Communication Principles
Communication Principles Quiz
Test your knowledge of communication principles with our engaging quiz! This quiz features 11 multiple-choice questions that cover various topics within electromagnetic waves, radio frequency, and signal encryption.
- Assess your understanding of radio wave propagation
- Explore EM wave properties and their applications
- Challenge yourself with technical terminologies and concepts
If the frequency of a radio wave is 150MHz what is the wavelength?
1m
10m
0.5m
1cm
The process of diffraction is?
The action of a wave when it appears to be re-radiated through a small aperture
The action of a wave when it changes velocity as it passes between materials
The action of a wave when it is dispersed by the surface of a material
The action of a wave when it is absorbed by a material causing thermal heating
What is the relationship between the elements of an EM wave?
Electric field and static field are 90 degrees to each other and direction of propagation
Electric field and magnetic field are at 180 degrees to each other and the direction of propagation
Magnetic field and flux field are 180 degrees to each other and the direction of propagation
Electric field and magnetic field are at 90 degrees to each other and the direction of propagation
What is the EM frequency band that has the wavelengths immediately longer and frequencies just below visible light?
Infra-red
Ultra Violet
Radio Waves
X Rays
What is the internationally agreed frequency band for VHF communications?
300KHz-3MHz
3-30MHz
30-300MHz
3-30GHz
What is the frequency band designation for the band between 8 and 10 GHz?
K Band
I Band
D Band
F Band
What radio wave propagation mode utilises diffraction to obtain long range communication?
Ground Wave
Sky Wave
Space Wave
Tropospheric Wave
Why are HF ground waves utilised by RN Helicopters rather than HF sky waves?
HF sky wave propagation is more reliable over the sea than ground waves for RN helicopters at the ranges required
HF ground wave propagation is more reliable than sky waves for the ranges requires
The rotors of a helicopter reflect the waves in all directions giving good coverage
The rotors of a helicopter prevent radio waves reaching the ionosphere
Why do short and medium radio wave reception frequencies and ranges change from day to night?
The light enables radio operators to have longer line of sight range
The sun spots are less active during the night causing less interference
The sun creates ionisation and ionospheric layers change between night and day
The ozone layer combines to form bigger molecules and more ionisation at night
Which of the following methods is used for encryption of a communication signal?
Analogue to digital conversion followed by exclusive OR (modulo 2 addition) with a pseudo random code
Exclusive OR (modulo 2 addition) with a pseudo random code followed by analogue to digital conversion
Pulse width modulation followed by amplitude shift keying
Pulse amplitude modulation followed by exclusive OR (modulo 2 addition)
What is the typical frequency range of the voice baseband in a military radio?
30-300Hz
300Hz-3kHz
30Hz-3kHz
300Hz-15kHz
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