wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

M11.5 Cat A Communications

Total questions: 51

Worksheet time: 20mins

Name
Class
Date
1.

What functions does the audio selector panel provide?

a)

It connects the microphone to the selected communication system and all the selected audio signals to the headphones.

b)

Frequency tuning for HF- and VHF-communication systems.

c)

It amplifies the microphone signal for the passenger address system.

d)

It converts the analogue audio signals into Digital signals to the selected communication system

2.

Which priority sequence is used in a Passenger Address (PA) amplifier?

a)

1. cabin crew, 2. cockpit crew, 3. pre-recorded announcements, 4. boarding music

b)

The highest priority is the system that is first switched on.

c)

1. cockpit crew, 2. cabin crew, 3. pre-recorded announcements, 4. boarding music

d)

1. boarding music, 2. pre-recorded announcements, 3. cabin crew, 4. cockpit crew

3.

Why are three VHF systems installed?

a)

One for the captain, one for the first officer and one for the observer

b)

One to transmit, one to receive and one for spare

c)

Two systems are required for commercial airline operation and the third one is normally used by ACARS.

d)

One main system and 2 for redundancy

4.

What is the SATCOM system used for?

a)

For voice communication only

b)

For voice communication and data transfer between the ground and the aircraft

c)

For ACARS data transfer only

d)

For positional navigation downlink

5.

What is the primary purpose of radio communication?

a)

To detect nearby objects

b)

To exchange information using radio waves

c)

To stream video

d)

To listen to music

6.

What is the main function of a resonator in a radio?

a)

To amplify the radio signal

b)

To amplify a specific frequency while ignoring all others

c)

To filter specific audio frequencies

d)

To amplify the audio signal

7.

Which layer of the atmosphere is most crucial for long-distance point-to-point communications?

a)
Ionosphere
b)
Mesosphere
c)
Stratosphere
d)
Thermosphere
8.

What is the HF band radio transmission often referred to, and why are they suitable for long-distance communication?

a)

Ultrawave radio, because they have the highest frequency and speed

b)

Longwave radio, because they can penetrate through solid objects easily

c)

Shortwave radio, because they can be refracted back to Earth by the ionosphere layer in the atmosphere

d)

Microwave radio, because they are not absorbed by solid objects so travel further

9.

How do space waves travel to the receiving antenna?

a)

They diffract from high points on the surface or buildings.

b)

They travel along the contour of the Earth

c)

They are refracted back to the Earth by the ionosphere

d)

They travel through the air directly in 'line of sight' or can be reflected from the surface of the Earth

10.

Which type of surface has the best conductivity for surface wave propagation?

a)

Jungle

b)

Desert

c)

Sea water

d)

Rocky Terrain

11.

How is ionization in the ionosphere primarily formed?

a)

Through terrestrial radiation from the Earth's core

b)

Through cosmic rays from outer space

c)

Through high energy ultraviolet light waves from the sun striking gas atoms

d)

Through Moon rays striking molecules to create ions

12.

Which of these factors do NOT determine the amount of refraction a radio wave undergoes in the ionospheric layer?

a)

The density of the ionization layer

b)

The colour of the radio wave

c)

The frequency of the radio wave

d)

The angle of Incidence

13.
Which of the following is NOT primarily associated with the role of a transmitter in a basic radio communication system?
a)
Converting received electromagnetic energy into current variations
b)
Generating a basic radio frequency via an oscillator
c)
Amplifying the radio frequency signal
14.
What function does an antenna perform?
a)
Amplifies the signal before transmission
b)
Converts electrical power into electromagnetic waves and vice versa
c)
Converts electrical signals into sound waves
15.
What best describes a dipole antenna?
a)
An antenna with two identical conductive elements, such as rods or metal wires
b)
An antenna that uses a parabolic reflector
c)
An antenna that focuses on receiving signals only
16.
What does the radiation pattern of a basic dipole antenna depict?
a)
The structure and build of the antenna
b)
The power supply to the antenna
c)
How the antenna radiates energy out into space
17.
Which of the following describes the polarisation of a radio wave?
a)
The frequency of the radio wave
b)
The direction of the electrical field
c)
The amplitude of the radio wave
18.
Why are unipoles/rod antennas preferred for use on aircraft?
a)
They minimise drag and potential damage due to their shorter length
b)
They are twice the physical length of half-wave dipoles
c)
They have a unique radiation pattern that prevents interference
19.
What is the primary purpose of modulation in communication systems?
a)
To convert all signals into digital format
b)
To increase the frequency of a message source
c)
To encode information from a message source in a manner suitable for transmission
20.
Which signal is described as a high-frequency signal that contains no information and is used to carry the modulated signal to the receiver?
a)
Modulated Signal
b)
Carrier Signal
c)
Message Signal
21.
In which type of modulation is the phase of the high frequency carrier wave varied in accordance with the instantaneous value of the modulating signal?
a)
Phase Modulation
b)
Frequency Modulation
c)
Amplitude Modulation
22.
What aspect of the pulse is varied in Pulse Width Modulation (PWM)?
a)
Position of the pulse
b)
Width or duration of the pulse
c)
Amplitude of the pulse
23.
In Pulse Position Modulation, which attributes of the pulse remain constant?
a)
Position and amplitude
b)
Width and position
c)
Width and amplitude
24.
Which digital modulation technology is widely used in modern systems like Satcom or Mode-S Transponder
a)
Phase Shift Keying (PSK)
b)
Binary Phase Shift Keying (BPSK)
c)
Frequency Shift keying (FSK)
25.
Which component in an AM transmitter amplifies the low-level signal from the microphone?
a)
RF Oscillator
b)
AF power amplifier
c)
Modulated RF power amplifier
26.
What is the primary role of the oscillator in a transmitter?
a)
To generate the basic RF signal
b)
To amplify the modulated signal
c)
To convert audio signals to electrical signals
27.
Which microphone operates based on the principle of a change in capacitance when subjected to sound waves?
a)
Carbon Microphone
b)
Dynamic Microphone
c)
Capacitor Microphone
28.
What is the primary function of the Power Amplifier in an AM transmitter?
a)
To increase the magnitude of the RF current and voltage
b)
To convert sound waves into electrical signals
c)
To modulate the RF carrier with audio intelligence
29.
What does a microphone primarily convert?
a)
Sound waves into radio frequencies
b)
Sound waves into electrical signals
c)
Electrical signals into sound waves
30.
What function does the frequency synthesiser serve in a transceiver system?
a)
It operates as the transceiver's tuning system
b)
It amplifies the modulated RF signal
c)
It modulates the RF signal with audio intelligence
31.
What is the primary purpose of a receiver?
a)
Conversion of the electrical signal to radio waves
b)
Generation of electromagnetic waves from electrical voltages
c)
Reception of electromagnetic waves and their conversion to electrical voltages
32.
In the context of a receiver, what does 'Selectivity' refer to?
a)
The ability to select the required signal and to reject all others
b)
The ability to reproduce the original modulation without distortion
c)
The ability of the receiver to amplify the selected signal
33.
What is the primary function of the Audio Integrating System in an aircraft?
a)
It acts as an interface between the users and the various radio communication and navigation systems
b)
It acts as an interface between the users and the in-flight entertainment system.
c)
It enables the aircraft's loudspeaker system for onboard announcements
34.
Which of the following is NOT a function of the Audio Management Unit (AMU)?
a)
Radio transmission - Microphone Selection
b)
Visual and aural warnings of the ground crew and the Cabin Attendant calls
c)
Interface with the In-flight Entertainment System
35.
What is the primary use of the VHF System in an aircraft?
a)
It is the aircraft's principal air to air and air to ground voice and data communication system
b)
It is used for in-flight entertainment and broadcasting music to passengers
c)
It is used for the Instrument Landing System (ILS) Glideslope
36.
Regarding VHF antennas on passenger aircraft, why are blade types commonly used?
a)
They allow for better transmission over longer distances
b)
They are cheaper and easier to manufacture
c)
They provide mechanical strength, low drag, and broad bandwidth due to their enclosed design in weatherproof reinforced fiberglass
37.
Why is the HF Comms system essential for long-range flights?
a)
It allows for direct, line-of-sight communication without any obstructions
b)
When an aircraft is on a transoceanic flight, it loses VHF communications, and HF is used for long-range communication
c)
It provides superior audio quality compared to VHF systems
38.
Where on the aircraft would HF transceivers typically be installed?
a)
In the avionics bay
b)
In the empennage
c)
In the cockpit
39.
What does SELCAL eliminate the need for during long-range oceanic flights?
a)
The need for HF transmission
b)
The need for constant radio monitoring by the flight crew
c)
The need for a separate radio system
40.
How is the SELCAL system alerted when a ground station wants to communicate with a specific aircraft?
a)
By sending an encrypted call signal to all aircrafts
b)
By sending a unique four-letter SELCAL code assigned to the aircraft
c)
By transmitting a specific radio frequency unique to the aircraft
41.
Which organisation is responsible for providing satellites and ground support for Satcom?
a)
Inmarsat (International Maritime Satellites)
b)
SpaceX
c)

NASA (National Aeronautics and Space Administration)

d)

EU (European Union)

42.
Which system allows passengers to make calls, access email and the internet?
a)
SELCAL
b)
ACARS
c)
Satcom
43.
What was one of the main reasons for the introduction of ACARS in aviation?
a)
To increase the volume of voice communications
b)
To provide a backup for VHF communications
c)
To automate most company messages and reduce workload
44.
How does the ACARS Management Unit (MU) react when no acknowledgement is received after transmitting a link test?
a)
It retransmits several times and if still no acknowledgment, it retunes to another network frequency
b)
It sends a RECONNECT message immediately
c)
It waits indefinitely for an acknowledgment
45.
What is the primary function of the Flight Data Recorder (FDR)?
a)
To collect and record data from various aircraft sensors for accident analysis
b)
To broadcast the aircraft's location in real-time
c)
To alert air traffic control in case of emergencies
d)

To record all audio data during the flight

46.
What happens when the aircraft voltage drops to approximately 18V DC in relation to the Recorder Independent Power Supply (RIPS)?
a)
The RIPS shuts down to conserve energy
b)
The RIPS toggles to discharge its own internal battery to power the recorder equipment
c)
The RIPS charges its internal battery
d)

The RIPS provides 28V DC to the aircraft Battery Bus for up to 30 minutes

47.
What is the primary function of the Emergency Locator Transmitter (ELT)?
a)
To provide live streaming of flight data to ground stations
b)
To assist in locating the aircraft after a crash or emergency landing
c)
To provide a backup communication system for the flight crew
d)

To provide flight data to the Accident Investigation Branch

48.
Which frequency is utilised by the ELT to transmit a digitally encoded message that can be detected by the COSPAS-SARSAT satellite system?
a)
406.025 MHz
b)
121.5 MHz
c)
50 MHz
d)

243 MHz

49.

Which component is responsible for converting the pilot's voice into an electrical signal?

a)

The aircraft's receiver

b)

The aircraft's transmitter

c)

The pilot's headset microphone

d)

The audio selector panel

50.

Which type of antenna is typically used for satellite communication in aircraft?

a)

Yagi-Uda Antenna

b)

High Gain Antenna

c)

Whip Antenna

51.

Which component is responsible for extracting the modulated information from the carrier wave in a communication receiver?

a)

Amplifier

b)

Oscillator

c)

Demodulator

d)

Transmitter

e)

Filter

Similar Resources on Wayground

General awareness

50 questions

General awareness

quiz

Worksheet

•

Professional Development

PL M-03-05

50 questions

PL M-03-05

quiz

Worksheet

•

University - Professi...

Nutrioji Fest

50 questions

Nutrioji Fest

quiz

Worksheet

•

12th Grade - Professi...

HOA M-01 F-08 ANCIENT GREECE

50 questions

HOA M-01 F-08 ANCIENT GREECE

quiz

Worksheet

•

University - Professi...

ch 16 testbank

50 questions

ch 16 testbank

quiz

Worksheet

•

Professional Development

ML

48 questions

ML

quiz

Worksheet

•

Professional Development

Leg, Ankle, and Foot Practice Exam

55 questions

Leg, Ankle, and Foot Practice Exam

quiz

Worksheet

•

Professional Development

CRCST Practice Test #3

50 questions

CRCST Practice Test #3

quiz

Worksheet

•

Professional Development