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17D Block 4 Flashcards | StudBud
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17D Block 4
17D Block 4
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Questions
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Answers
1
Which frequency range is best for surface propagation?
Microwave frequencies
Low frequencies
Very high frequencies
Ultra high frequencies
2
What is azimuth?
Range Resolution
The angle of the radar device
Distance in nautical miles that the radar can detect an object
Azimuth Resolution
3
What does the orange button on a Motorola LMR do?
Initiates over-the-air-rekey
Turns on the backlight
Allows radio to transmit voice
Activates an emergency call
4
How would you change a radar’s azimuth resolution?
change beam width
Look angle of the radar device
Range Resolution
change pulse width
5
What is the Mobile User Objective System (MUOS)
very high frequency (VHF) band
Narrowband
Wideband
supports a worldwide, multi-service population
supports a local, multi-service population
ultra high frequency (UHF) band
6
What is grounding?
Used to test resistance of grounding rods in soil
Used to create path of least for electrical current to the ground
Measures signal integrity based on quantity of incorrectly received bits
Detects and analyzes every source signal from a radio wave input
Used to measure continuity, voltage and resistance
7
Complete the sentence: Higher frequency means...
Longer wavelength
Slower speed
Shorter wavelength
Lower energy
8
What requirements must we meet to be FMC from an equipment standpoint
Current with latest TCTO
Skill level
No broken or missing items off LOGDET
Deployable
On an equipment account
Qualified on UTC
9
Short paragraph description of mission capabilities.
MANFOR
LOGDET
MISCAP
MEFPAK
10
What is the role of the modulator?
Encode information
Generate carrier wave
Demodulate signal
Amplify signal
11
What is Global Broadcast System (GBS)
Broadband SATCOM hotspot at 492 Kbps
one-way wideband transmission broadcast
Provide long haul high capacity comms to DoD
Provides POTUS, SECDEF and armed forces with survival SATCOM
12
Which satellite orbit is closer to Earth with a small sensor footprint?
Molniya Orbit
Geostationary Orbit
Medium Earth Orbit
Low Earth Orbit
13
Whose call sign do you start a radio call with
Sender
Receiver
All Stations
Phonetics
14
What is the primary goal of radio jamming?
Disrupt enemies use of the communication spectrum
Transmit data
Boost frequency
Enhance signal
15
Which orbit needs fewer satellites for worldwide coverage; needs larger antennas/power and provides PNT data?
Molniya Orbit
Geostationary Orbit
Medium Earth Orbit
Low Earth Orbit
16
How does ECM affect enemy operations?
Enhances their capabilities
Increases their efficiency
Confuses their systems
Reduces their morale
17
What are examples of Mission Generation Force Elements (MGFE)
Command and control
Global Precision Attack
ISR
Air Superiority
Demand force teams
Intra-Theatre Airlift
18
Which frequency range defines VHF?
3 to 30 MHz
1 to 10 MHz
300 to 3000 MHz
30 to 300 MHz
19
What is the primary advantage of Phase Modulation?
Simplicity of design
Lower power consumption
Higher bandwidth efficiency
Wider frequency range
20
What is frequency in physics?
Amplitude of waves
Number of cycles
Rate of change
Speed of light
21
Computer controlled system allows large number of users to “share” small number of frequencies dynamically
Half-Duplex
Conventional
Duplex
Trunked
Simplex
22
What does UHF stand for?
Ultra High Fidelity
Universal High Fidelity
Ultra High Frequency
Universal High Frequency
23
True or false: Radio frequencies can be used for navigation.
False
True
24
Which satellite orbit sees 1/3 of earth; highest cost to launch, sees everything but N/S poles?
Low Earth Orbit
Medium Earth Orbit
Geostationary Orbit
Molniya Orbit
25
Which technique avoids interference in communication?
Signal attenuation
Pulse compression
Overpowering
Frequency hopping
26
Complete the sentence: Phase Modulation is often used in...
Analog radio systems
Digital communication systems
Simple audio systems
Basic telephony
27
Detects, processes, distributes, and displays weather radar data at 248 nmi in clear weather
AN/GPN-30
AN/TPS-75
Precision Approach Radar
WSR-88
28
uses two frequencies & allows simultaneous, 2-way communication
Half-Duplex
Duplex
Conventional
Simplex
Trunked
29
Explain the relationship between frequency and precipitation fade.
The higher the frequency the lower precipitation interference
The higher the frequency the more scintillation
The lower the frequency the more precipitation interference
The higher the frequency the more precipitation interference
30
How does directivity impact antenna performance?
Improves power handling
Increases bandwidth
Enhances signals focus toward a specific direction
Reduces noise levels
31
radios are programmed to operate independently
Simplex
Trunked
Conventional
Half-Duplex
Duplex
32
What is the purpose of the detector?
Amplifies signals
Mixes frequencies
Filters noise
Recovers intelligence
33
What is the role of a transceiver in HF radio?
Transmit and receive signals
Only transmit signals
Amplify signals
Only receive signals
34
What is the relationship between gain and directivity?
Gain equals directivity
Directivity defines gain
No relationship exists
Gain is relative signal strength in dBi
35
Where would BEAR resources be applied?
Secure the Air Base
Operate the Air Base
Open the Air Base
Robust the Air Base
36
Supports AEW with 200 user devices and has a third optional enclave
6KTGB
6KTGK
6KTGS
37
Which technology is commonly used in ECM?
Radar jamming
Laser guidance
Stealth
GPS tracking
38
What happens to frequency when wavelength increases?
Stays the same
Doubles
Decreases
Increases
39
What is the unit of frequency?
Volt
Watt
Decibel
Hertz
40
Deployable XCOMS: Provide C4 support to regional combatant commands, SOCOM, and other agencies as directed
EIS
JCSE
ACOMS
ACS
SOCS
CCS
41
Which technique involves overcoming a jammed signal?
Spoofing
Modulation
Encryption
Overpowering
42
Which technology counters radio jamming ensuring friendly use of the spectrum?
Signal boosting
Encryption
Data compression
Frequency hopping
43
Which device is essential for tuning HF radio frequencies?
Receiver
Modulator
Tuner
Amplifier
44
What is the typical wavelength range for UHF?
10 to 100 meters
100 to 1000 meters
0.1 to 1 meter
1 to 10 meters
45
Which satellite system provides us position, navigation and timing
Low Earth Orbit
Geostationary Orbit
Molniya Orbit
Medium Earth Orbit
46
What phenomenon can enhance HF radio signals?
Near-field effect
Groundwave propagation
Skywave propagation
Line-of-sight
47
What is surface wave propagation?
Waves in vacuum LF MF
Waves through air EHF UHF
Waves along surface/ground LF MF
Waves through solid HF MF
48
Supports 10 user devices and has NIPR, SIPR, Voice and ROIP
6KTGB
6KTGF
6KTGS
6KTGK
49
Which organization regulates amateur HF radio operations?
ITU
FCC (non-federal) and NTIA (Federal)
NATO
IEEE
50
Which High Frequency (HF) radio is best for line-of-sight (LOS) and beyond line-of-sight (BLOS) communications?
PRC-160
PRC-152
ROIP
PRC-163
PRC-117
51
What is Wideband Global SATCOM (WGS)
Provides POTUS, SECDEF and armed forces with survival SATCOM
Provide long haul high capacity backbone comms to thousands in the DoD
one-way wideband transmission broadcast
Broadband SATCOM hotspot at 492 Kbps
52
What occurs during the Reset phase of AFFORGEN?
Reintegration and reconstitution
Certification and Joint Exercises
Training towards peak readiness to meet UTC requirements
Rotational Deployments SECDEF taskings
53
This radar system tracks aircraft down a glide path during inclement weather while on its final approach to the runway
AN/GPN-30
AN/TPS-75
Precision Approach Radar
WSR-88
54
Deployable XCOMS: Provide Situational awareness of airspace in contested environments and supply ABM capabilities
JCSE
ACS
CCS
EIS
SOCS
ACOMS
55
How would you improve a radar’s range resolution?
Range Resolution
change pulse width
change beam width
Look angle of the radar device
56
First line of defense surveillance system; 240 nmi range; IFF
AN/GPN-30
Precision Approach Radar
WSR-88
AN/TPS-75
57
True or false: Radio frequencies can be harmful to health.
True
False
58
Which of the following is a type of ECM?
Cybersecurity
Jamming
Network analysis
Data mining
59
What is linear polarization?
Waves in one plane (horizontal or vertical)
Waves in multiple planes
Waves in random directions
Waves in circular motion
60
What is the purpose of a radio antenna?
Transmit signals
Store energy
Amplify sound
Filter noise
61
Airport Surveillance Radar (ASR) – detects aircraft position and weather conditions
Precision Approach Radar
AN/GPN-30
WSR-88
AN/TPS-75
62
uses one frequency to transmit and receive
Trunked
Half-Duplex
Duplex
Conventional
Simplex
63
Allows radios to connect to non-radio device
PRC-163
PRC-117
PRC-160
PRC-152
ROIP
64
Which modulation type is used in digital communication?
Phase Shift Keying
Amplitude Modulation
Analog Modulation
Frequency Modulation
65
Which component generates the carrier wave?
Amplifier
Transducer
Oscillator
Modulator
66
What is the primary advantage of HF radio?
Low power consumption
Long-distance communication
Compact size
High data rates
67
What is range?
Range Resolution
Azimuth Resolution
The angle of the radar device
Distance in nautical miles that the radar can detect an object
68
Which frequency range defines UHF?
30 kHz to 300 kHz
300 MHz to 3 GHz
30 MHz to 300 MHz
3 GHz to 30 GHz
69
Which device is essential for VHF communication?
Receiver only
Transceiver
Oscilloscope
Amplifier
70
Supports AEG and smaller with 25 user ports and has ROIP, Link-16 and TACSAT
6KTGB
6KTGS
6KTGK
71
What is the purpose of the audio filter?
Removes unwanted frequencies
Mixes frequencies
Amplifies audio signals
Demodulates signals
72
Which device can detect jamming?
Television
Radio receiver
Smartphone
Spectrum analyzer
73
Which frequency is considered ultra-high frequency?
300 kHz
30 MHz
3 GHz
300 MHz
74
Deployable XCOMS: Deliver C2 communications to Air Component Commanders
ACOMS
EIS
CCS
JCSE
ACS
SOCS
75
The ability of a radar to differentiate two targets at the same azimuth but different ranges
Distance in nautical miles that the radar can detect an object
The angle of the radar device
Range Resolution
Azimuth Resolution
76
What frequency range defines HF radio?
3 to 30 MHz
1 to 3 MHz
30 to 300 MHz
300 to 3000 MHz
77
What is the role of 'chaff' in ECM?
Signal amplification
Frequency modulation
Degrade enemy Radar
Data transmission
78
Which modulation type is more susceptible to noise?
Frequency Modulation
Digital Modulation
Amplitude Modulation
Phase Modulation
79
What is AEHF/MILSTAR?
Provides POTUS, SECDEF and armed forces with survival SATCOM
one-way wideband transmission broadcast
Provide long haul high capacity comms to DoD
Broadband SATCOM hotspot at 492 Kbps
80
How do you end a conversation on the radio?
Name, rank, Serial number
Out
Until Again
Over
81
Which application commonly uses circular polarization?
Local broadcasting
Satellite communications
Wi-Fi networks
Cellular networks
82
Which AFFORGEN Force Elements make up an Expeditionary Airbase (XAB)
Demand force teams
Establish the airbase
Operate the airbase
Robust airbase
Command and control
Open the airbase
83
Deployable XCOMS: Robusting a comm site, installing long term communications infrastructure
JCSE
ACS
EIS
CCS
SOCS
ACOMS
84
Deployable XCOMS: Deployable Base Communications
JCSE
CCS
SOCS
EIS
ACS
ACOMS
85
The ability of a radar to differentiate between two targets close in azimuth at the same range?
Range Resolution
Distance in nautical miles that the radar can detect an object
The angle of the radar device
Azimuth Resolution
86
What is a key advantage of Amplitude Modulation?
Higher bandwidth usage
Simplicity of design
Complex signal processing
Lower power consumption
87
What is the range of VHF frequencies?
3000-30000 MHz
300-3000 MHz
30-300 MHz
3-30 MHz
88
What is a BGAN?
Provide long haul high capacity backbone comms to thousands in the DoD
Broadband SATCOM hotspot at 492 Kbps
one-way wideband transmission broadcast
Provides POTUS, SECDEF and armed forces with survival SATCOM
89
uses two frequencies & allows 1-way communication
Simplex
Half-Duplex
Duplex
Trunked
Conventional
90
What is a common use of UHF radio?
Deep space
Underwater communication
Television broadcasting
GPS
Satellite communication
Microwave
91
What is the range of UHF communications?
30-300 MHz
30-300 km
300 MHz-3 GHz
1-10 km
92
What causes electronic interference?
Cosmic rays
Magnetic fields
Natural phenomena
Natural events or Man-made devices
93
Which satellite orbit is used for communication at the highest latitudes?
Geostationary Orbit
Low Earth Orbit
Molniya/Polar Orbit
Medium Earth Orbit
94
What is the effect of solar activity on HF radio?
Increases transmission power
Enhances receiver sensitivity
Reduces frequency range
Affects signal quality
95
How does frequency hopping prevent eavesdropping?
By filtering signals
By changing frequencies
By increasing power
By compressing pulses
