure distance
What is the function of a demodulator?
Increase signal power
Translate intelligence from a carrier wave
Measure frequency
Transmit radio waves
What does “AM” stand for?
Alternating Memory
Amplitude Modulation
Audio Modulation
Amplitude Messaging
What does a DME system measure?
Distance
Speed
Direction
Altitude
What part of the antenna emits electromagnetic energy?
Ground plane
Shield
CONDUCTOR
MODULATOR
What is one main reason for using FM over AM?
A) Simpler circuits
B) Lower bandwidth
C) Less noise susceptibility
D) Longer range
Which frequency band is used for glideslope?
VHF
LF
HF
UHF (328–336 MHz)
What is the name of the alternating current frequency measurement?
Ohm
Decibel
Watt
Hertz
Which navigation system does not use radio waves?
A) VOR
B) ILS
C) INS
D) GPS
The voice signal in a transmitter is:
Compressed
Demodulated
Modulated
Amplified only
What is the function of a radio altimeter?
Display aircraft speed
Measure altitude above terrain
Navigate using satellites
Detect obstacles
The function of the antenna depends on:
Length only
Location only
Frequency, beam pattern, direction
Voltage only
What is the speed of light in miles per second?
100,000
186,000
200,000
1,000,000
Which frequency band does GPS operate in?
LF
HF
UHF
L-BAND (1.8 GHz)
A carbon microphone operates by:
Sound waves moving a diaphragm
Vibrating a carbon disk
Using piezoelectric crystals
Modulating a carrier
A glideslope uses which frequency range?
108–118 MHz
118–136 MHz
328–336 MHz
960–1215 MHz
What does the term “modulation” refer to?
Blocking signal noise
Changing the signal's power
Adding information to a carrier wave
Amplifying the antenna
What does RNAV stand for?
Required Navigation
Radar Navigation
Radio Navigation
Area Navigation
What does “line replaceable” mean in LRUs?
Must be fixed in-flight
Easily replaced without complex tools
Only for engine parts
For radio use only
What does DME stand for?
Direct Modulation Equipment
Distance Measuring Equipment
Direction Modulation Electronics
Digital Measuring Equipment
What allows VHF comm radios to have 720 channels?
Wide bandwidth
Pulse modulation
Crystal-controlled channels
Ground-based relays
What type of modulation allows AM radios to bounce off the ionosphere?
Pulse
FM
AM
PM
What device amplifies the audio signal in a receiver?
A) Antenna
B) Microphone
Audio Amplifier
Oscillator
The FCC regulates:
Pilot licensing
Communication frequency spectrum
Aircraft fuel usage
Weather services
A headset includes:
Only a microphone
Microphone and speaker
Transmitter
Only speaker
Where are LRUs typically located?
Passenger compartment
Wing tips
Avionics bay
Landing gear bay
What causes electromagnetic radiation from an antenna?
Ground plane voltage
Fluctuating AC current
Static electricity
Magnetic field only
What improves clarity of microphone transmission?
Louder speech
Whispering
Clear pronunciation, pacing
Fast speech
Which system works independently of external radio signals?
GPS
DME
ILS
Inertial Navigation System (INS)
What is the purpose of the amplifier circuit in a transmitter?
Block noise
Stabilize frequency
Increase RF output
Cool the unit
What kind of system is ILS?
Satellite
Ground-based landing aid
Autonomous
Radar
What kind of field is created by current in an antenna?
Electric only
Magnetic only
Both electric and magnetic
Autonomous
How many channels can modern VHF transmitters handle?
50
100
360
720
Which law explains electromagnetic induction in antennas?
Faraday’s Law
Coulomb’s Law
Lenz’s Law
Newton’s Second Law
What does a speaker in an aircraft communication system do?
Sends voice to ATC
Provides audio output
Measures RF signals
Modulates frequency
What is the function of bonding straps in avionics installation?
Grounding and static protection
RF signal tuning
Amplification
Demodulation
What is one visual inspection item for communication systems?
Software version
Signal frequency
Wiring condition
RF carrier type
What field fluctuates along with the electric field in radio wave generation?
Acoustic field
Magnetic field
Static field
None
