ATPL Radio

Question 1

What is the speed of light in m/s?

Answer 1

3x10^8 m/s

Question 2

What is the speed of light in nm/s?

Answer 2

162 000 nm/s

Question 3

What is the amplitude of a wave?

Answer 3

Distance between the top of the waves and the zero value

Question 4

What units are used to measure the amplitude of a wave?

Answer 4

Different units may be used, therefore it’s necessary to check the units given in a particular diagram or exercises. e.g. volts, metres, centimetres, etc

Question 5

What is a cycle of variation?

Answer 5

A single wave. (Measure from the prior middle value to the next middle value. Often this “middle” value is 0 in a conventional diagram)

Question 6

What determines the time it takes to complete one cycle?

Answer 6

The signal’s frequency

Question 7

What unit is frequency measured in?

Answer 7

Hertz (Hz)

Question 8

What is 1Hz equal to?

Answer 8

One cycle per second

Question 9

To abbreviate large numbers, prefixes are used. What is Giga equal to?

Answer 9

x10^9 / 1 GigaHertz=1 billion Hertz

Question 10

To abbreviate large numbers, prefixes are used. What is Mega equal to?

Answer 10

x10^6 / 1MegaHertz = 1 Million Hertz

Question 11

To abbreviate large numbers, prefixes are used. What is Kilo equal to?

Answer 11

x10^3 / 1KiloHertz = 1 Thousand Hertz

Question 12

To abbreviate large numbers, prefixes are used. What is hecto equal to?

Answer 12

x10^2 / 1HectoHertz = 100 Hertz

Question 13

To abbreviate large numbers, prefixes are used. What is deca equal to?

Answer 13

x10^1 / 1Decahertz = 10Hertz

Question 14

To abbreviate very small numbers, prefixes are used. What is centi equal to?

Answer 14

x10^-2 / 1CentiHertz = 1/100 Hertz

Question 15

To abbreviate very small numbers, prefixes are used. What is deci equal to?

Answer 15

x10^-1 / 1 deciHertz = 1/10 Hertz

Question 16

To abbreviate very small numbers, prefixes are used. What is milli equal to?

Answer 16

x10^-3 / 1 millihertz = 1/thousand Hertz

Question 17

To abbreviate very small numbers, prefixes are used. What is micro equal to?

Answer 17

x10^-6 / 1 microhertz = 1/million Hertz

Question 18

To abbreviate very small numbers, prefixes are used. What is nano equal to?

Answer 18

x10^-9 / 1 nanohertz = 1/billion Hertz

Question 19

What does the duration of a cycle depend on?

Answer 19

The frequency

Question 20

Is the frequency higher, lower or the same when there are more cycles per second?

Answer 20

Higher

Question 21

Is wavelength proportional or inversely proportional to frequency?

Answer 21

Inversely proportional

Question 22

What happens to the wavelength as frequency decreases?

Answer 22

It increases

Question 23

What happens to wavelength as frequency increases?

Answer 23

It decreases

Question 24

What is the formula to find wavelength?

Answer 24

Wavelength = speed of light / frequency

Question 25

What is the formula to find frequency?

Answer 25

Frequency = speed of light / wavelength

Question 26

What is a frequency band?

Answer 26

A way to categorise the different frequencies found in the electromagnetic spectrum varying from microwaves to cosmic rays

Question 27

What does the carrier wave determine?

Answer 27

The frequency of a particular radio signal

Question 28

What's a useful mnemonic to remember the radio-frequency subdivisions?

Answer 28

VLMHVUSE // Very Low Minimina Has Victor Using Safety Equipment

Question 29

What's the frequency range for very low frequency and what's it used for?

Answer 29

3-30kHz - very long range navigation

Question 30

What's the frequency range for low frequency and what's it used for?

Answer 30

30-300kHz - NDB, LW/MW broadcasting sations, Loran-C, Decca

Question 31

What's the frequency range for medium frequency and what's it used for?

Answer 31

300-3000kHz - NDB and radio range broadcasting stations

Question 32

What's the frequency range for high frequency and what's it used for?

Answer 32

3-30MHz - HF radio telephony

Question 33

What's the frequency range for very high frequency and what's it used for?

Answer 33

30-300MHz - VHF radio telephony, VDF, VOR, ILS, marker beacon

Question 34

What's the frequency range for ultra high frequency and what's it used for?

Answer 34

300-3000MHz - ILS glide path, DME and surveillance radars

Question 35

What's the frequency range for super high frequency and what's it used for?

Answer 35

3-30GHz - PAR, surveillance radars, Doppler, airborne weather, radar and radio altimeter

Question 36

What's the frequency range for extremely high frequency and what's it used for?

Answer 36

30-300GHz - Aerodrome Surface movement radar & experimental radar

Question 37

What is the doppler effect?

Answer 37

A shift of frequency of an electromagnetic wave that happens when a transmitter and receiver move in relation to each other

Question 38

What happens if the transmitter and receiver are converging towards each other?

Answer 38

Frequency increases

Question 39

What happens to the frequency if the transmitter and receiver diverge from each other?

Answer 39

Frequency decreases

Question 40

What's the formula for Doppler shift?

Answer 40

Doppler (Hz) = relative velocity (m/s) / transmitted wavelength (m)