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Communication Principles

A detailed infographic illustrating various electromagnetic waves and their properties, including radio waves, frequency bands, and signal encryption methods, in a modern and visually appealing style.

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

11 Questions3 MinutesCreated by MeasuringWave742

If the frequency of a radio wave is 150MHz what is the wavelength?

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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