Which communication type is used for long-range communications?
A) HF (High Frequency) and satellite communication
B) VHF (Very High Frequency)
C) UHF (Ultra High Frequency)
A) HF (High Frequency) and satellite communication
Which communication type is used for short-range, line-of-sight communication?
A) VHF (Very High Frequency)
B) HF (High Frequency)
C) Satellite communication
A) VHF (Very High Frequency)
Navigation systems include:
Automatic Direction‑Finding (ADF)
VHF Omni‑directional Radio (VOR)
Distance Measuring Equipment (DME)
Area Navigation (RNAV)
Global Positioning System (GPS)
Remember what they stand for
What does one cycle of a wave represent?
A) The distance the wave travels in one second
B) One complete series of values
C) The maximum displacement from zero
B) One complete series of values
Radio waves are said to be polarised in the plane of the electric (E) field. If the E-field is vertical, how is the signal polarised?
A) Horizontally polarised
B) Vertically polarised
C) Circularly polarised
B) Vertically polarised
What happens to the wavelength as frequency increases?
A) Wavelength increases
B) Wavelength decreases
C) Wavelength remains the same
B) Wavelength decreases
How long can radio waves be between peaks?
A) As much as hundreds of metres
B) A few millimetres
C) A few centimetres
A) As much as hundreds of metres
Which of the following correctly describes parts of a radio wave?
A) A cycle is one complete series of values, amplitude is the maximum displacement from zero, and wavelength is the distance the wave travels in one cycle
B) A cycle is the maximum displacement, amplitude is the distance traveled, and wavelength is the number of cycles per second
C) A cycle is the number of waves per second, amplitude is the distance traveled, and wavelength is the height of the wave
A) A cycle is one complete series of values, amplitude is the maximum displacement from zero, and wavelength is the distance the wave travels in one cycle
What is the frequency range of the VHF Communication System used for line of sight communications?
A) 2 MHz to 29.999 MHz
B) 30 kHz to 300 kHz
C) 118.000 MHz to 136.975 MHz
C) 118.000 MHz to 136.975 MHz
What does selectivity refer to in communication systems?
A) The ability to amplify weak signals
B) The ability to select the required signal and to reject all others
C) The ability to transmit signals over long distances
B) The ability to select the required signal and to reject all others
What does sensitivity refer to in a receiver system?
A) The ability to reduce interference from other signals
B) The ability to amplify the selected signal to a useable level over the useable frequency range
C) The ability to transmit signals with high power
B) The ability to amplify the selected signal to a useable level over the useable frequency range
What does a high signal to noise ratio in a receiver indicate?
A) The receiver is generating high internal noise
B) The desired signal is clearly distinguishable from noise
C) The receiver cannot amplify weak signals
B) The desired signal is clearly distinguishable from noise
What is a characteristic of a Tuned Radio Frequency (TRF) receiver?
A) It converts the received frequency before detection
B) It does not change the radiated frequency between the antenna and the detector
C) It amplifies only audio frequencies
B) It does not change the radiated frequency between the antenna and the detector
Interference is categorised as which of the following?
A) Electrical and Mechanical
B) Naturally occurring and Man made
C) Static and Dynamic
B) Naturally occurring and Man made
The audio integrating system cannot be used to control which system?
A) Communication system
B) In-flight entertainment (IFE) system
C) Navigation system
B) In-flight entertainment (IFE) system
Priority 1 announcements come from which source?
A) Flight deck via PA handmic or ASP/ACP
B) Cabin crew via interphone
C) Passenger seat speakers
A) Flight deck via PA handmic or ASP/ACP
Priority 2 announcements come from which source?
A) Flight deck via PA handmic
B) Passenger cabin handmic or cabin interphone handset
C) Ground control communications
B) Passenger cabin handmic or cabin interphone handset
Which of the following corresponds to Priority 3 announcements?
A) Live announcement from the flight deck
B) Passenger cabin handmic announcement
C) Pre-recorded Announcements (PRA)
C) Pre-recorded Announcements (PRA)
How many VHF com radios are usually aboard an aircraft?
A) One
B) Two
C) Three, with the third able to operate with the ACARS system if fitted
C) Three, with the third able to operate with the ACARS system if fitted
Where are the HF transceivers typically installed on an aircraft?
A) In the cockpit
B) In the avionics bay
C) In the cargo hold
B) In the avionics bay
What happens to the tone heard in the headset during the HF tuning process?
A) It gets louder after tuning is complete
B) It continues throughout the flight
C) It stops at the completion of tuning
C) It stops at the completion of tuning
What does each aircraft have in relation to the SELCAL system?
A) A shared SELCAL code with other aircraft
B) A unique four-letter SELCAL code
C) No SELCAL code assigned
B) A unique four-letter SELCAL code
What does Inmarsat stand for?
A) International Marine Satellite
B) International Maritime Satellite
C) Internal Maritime Satellite
B) International Maritime Satellite
What does ACARS stand for?
A) Aircraft Communication, Addressing and Reporting System
B) Airborne Control and Routing System
C) Automated Communication and Reporting System
A) Aircraft Communication, Addressing and Reporting System
