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Radio Navigation

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Quiz on Radio Navigation, created by Jesús Nieto Domínguez on 27/11/2017.
Jesús Nieto Domínguez
Quiz by Jesús Nieto Domínguez, updated more than 1 year ago
Jesús Nieto Domínguez
Created by Jesús Nieto Domínguez about 7 years ago
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Resource summary

Question 1

Question
Wavelength is the distance from:
Answer
  • wave crest to the next trough.
  • wave crest to wave crest.
  • trough to the next wave crest.
  • the E to the H field superimposed onto the system reactance background scatter.

Question 2

Question
The emission characteristics A3E describe:
Answer
  • ILS.
  • VHF communications.
  • HF communications.
  • VOR.

Question 3

Question
Electromagnetic waves travel at:
Answer
  • 300 000 metres per second.
  • the speed of sound.
  • the speed of light.
  • 162 000 miles per hour.

Question 4

Question
In radio terms, frequency means:
Answer
  • the speed of radio waves in metres per second.
  • the length of a complete waveform in metres.
  • the number of complete waveforms passing a spot in one second.
  • the number of waveforms in one hour.

Question 5

Question
According to ICAO Annex 10, in which frequency band(s) does a locator normally transmit?
Answer
  • HFI/VHF
  • MF/HF
  • HF
  • LF/MF

Question 6

Question
The Automatic Direction Finder uses the following wavelengths:
Answer
  • decimetric.
  • metric.
  • hectometric or kilo metric.
  • centimetric.

Question 7

Question
The Microwave Landing System (MLS) uses the following wavelengths:
Answer
  • myriametric
  • metric
  • hectometric
  • centimetric

Question 8

Question
Into what range does the ILS wavelength fall?
Answer
  • Kilometric
  • Metric
  • Nanometric
  • Millimetric

Question 9

Question
What is the frequency band for ADF?
Answer
  • Hectometric
  • Metric
  • Centimetric
  • Decimetric

Question 10

Question
A transmission of RF energy at a wavelength of 18 metres is in which frequency band?
Answer
  • MF
  • LF
  • HF
  • VHF

Question 11

Question
The Instrument Landing System (ILS) uses the following wavelengths:
Answer
  • metric
  • hectometric
  • decimetric
  • centimetric

Question 12

Question
The VHF direction finder uses the following wavelengths:
Answer
  • decimetric
  • hectometric
  • metric
  • centimetric

Question 13

Question
The Distance Measuring Equipment (DME) uses the following wavelengths:
Answer
  • decimetric
  • hectometric
  • metric
  • centimetric

Question 14

Question
The VHF omnirange (VOR) uses the following wavelengths:
Answer
  • centimetric
  • hectometric
  • decimetric
  • metric

Question 15

Question
What is the wavelength of an ILS signal?
Answer
  • Centimetric
  • Hectometric
  • Metric
  • Decimetric

Question 16

Question
A radio facility transmits on a wavelength of 2,22 cm. The facility could be a ___ operating on a frequency of __ •
Answer
  • VDF; 135 MHz
  • DME; 1350 MHz
  • doppler; 13500 MHz
  • radio altimeter; 13500 kHz

Question 17

Question
Frequency is defined as the:
Answer
  • number of complete cycles recurring in one unit of time.
  • distance between a crest and a crest.
  • number of complete cycles recurring in ten units of time.
  • distance from the axis to the peak value.

Question 18

Question
What is the wavelength of a VOR?
Answer
  • Metric
  • Decimetric
  • Heximetric
  • Centimetric

Question 19

Question
A radio transmitter modulator:
Answer
  • superimposes an audio frequency signal (AF) onto a radio frequency signal (RF).
  • couples the RF signal to an aerial.
  • tunesthe'aeria I-onl
  • ensures receiver compatibility.

Question 20

Question
The Marker beacons use the following wavelengths:
Answer
  • metric
  • centimetric
  • hectometric
  • myriametric

Question 21

Question
The secondary Surveillance Radar (SSR) uses the following wavelengths:
Answer
  • myriametric
  • centimetric
  • hectometric
  • decimetric

Question 22

Question
The Low Altitude Radio Altimeter uses the following wavelengths:
Answer
  • myriametric
  • centimetric
  • decimetric
  • metric

Question 23

Question
Selcal is an equipment that:
Answer
  • is coupled with TeAS II and is to do with TA warning systems.
  • automatically transmits data signals
  • automatically receives incoming signals.
  • functions as a frequency modulator.

Question 24

Question
What is the wavelength corresponding to a frequency of 375 kHz:
Answer
  • 8m
  • 80m
  • 800m
  • 8000m

Question 25

Question
The wavelength of a radio signal transmitted at the frequency of75 MHz is:
Answer
  • 4m
  • 40m
  • 7,5 m
  • 75m

Question 26

Question
A wavelength of 8,5 m~ corresponds to a frequency of:
Answer
  • 2 833,3 MHz
  • 35294MHz
  • 3529,4MHz
  • 28333 MHz

Question 27

Question
The VHF frequency band is in the:
Answer
  • 3 to 30 kHz range.
  • 30 to 300 kHz range.
  • 3 to 30 MHz range.
  • 30 to 300 MHz range.

Question 28

Question
Assuming a wavelength of 1 cm, frequency will be:
Answer
  • 30MHz
  • 30GHz
  • 3,OGHz
  • 0,3 GHz

Question 29

Question
The limits of the VHF band are:
Answer
  • 300 - 3000 MHz.
  • 30 - 300 MHz.
  • 300 - 3000 kHz.
  • 3-30 MHz.

Question 30

Question
Decimetric waves correspond to the frequency range:
Answer
  • 3 000 to 30 000 MHz.
  • 3 000 to 30 000 kHz.
  • 300 to 3 000 MHz.
  • 300 to 3 000 kHz.

Question 31

Question
The wavelength of a radio signal transmitted at the frequency 118,7 MHz is:
Answer
  • 2,53 m
  • 25,3 m
  • 2,53 cm
  • 25,3 cm

Question 32

Question
The wavelength of a radio signal with a frequency of 121.95 MHz is:
Answer
  • 24,60m
  • 24,60 cm
  • 2,46 cm
  • 2,46 m

Question 33

Question
The frequency which corresponds to a wavelength of 12 cm is:
Answer
  • 2500 kHz
  • 2500 MHz
  • 360MHz
  • 3600 MHz

Question 34

Question
A half wave dipole aerial suitable for transmitting an RF signal at 18 MHz should have an effective length of:
Answer
  • 16,67 metres.
  • 166,67 metres.
  • 83,33 metres.
  • 8,33 metres.

Question 35

Question
Assuming a frequency of 20 MHz, wavelength will be:
Answer
  • 1,5 m
  • 15m
  • 150m
  • 0,15 m

Question 36

Question
What is the wavelength of an NOB transmitting on 375 kHz?
Answer
  • 1,25 m
  • 12,5 m
  • 800m
  • 80m

Question 37

Question
A frequency of 2.400 kHz is equivalent to a wavelength of:
Answer
  • 125 m
  • 105 m
  • 0,80em
  • 8m

Question 38

Question
The wavelength of a non-directional beacon (NOB) at a frequency of 300 kHz is:
Answer
  • 1000 metres
  • 100 metres
  • 10 metres
  • 1 metre

Question 39

Question
The wavelength of a radio signal is 200 metres. What is its frequency?
Answer
  • 1,5 kHz
  • 1,5GHz
  • 1,5MHz
  • 15 MHz

Question 40

Question
A radio signal has a frequency of 3 GHz. Its wave length is:
Answer
  • 100 cm
  • 1,O cm
  • 10 cm
  • 1,O m

Question 41

Question
The VHF frequency band has a wavelength limit of:
Answer
  • 100 m to 10m.
  • 1 m to 100c m.
  • 10 m to 1 m.
  • 100 cm to 10 em.

Question 42

Question
The gain of an aerial is a measure of its ability to:
Answer
  • focus power.
  • transmit intelligence.
  • overcome transmitter line resistance.
  • compensate for attenuation.

Question 43

Question
Which of the following statements is correct in respect of a RF signal:
Answer
  • the plane of polarisation is dictated by the oscillator unit in the transmitter.
  • the electrical component of the signal is parallel to the aerial.
  • the magnetic component of the signal is parallel to the aerial.
  • both the electrical and magnetic components are parra lei to the aerial.

Question 44

Question
A radio wave with a horizontal magnetic component would be best received by a ___ aerial.
Answer
  • magnetic
  • parabolic
  • horizontal
  • vertical

Question 45

Question
A horizontally polarized electromagnetic wave:
Answer
  • has the H field horizontal.
  • has the Z field horizontal.
  • has the E field vertical.
  • has the E field horizontal.

Question 46

Question
Feeder lines are of the following types:
Answer
  • Co-axial- up to 3000 MHz; wave guides - above 3000 MHz
  • Co-axial- above 3000 MHz; wave guides - up to 3000 MHz
  • Co-axial- up to 300 kHz; wave guides - above 300 kHz
  • Wave guides - up to 20 MHz; co-axial above 30 MHz

Question 47

Question
An electromagnetic wave has two types of energy field:
Answer
  • an H electrical field and an E magnetic field.
  • a Z electrical field and an H magnetic field.
  • an E electrical field and an H magnetic field.
  • an Z magnetic field and an E electrical field.

Question 48

Question
Comparing a parabolic reflector with a flat plate antenna of the same size
Answer
  • the parabolic reflector has a considerably smaller beam width.
  • the parabolic reflector generates less side lobes than the flat plate antenna.
  • the flat plate antenna generates less side lobes than the parabolic reflector.
  • the flat plate antenna has a considerably smaller beam width.

Question 49

Question
What causes the so-called night effect?
Answer
  • A change in the direction of the plane of polarisation due to reflection in the ionosphere.
  • The absence of the surface wave at distances larger than the skip distance.
  • Interference between the ground and the space wave.
  • The difference in velocity of the EM-waves over land and over sea, at night.

Question 50

Question
A Doppler shift will occur:
Answer
  • if a transmitter is moving during transmission to a fixed position receiver.
  • when the distance between a transmitter and a receiver is changing during a transmission.
  • if a receiver is moving during reception of transmission from a fixed position transmitter.
  • all answers are correct.

Question 51

Question
When a transmitter is moving towards a receiver, the correct description of Doppler effect is:
Answer
  • there is a decrease in apparent wavelength which is dependent on the transmitter velocity.
  • there is a decrease in apparent wavelength which is independent of the transmitter velocity.
  • there is a increase in apparent wavelength which is dependent on the transmitter velocity.
  • there is a increase in apparent wavelength which is independent of the transmitter velocity.

Question 52

Question
An apparent increase in the transmitted frequency which is proportional to the transmitter velocity will occur when:
Answer
  • the transmitter moves away from the receiver.
  • the transmitter moves towards the receiver.
  • the receiver moves towards the transmitter.
  • both transmitter and receiver move towards each other.

Question 53

Question
Due to Doppler effect an apparent decrease in the transmitted frequency, which is proportional to the transmitters velocity, will occur when:
Answer
  • the transmitter and receiver move towards each other.
  • the transmitter moves away from the receiver.
  • the transmitter moves toward the reciever.
  • both transmitter and receiver move away from each other.

Question 54

Question
Refraction of an electro-magnetic radiation is:
Answer
  • the bending of its propagation path as it passes through or over areas of different electrical conductivity.
  • the loss of power as it passes through or over areas of different electrical conductivity.
  • bending resultant from reflection from objects.
  • loss of power through reflection from objects.

Question 55

Question
Which statement is true?
Answer
  • The attenuation of an HF ground wave is worse over the land than over ice.
  • The ionosphere will attenuate and refract signals up to 30 GHz.
  • The lower the frequency the greater the ionospheric attenuation.
  • None of the above.

Question 56

Question
The term Doppler shift refers to:
Answer
  • the change in depression angle measured at the receiver.
  • the change in the speed measured at the receiver.
  • the change in phase angle measured at the receiver.
  • the change in frequency measured at the receiver.

Question 57

Question
Attenuation of radio waves means:
Answer
  • the weakening of the radiated waves.
  • the atmospheric bending of the waves.
  • only the scattering of the waves by the tropopause.
  • only the absorption of radio energy by the sea.

Question 58

Question
When an LF radio wave passes over the earth's surface it:
Answer
  • speeds up, picks up electrons and becomes stronger.
  • slows down and is attenuated.
  • speeds up and is attenuated.
  • slows down, picks up electrons and becomes stronger.

Question 59

Question
To establish and maintain effective HF communications the frequency used at a given range:
Answer
  • should remain constant.
  • should be increased at night.
  • should be decreased at night.
  • should only be varied by season, decreased in summer and increased in winter.

Question 60

Question
Skip distance is the:
Answer
  • highest critical frequency distance.
  • range from the transmitter to the first sky wave.
  • wavelength distance of a certain frequency.
  • thickness of the ionosphere.

Question 61

Question
Diffraction of a RF signal is a displacement of its propagation path dueto:
Answer
  • reflection from the surface.
  • passing over or though mediums of different conductivity.
  • passing over obstacles with dimensions close to the wavelength.
  • passing through ionised regions of the upper atmosphere.

Question 62

Question
Using a medium frequency band when is fading likely to occur?
Answer
  • Day time and snowing.
  • Night time and snowing.
  • Day with sky and ground waves.
  • Night with sky and ground waves.

Question 63

Question
Complete the following statement: ___ radio signals have a __ range by ___ wave over __ than over __ •
Answer
  • MF; shorter; sky; sea; land
  • MF; greater; groLind; sea; land
  • VHF; shorter; sky; sea; land
  • MF; greater; ground; land; sea

Question 64

Question
The frequency at which sky waves should least affect reception?
Answer
  • HF
  • MF
  • LF
  • VLF

Question 65

Question
The skip distance of HF-transmission will increase with:
Answer
  • higher frequency and higher position of the reflecting ionospheric layer.
  • lower frequency and higher position of the reflecting ionospheric layer.
  • higher frequency and lower position of the reflecting ionospheric layer.
  • lower frequency and lower position of the reflecting ionospheric layer.

Question 66

Question
Attenuation is a generic term for:
Answer
  • increase in power.
  • loss of power.
  • refraction.
  • loss of power but is only relevant to space waves.

Question 67

Question
Reflection from ionospheric layers is used in the following radio frequencies:
Answer
  • VHF
  • HF
  • UHF
  • VLF

Question 68

Question
MF fading is most common:
Answer
  • during the day due to the reception of both sky waves and ground waves.
  • during the day and during heavy rain.
  • at night and during heavy rain.
  • at night due to the reception of both sky waves and ground waves.

Question 69

Question
As the frequency of a transmitter is increased, the range of the ground wave will:
Answer
  • increase.
  • decrease.
  • decrease only at night.
  • increase only over the sea.

Question 70

Question
Skip distance is longest by __ and with a __ frequency.
Answer
  • day;low
  • day; high
  • -night; low
  • night; high

Question 71

Question
Attenuation of a radio wave is the:
Answer
  • increase of its power by the combination of mUlti-path signals.
  • change of its frequency QY use of sidebands.
  • change of its amplitude by use of sidebands.
  • reduction of its power by absorption, scattering or spreading.

Question 72

Question
A radio signal looses strength as the range from the transmitter increases. This effect is called:
Answer
  • refraction
  • attenuation
  • amplification
  • ducting

Question 73

Question
In the propagation of MF waves, the phenomenon of FADING is particularly found:
Answer
  • by day, due to the combination of sky and ground waves.
  • at night due to the combination of the sky and ground waves.
  • at night and when raining.
  • by day and when raining.

Question 74

Question
Fading happens:
Answer
  • in daytime when ground-waves and sky-waves interfere with each other.
  • at night when the signal is received by ground-waves only.
  • at daytime when the signal is received by sky-waves only.
  • at night when ground-waves and sky-waves interfere with each other.

Question 75

Question
Which of the following statements is true?
Answer
  • A broad bandwidth gives a narrow beam width.
  • A narrow bandwidth improves beam width.
  • A transmissions bandwidth is affected by the design of the aerial.
  • Bandwidth must be reduced in order to reduce noise.

Question 76

Question
Diffraction is the process by which:
Answer
  • a space wave penetrates the ionosphere.
  • a ground wave is attenuated over rough ground
  • radio wave travel over and around obstacles.
  • a direct wave is bent around the form of the Earth.

Question 77

Question
An HF transmitter is tuned to a frequency that refracts from the E layer in the Ionosphere. The maximum distance of the first returning skywave is:
Answer
  • 599 NM
  • 599 km
  • 1500 NM
  • 1500 km

Question 78

Question
What is the lowest frequency where freedom from static interference can be guaranteed?
Answer
  • 3MHz
  • 30MHz
  • 300MHz
  • 3 GHz

Question 79

Question
An aircraft travelling at 330 metres a second transmits a signal at 10 GHz to a stationary receiver. If the aircraft is flying directly towards the receiver and they are approximately at the same height the received frequency will be:
Answer
  • 11 MHz
  • 10,000011 GHz
  • 9,999989 GHz
  • 11 GHz

Question 80

Question
The approximate ground waves of LF and MF are (by day) __ and __ respectively, with __ suffering more from atmospheric attenuation.
Answer
  • 1500 NM; 1000 NM; MF
  • 1000 NM; 500 NM; LF
  • 1000 NM; 300 NM; MF
  • 500 NM; 100 NM; LF

Question 81

Question
The VDF class B bearing is accurate to within:
Answer
  • ± 1°
  • ±2°
  • ±3°
  • ±5°

Question 82

Question
When would VDF be used for a position fix:
Answer
  • when an aircraft declares an emergency on any frequency.
  • when first talking to a FIR on crossing an international boundary.
  • when joining controlled airspace from uncontrolled airspace.
  • when declaring an emergency on 121,5 MHz.

Question 83

Question
In which one of the following circumstances is ground direction finding (VDF) likely to be used to fix an aircraft's position?
Answer
  • When contacting ATe to join controlled airspace from the open FIR.
  • When declaring an emergency on any frequency.
  • When using the emergency VHF frequency 121,5 MHz.
  • On first contact with ATC on crossing an international FIR boundary.

Question 84

Question
What airborne equipment, if any, is required to be fitted in order that a VDF let-down may be flown?
Answer
  • None.
  • VOR.
  • VHF radio.
  • VOR/DME.

Question 85

Question
What equipment does an aircraft need when carrying out a VDF letdown:
Answer
  • VHF radio.
  • VOR.
  • VOR/DME.
  • none.

Question 86

Question
The minimum airborne equipment required for operation of a VHF direction finder is a:
Answer
  • VHF compass operating in the 200 kHz to 1.750 kHz range.
  • VHF transmitter-receiver operating in the 118 MHz to 136 MHz range.
  • VHF receiver operating in the 118 MHz to 136 MHz range.
  • cathode-ray tube.

Question 87

Question
Ground direction finding at aerodromes utilises which frequencies?
Answer
  • VHF at civil aerodromes and VHF at military aerodromes.
  • UHF at civil aerodromes and UHF at military aerodromes.
  • VHF at civil aerodromes and UHF at military aerodromes.
  • UHF at civil aerodromes and VHF at military aerodromes.

Question 88

Question
The range at which you can obtain a VDF bearing can be influenced by:
Answer
  • time of day.
  • type of surface.
  • height of aircraft.
  • intensity of ionisation.

Question 89

Question
An aircraft wishing to use the VDF service must:
Answer
  • be equipped with a VOR indicator unit.
  • transmit a signal for a long enough period for the bearing to be established.
  • ask the controller to transmit for a long enough period to establish the bearing
  • be within 10 NM of the VDF aerial.

Question 90

Question
What is the role of a ground direction finder?
Answer
  • To aid pilot navigation .
  • To aid ground movements.
  • To map airfields.
  • To assist planners in the construction of airfield approaches .

Question 91

Question
If, when you are requesting a QDM from an airfield, you are offered a QGH, it means:
Answer
  • the bearing will only be accurate when the aircraft is flying above the QGH level.
  • the VDF service will be handled by a different VDF unit, operating on the same frequency.
  • the VDF unit is prepared to give you assistance during an approach to the airfield, based on VDF bearings.
  • the service will be limited to bearings, no positions will be given by the DF station.

Question 92

Question
In VDF service the report "QDR235, Class C" means:
Answer
  • the magnetic bearing from the aircraft to the station is 235°±10°.
  • the true bearing from the aircraft to the station is 235°±1 0°.
  • the magnetic bearing from the station to the aircraft is 235 ±15°.
  • the magnetic bearing from the station to the aircraft is 235°±10°.

Question 93

Question
When conducting a QGH approach responsibility for interpreting the procedure rests with __ and on a QDM approach responsibility rests with ___ •
Answer
  • the controller; the controller
  • the pilot; the pilot
  • the pilot; the controller
  • the controller; the pilot

Question 94

Question
Which of the following affects VDF range?
Answer
  • Coastal refraction.
  • The height of the transmitter and of the receiver.
  • Sky wave propagation.
  • Strength of the pilot's voice when transmitting.

Question 95

Question
Abnormal long ranges may be experienced on VDF channels, caused by:
Answer
  • efficient VDF antennas.
  • super refraction of signals in the atmosphere.
  • the VDF station using a relay station for communication to the aircraft.
  • intermodulation with signals on frequencies close to the one used by the VDF station.

Question 96

Question
You intercept a QDM with a right crosswind component. Is your intercept heading greater or smaller then without wind influence?
Answer
  • Greater.
  • Smaller.
  • Remains the same.
  • Not enough information to give an answer.

Question 97

Question
If a ground DfF controller passes a bearing thus: "your true bearing is 256°, class alpha." This means:
Answer
  • QTE accurate to ± 5°.
  • QUJ accurate to ± 3°.
  • QOR accurate to ± 2°.
  • QTE accurate to ± 2°.

Question 98

Question
With reference to a VDF bearing, the true bearing of the aircraft from the ground station is a:
Answer
  • QTE
  • QUJ
  • QOR
  • QOM

Question 99

Question
Which Q code would give a magnetic bearing from a VDF station:
Answer
  • QOM
  • QOR
  • QUJ
  • QTE

Question 100

Question
Which Q code would give a magnetic heading to steer (nil wind) to a VDF station:
Answer
  • QDM
  • QDR
  • QUJ
  • QTE

Question 101

Question
Which Q code would give a true track from a VDF station:
Answer
  • QOM
  • QOR
  • QUJ
  • QTE

Question 102

Question
A VDF bearing can be obtained:
Answer
  • only on a frequency of 121,5 MHz.
  • on the Approach frequency
  • on the frequency notified for VOF services.
  • on the frequency agreed between the pilot and ATC but chosen from one of the available ATC frequencies.

Question 103

Question
An aeroplane requesting a VDF bearing should:
Answer
  • avoid banking during transmission.
  • not pass overhead VOF aerial.
  • ensure that radio silence is maintained.
  • transmit on 121,5 MHz.

Question 104

Question
Which of the following is an advantage of VDF?
Answer
  • No equipment required in the aircraft.
  • No special equipment required in the aircraft or onthe ground.
  • Only a VHF radio is needed in the aircraft.
  • It is pilot interpreted, so ATC is not required.

Question 105

Question
WhatisQTE?
Answer
  • Magnetic track from the station.
  • Magnetic track to the station.
  • True track from station.
  • True track to the station.

Question 106

Question
Which of the following is an advantage of GroundlDF (VDF) let-down?
Answer
  • It is pilot interpreted and does not require the assistance ofATC.
  • It only requires a VHF radio to be fitted to the aircraft.
  • It does not require any special equipment to be fitted to the aircraft.
  • It does not require any special equipment, apart from a VHF radio, to be installed in the aircraft or on the ground.

Question 107

Question
Which of the following statements regarding VHF direction finding (VDF) is most accurate?
Answer
  • It is simple and only requires a VHF radio on the ground.
  • It is simple and requires a VHF radio and OF equipment in the aircraft.
  • It is simple requiring only VHF radios on the ground and in the aircraft.
  • It uses line of sight propagation.

Question 108

Question
In the VDF system directional antennas are used:
Answer
  • in the aircraft.
  • in the aircraft and at the ground installation.
  • at the ground installation.
  • no directional antennas are used.
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