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M11 > 11.5 C Communication > Flashcards

11.5 C Communication Flashcards

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1
Q

What is the primary function of a transmitting antenna?
A. Convert electromagnetic waves into electrical signals
B. Filter radio frequencies
C. Convert electrical signals into electromagnetic waves

A

C. Convert electrical signals into electromagnetic waves

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2
Q

Which of the following antennas can be used for both transmission and reception?
A. Skywave antenna
B. Shared antenna
C. Dual-mode antenna

A

B. Shared antenna

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3
Q

What is the purpose of an RF amplifier in a transmitter?
A. Generate base frequency
B. Amplify radio frequency signals
C. Demodulate incoming signals

A

B. Amplify radio frequency signals

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4
Q

What attribute of a receiver refers to its ability to reproduce the original modulation without distortion?
A. Sensitivity
B. Fidelity
C. Selectivity

A

B. Fidelity

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5
Q

Which receiver type does not change the frequency between the antenna and the detector?
A. TRF receiver
B. Superheterodyne receiver
C. Duplex receiver

A

A. TRF receiver

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6
Q

What does selectivity in a radio receiver refer to?
A. Stability of frequency
B. Amplification power
C. Ability to reject unwanted signals

A

C. Ability to reject unwanted signals

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7
Q

Which type of wave travels along the Earth’s surface by diffraction?
A. Space wave
B. Ground wave
C. Surface wave

A

C. Surface wave

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8
Q

Which medium provides the best relative conductivity for radio waves?
A. Sea water
B. Freshwater lake
C. Loamy soil

A

A. Sea water

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9
Q

The skip zone is:
A. The area of maximum signal strength
B. A region of silence between ground and sky wave coverage
C. A place where AM signals reflect off clouds

A

B. A region of silence between ground and sky wave coverage

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10
Q

What type of loss occurs due to wave spreading as it travels?
A. Ground reflection loss
B. Free space loss
C. Diffraction loss

A

B. Free space loss

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11
Q

In FM, what is varied to encode the message?
A. Amplitude
B. Phase
C. Frequency

A

C. Frequency

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12
Q

Which modulation type changes pulse width based on the baseband signal?
A. PAM
B. PWM
C. PPM

A

B. PWM

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13
Q

What type of digital modulation converts an analog signal into binary code?
A. AM
B. FM
C. PCM

A

C. PCM

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14
Q

Which system provides long-range, global communications?
A. VHF
B. HF
C. SELCAL

A

B. HF

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15
Q

What should you avoid when operating HF systems?
A. During passenger boarding
B. Inside the hangar or during refueling
C. On the runway

A

B. Inside the hangar or during refueling

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16
Q

What is the minimum continuous recording time required for an FDR?
A. 5 hours
B. 12 hours
C. 25 hours

A

C. 25 hours

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17
Q

Where is the CVR/FDR usually installed on an aircraft?
A. Nose section
B. Tail section
C. Wing root

A

B. Tail section

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18
Q

What frequency does the ULB ‘pinger’ transmit on?
A. 121.5 kHz
B. 406 MHz
C. 37.5 kHz

A

C. 37.5 kHz

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19
Q

What is the typical transmission power of a 406 MHz ELT?
A. 0.1 watt
B. 5 watts
C. 10 watts

A

B. 5 watts

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20
Q

What activates the ELT automatically in a crash?
A. Pressure switch
B. G switch
C. Remote button

A

B. G switch

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21
Q

Which signal frequency is used for COSPAS-SARSAT detection?
A. 121.5 MHz
B. 243 MHz
C. 406 MHz

A

C. 406 MHz

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22
Q

Which of the following is a priority 1 in the PA system?
A. Pre-recorded announcements
B. Flight deck announcements
C. Cabin crew handsets

A

B. Flight deck announcements

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23
Q

The Audio Management Unit (AMU) functions to:
A. Decode SELCAL messages
B. Interface user audio with communication/navigation radios
C. Regulate audio volume

Study These Flashcards
A

B. Interface user audio with communication/navigation radios

24
Q

Which system allows flight crew to communicate with ground crew?
A. Cabin Interphone
B. Service Interphone
C. SELCAL

Study These Flashcards
A

B. Service Interphone

25
What does OOOI stand for? A. Out, Off, On, In B. Out, Open, Over, In C. Out, Off, Onboard, Info
A. Out, Off, On, In
26
Which frequency does VHF-C typically use in ACARS? A. 118.000 MHz B. 121.5 MHz C. VHF-3
C. VHF-3
27
Which of the following messages originate from the aircraft in ACARS? A. Uplink messages B. Downlink messages C. Broadcast messages
B. Downlink messages
28
What is one of the key functions of a radio receiver? A. Modulate the carrier wave B. Convert electromagnetic waves to electrical signals C. Generate high-frequency signals
B. Convert electromagnetic waves to electrical signals
29
What does selectivity in a receiver refer to? A. Ability to increase amplification B. Ability to reject unwanted frequencies C. Ability to modulate the incoming signal
B. Ability to reject unwanted frequencies
30
Which characteristic ensures the original modulation is reproduced accurately? A. Stability B. Sensitivity C. Fidelity
C. Fidelity
31
What type of radio wave reflects off the ionosphere for long-distance transmission? A. Space wave B. Ground wave C. Sky wave
C. Sky wave
32
Which radio wave travels along the Earth's surface by diffraction? A. Surface wave B. Sky wave C. Space wave
A. Surface wave
33
What is the major cause of free space loss in radio transmission? A. Absorption by rain B. Spreading of the wavefront C. Magnetic interference
B. Spreading of the wavefront
34
In AM (Amplitude Modulation), which signal property varies? A. Frequency B. Amplitude C. Phase
B. Amplitude
35
Which modulation type changes frequency while keeping amplitude constant? A. AM B. FM C. PAM
B. FM
36
What is Pulse Code Modulation (PCM) used for? A. Converting analogue signals to digital B. Increasing signal amplitude C. Reducing transmission frequency
A. Converting analogue signals to digital
37
Where are static dischargers typically installed on aircraft? A. Engine cowlings B. Trailing edges and tips of control surfaces C. Fuselage midsection
B. Trailing edges and tips of control surfaces
38
What kind of static builds up from friction with particles in the air? A. Precipitation static B. Radiated static C. Conducted interference
A. Precipitation static
39
What is the frequency range of HF communication? A. 118–136.975 MHz B. 2–29.999 MHz C. 406–500 MHz
B. 2–29.999 MHz
40
What must be done to initiate antenna tuning in an HF system? A. Press the sidetone switch B. Select frequency and key the transmitter C. Increase transmission power
B. Select frequency and key the transmitter
41
Why is HF transmission prohibited during aircraft refueling? A. It interferes with refueling valves B. RF energy poses an ignition risk C. It disrupts fuel quantity gauges
B. RF energy poses an ignition risk
42
What type of communication is VHF primarily used for? A. Intercontinental voice B. Short-range line-of-sight C. Underwater signaling
B. Short-range line-of-sight
43
Which system allows global data transmission from aircraft? A. VHF B. ACARS C. ADS-B
B. ACARS
44
What does ACARS use for dedicated VHF data communication? A. VHF-3 or VHF-C B. HF center band C. SELCAL channel
A. VHF-3 or VHF-C
45
What color are Flight Data Recorders (FDR) typically? A. Black B. Orange C. Yellow
B. Orange
46
What is the primary purpose of the Underwater Locator Beacon (ULB)? A. Send emergency voice messages B. Emit a signal for underwater detection C. Transmit data to satellites
B. Emit a signal for underwater detection
47
What does the TEST/RESET pushbutton do on the ELT control panel? A. Activates the ELT manually B. Returns the ELT to ARMED mode C. Transmits a distress tone
B. Returns the ELT to ARMED mode
48
Which panel allows crew to access audio communication systems? A. AFDS B. ACP C. RCDU
B. ACP
49
What function does SELCAL serve in aviation communication? A. Encrypts all radio signals B. Provides coded ground-to-air alerts C. Selects cabin PA volume
B. Provides coded ground-to-air alerts
50
What happens if the oxygen mask is not correctly stowed? A. SELCAL won’t function B. Mask mic remains active C. Cabin lights dim
B. Mask mic remains active
51
What component in an AM transmitter creates the RF carrier? A. Modulator B. RF Oscillator C. RF AMP
B. RF Oscillator
52
What is the main function of the modulator in an AM transmitter? A. Amplify signals B. Generate frequency C. Impose audio on RF carrier
C. Impose audio on RF carrier
53
What is the frequency range of High Frequency (HF) radio? A) 300 kHz – 3 MHz B) 3 MHz – 30 MHz C) 30 MHz – 300 MHz
B) 3 MHz – 30 MHz
54
What is the frequency range of Very High Frequency (VHF) radio? A) 3 MHz – 30 MHz B) 30 MHz – 300 MHz C) 300 MHz – 3 GHz
B) 30 MHz – 300 MHz
55
What is the frequency range of Ultra High Frequency (UHF) radio? A) 30 MHz – 300 MHz B) 300 MHz – 3000 MHz C) 3 GHz – 30 GHz
B) 300 MHz – 3000 MHz

M11 (35 decks)

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