1) The most common form of radio interference on aircraft radio systems is caused by: Report

Electrical noise.

Precipitation static.

Mutual radiation

2) Radio waves can be propagated by Report

Sky waves, sound waves and power waves.

Ground waves, longitudinal waves and transverse waves.

Ground waves, sky waves and space waves.

3) With reference to antenna length: Report

the higher the frequency, the shorter the antenna

the higher the frequency the longer the antenna.

the greater the power the longer the antenna.

4) For each frequency there is a particular length of conductor that will be resonant. This length is where: Report

the capacitive reactance is equal to the inductive reactance.

the capacitive reactance is equal to the resistance.

the inductive reactance is equal to the resistance.

5) Radio waves carry information (intelligence) by Report

producing ground waves.

modulation of the carrier wave.

producing space waves

6) Which of the following waves is used for long range radio communication? Report

Sky waves.

Space waves.

Ground waves.

7) The behavior of a radio wave when it leaves the antenna is called: Report

Modulation.

the speed of light

a speed that depends on the wavelength.

8) A radio wave consists of: Report

An electromagnetic wave only.

An electrostatic wave only

Both an electromagnetic wave and an electrostatic wave.

9) The Voltage Standing Wave Ratio (VSWR) of an antenna system is a measure of its Report

efficiency

peak power output

modulation amplitude

10) The ideal length for an antenna is: Report

Half the wavelength of the radio wave it is transmitting or receiving.

One eigth of the wavelength of the radio wave it is transmittng or receiving.

Equal to the wavelength of the radio wave it is transmitting or receiving..

11) The VSWR of a fixed radio antenna system will change with the transmitted wave's: Report

power.

modulation.

frequency.

12) Faulty coaxial cables or connectors fitted to aircraft radio antennae will Report

increase the VSWR and increase the transmitted power

increase the VSWR and decrease the transmitted power

decrease the VSWR and decrease the transmitted power

13) The area of metal surrounding the base of a 1/4 wave antenna is termed a Report

directional loop.

parabolic reflector

ground plane

14) An antenna that must be able to operate over a range of frequencies such as VOR is designed so that: Report

Antenna efficiency is optimised as far as possible over the frequency range required.

The antenna propagates ground waves over the frequencies covered.

The antenna VSWR is above 6 : 1 over the frequencies covered.

15) In a large transport aircraft which antennae are normally located with the weather radar scanner inside the radome? Report

Localiser and Glideslope antennae

Radio altimeter and VOR.

ATC and DME.

16) Static discharge wicks are located: Report

On the nose of the aircraft.

On the nose and fuselage of the aircraft.

At the trailing edges of the wing, horizontal and vertical stabilizers.

17) Antennas of radio systems transmitting on the same frequency bands should be located as far apart as possible.This is to reduce: Report

precipitation static

induced EMF interference.

mutual radiation interference

18) What is the function of a �TRANSFER� button on an aircraft VHF radio control head? Report

To transfer between SSB and DSB

To transfer between squelch and AGC mode

To transfer between the active and standby frequency

19) When troubleshooting, to check the sensitivity of the VHF installed system Report

Establish two way communication with the tower.

The BITE will give confirmation that the system is satisfactory

Use a test set which has a variable RF power output level

20) The primary voice communications system between an aircraft and air traffic control is the Report

VHF Communications system.

HF Communications system

satellite communications system

EASA Questions Module 13 Set 8

Set 1

Set 2

Set 3

Set 4

Set 5

Set 6

Set 7

Set 8

Set 9

Set 10

Set 11

Set 12