3D153 CDC Vol. 3
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Questions and Answers
- 1.
Which of the following is not one of the three distinct elements that work together to make satellite communication (SATCOM) possible?
- A.
Space Segment
- B.
Control Segment
- C.
Payload Segment
- D.
Terminal Segment
Correct Answer
C. Payload SegmentExplanation
The payload segment is not one of the three distinct elements that work together to make satellite communication (SATCOM) possible. The three elements that do work together are the space segment, control segment, and terminal segment. The space segment consists of the satellites themselves, which are responsible for transmitting and receiving signals. The control segment involves the ground-based facilities that monitor and control the satellites. The terminal segment includes the devices used by users to access and communicate through the satellites. The payload segment, on the other hand, refers to the specific equipment or technology carried by the satellites to perform specific functions, such as weather monitoring or television broadcasting.Rate this question:
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- 2.
Which of the following is not a function of the (satellite communications) SATCOM control segment?
- A.
Spacecraft control
- B.
Network control
- C.
Payload control
- D.
Ground control
Correct Answer
D. Ground controlExplanation
The SATCOM control segment consists of various functions that are essential for the operation of satellite communications. Spacecraft control involves managing the satellite's position and orientation in space. Network control ensures the proper functioning of the communication network. Payload control focuses on the management and operation of the satellite's payload, which includes the equipment and systems for transmitting and receiving signals. Ground control, on the other hand, refers to the control and monitoring of the ground-based infrastructure and operations related to satellite communications. Therefore, the correct answer is ground control, as it is not a function directly related to the operation of the satellite itself.Rate this question:
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- 3.
Which term describes the longest distance across an elliptical orbit?
- A.
Minor axis
- B.
Major axis
- C.
Apogee
- D.
Perigee
Correct Answer
B. Major axisExplanation
The major axis is the correct answer because it refers to the longest distance across an elliptical orbit. In an ellipse, the major axis is the line segment that passes through the center of the ellipse and is the longest distance from one end of the ellipse to the other. It is used to determine the size and shape of the elliptical orbit. The minor axis, on the other hand, is the shorter distance across the ellipse. Apogee and perigee, while related to orbits, specifically refer to the points in an orbit where an object is farthest and closest to the Earth, respectively.Rate this question:
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- 4.
What is the inclination of a polar orbit?
- A.
0 degrees
- B.
45 degrees
- C.
90 degrees
- D.
180 degrees
Correct Answer
C. 90 degreesExplanation
The inclination of a polar orbit is 90 degrees. A polar orbit is an orbit that passes over or near both poles of a celestial body. In this type of orbit, the satellite travels from the North Pole to the South Pole and vice versa, covering the entire surface of the planet. The inclination angle measures the angle between the orbital plane and the equatorial plane of the celestial body. In the case of a polar orbit, the inclination is 90 degrees because the orbital plane is perpendicular to the equatorial plane.Rate this question:
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- 5.
Which are the two types of communications satellites?
- A.
Delay and passive
- B.
Active and passive
- C.
Delay and real-time
- D.
Active and real-time
Correct Answer
B. Active and passiveExplanation
Communications satellites can be categorized into two types based on their functionality: active and passive. Active communication satellites are equipped with transponders that receive signals from Earth, amplify them, and then transmit them back to another location on Earth. These satellites actively participate in the communication process. On the other hand, passive communication satellites act as reflectors, simply bouncing signals from one location on Earth to another without amplification or processing. Therefore, the correct answer is "Active and passive."Rate this question:
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- 6.
Which satellite reflects signals transmitted towards it?
- A.
Delay
- B.
Active
- C.
Passive
- D.
Real-time
Correct Answer
C. PassiveExplanation
Passive satellites reflect signals transmitted towards them. Unlike active satellites, which generate their own signals, passive satellites rely on receiving and reflecting signals from other sources. These satellites are commonly used for communication purposes, such as relaying television signals or providing GPS services. They do not actively amplify or modify the signals they receive, but rather bounce them back to Earth. This passive behavior allows for a more straightforward and cost-effective satellite design, as they do not require complex onboard transmitters.Rate this question:
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- 7.
Which of the following satellite look angle methods is provided by (satellite communications) SATCOM planners?
- A.
Programmed ground terminal
- B.
Satellite access authorization
- C.
Computer based application
- D.
Satellite slide rule
Correct Answer
B. Satellite access authorizationExplanation
Satellite access authorization is a method provided by SATCOM planners for determining the look angle of a satellite. This method involves obtaining authorization to access the satellite's signals, which in turn requires knowledge of the satellite's position and look angle. By obtaining the necessary authorization, SATCOM planners can ensure proper communication with the satellite and optimize the performance of satellite communications systems. The other options listed, such as programmed ground terminal, computer-based application, and satellite slide rule, do not directly relate to determining the look angle of a satellite.Rate this question:
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- 8.
Which satellite access technique is being used when all channels are pooled and used by any station according to its instantaneous traffic load?
- A.
Code division multiple access (CDMA)
- B.
Time division multiple access (TDMA)
- C.
Demand assigned multiple access (DAMA)
- D.
Frequency division multiple access (FDMA)
Correct Answer
C. Demand assigned multiple access (DAMA)Explanation
Demand assigned multiple access (DAMA) is the satellite access technique being used when all channels are pooled and used by any station according to its instantaneous traffic load. In DAMA, the available channels are dynamically assigned to stations based on their demand, allowing for efficient utilization of satellite resources. This technique ensures that each station gets access to the required number of channels when needed, optimizing the overall system capacity. CDMA, TDMA, and FDMA are not suitable options as they do not provide the flexibility to dynamically allocate channels based on traffic load.Rate this question:
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- 9.
Conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces (GMF) satellite resources that cannot be settled by the Defense Information Systems Agency (DISA) and the regional satellite communications support center (RSSC) are resolved by the
- A.
Joint Staff
- B.
Combatant Commander (COCOM)
- C.
Consolidated Space Operations Center (CSOC)
- D.
Defense Information Systems Agency Operations Control Complex (DOCC)
Correct Answer
A. Joint StaffExplanation
The Joint Staff is the correct answer because it is responsible for resolving conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces (GMF) satellite resources that cannot be settled by the Defense Information Systems Agency (DISA) and the regional satellite communications support center (RSSC). The Joint Staff is comprised of high-ranking military officers from different branches of the armed forces and serves as the primary military advisory body to the President and Secretary of Defense. They have the authority to make decisions and resolve conflicts at the highest level of military command.Rate this question:
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- 10.
One of the functions of the telecommunication certification office is to
- A.
Assign a circuit number to the telecommunication service request
- B.
Maintain case files on all major command (MAJCOM) circuits
- C.
Ensure the user agency is prepared to pay for the service
- D.
Review the circuit priority against mission needs
Correct Answer
C. Ensure the user agency is prepared to pay for the serviceExplanation
The function of the telecommunication certification office is to ensure that the user agency is prepared to pay for the service. This means that before providing the telecommunication service, the office verifies that the user agency has the necessary funds or budget to cover the cost. This step ensures that the service provider does not incur any financial losses and that the user agency is financially responsible for the service they are requesting.Rate this question:
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- 11.
Telecommunications service orders are issued by the
- A.
Department of Defense (DOD)
- B.
User's technical control facility
- C.
National Communications System (NCS)
- D.
Defense Information Systems Agency (DISA)
Correct Answer
D. Defense Information Systems Agency (DISA)Explanation
The correct answer is Defense Information Systems Agency (DISA). DISA is responsible for issuing telecommunications service orders. The Department of Defense (DOD) is a government agency, but it does not specifically issue telecommunications service orders. The user's technical control facility is responsible for managing and controlling the technical aspects of the user's telecommunications system, but it does not issue service orders. The National Communications System (NCS) is responsible for coordinating and planning national security and emergency preparedness telecommunications, but it does not issue service orders. Therefore, the correct answer is DISA.Rate this question:
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- 12.
Astronomical time is based on
- A.
Atomic clock oscillations
- B.
Apparent constellation movement
- C.
The moon's rotation about the earth
- D.
The apparent motion of the sun in the sky
Correct Answer
D. The apparent motion of the sun in the skyExplanation
Astronomical time is based on the apparent motion of the sun in the sky. This is because the sun's position in the sky changes throughout the day, allowing us to measure time based on its movements. This is the basis for solar time, which is used in many astronomical calculations and observations.Rate this question:
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- 13.
What time scale gives us a universally agreed to standard time scale with the ability and accuracy of atomic time and synchronous operation with the earth's motion about the sun we can depend on?
- A.
Atomic time
- B.
Mean solar time
- C.
Astronomical time
- D.
Coordinated universal time
Correct Answer
D. Coordinated universal timeExplanation
Coordinated Universal Time (UTC) is the time scale that provides a universally agreed standard time with the accuracy of atomic time and synchronization with the Earth's motion around the sun. UTC is based on International Atomic Time (TAI) but includes leap seconds to account for variations in the Earth's rotation. It is used as a global time reference and is essential for various fields including telecommunications, aviation, and global navigation systems.Rate this question:
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- 14.
What two factors cause a quartz oscillator's resonant requency to drift?
- A.
Humidity and aging
- B.
Temperature and aging
- C.
Humidity and operating frequency
- D.
Temperature and operating frequency
Correct Answer
B. Temperature and agingExplanation
A quartz oscillator's resonant frequency can drift due to temperature and aging. Temperature changes can affect the stability of the quartz crystal, causing its resonant frequency to shift. Aging refers to the gradual deterioration of the quartz crystal over time, which can also lead to a change in its resonant frequency. Both factors contribute to the drift in the oscillator's resonant frequency.Rate this question:
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- 15.
The operation of the atomic clock is based on the phenomenon that
- A.
Crystals resonate when an electric charge is applied
- B.
Atoms release energy at a particular resonant frequency
- C.
Atoms are sensitive to temperature and directional effects
- D.
When atoms are split they produce predictable nuclear reactions
Correct Answer
B. Atoms release energy at a particular resonant frequencyExplanation
The operation of the atomic clock is based on the phenomenon that atoms release energy at a particular resonant frequency. This means that when an atom is excited, it will emit energy in the form of electromagnetic radiation at a specific frequency. By measuring this frequency, the atomic clock can accurately keep time.Rate this question:
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- 16.
To determine the number of hours coordinated universal time (UTC) differs from your local time, you must determine the number of time zones between your location and the location of the zero
- A.
Median
- B.
Latitude
- C.
Parallel
- D.
Meridian
Correct Answer
D. MeridianExplanation
The meridian is an imaginary line that runs from the North Pole to the South Pole and passes through the zero degrees longitude, also known as the Prime Meridian. To determine the number of hours coordinated universal time (UTC) differs from your local time, you need to determine the number of time zones between your location and the location of the Prime Meridian. This is because each time zone is generally 15 degrees of longitude wide, and each hour represents 15 degrees of longitude. Therefore, by calculating the number of time zones, you can determine the time difference between UTC and your local time.Rate this question:
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- 17.
Coordiinated universal time (UTC) is based on what kind of clock system?
- A.
12-hour
- B.
24-hour
- C.
Astronomical
- D.
Amplitude modulation and pulse modulation
Correct Answer
B. 24-hourExplanation
Coordinated Universal Time (UTC) is based on a 24-hour clock system. This system divides the day into 24 equal parts, with each part representing one hour. UTC is used as a standard time reference worldwide, allowing for consistent timekeeping and coordination across different time zones. The use of a 24-hour clock system eliminates confusion and ambiguity that can arise from using a 12-hour clock system, which requires distinguishing between AM and PM.Rate this question:
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- 18.
A number of organizations can maintain accurate time-of-day clocks by referencing a standard time interval of one
- A.
Second
- B.
Minute
- C.
Hour
- D.
Day
Correct Answer
A. SecondExplanation
Organizations can maintain accurate time-of-day clocks by referencing a standard time interval of one second. This is because a second is a universally accepted and precise unit of time measurement. By synchronizing their clocks with this standard, organizations can ensure accuracy and consistency in timekeeping. Additionally, the use of seconds allows for more precise measurements and calculations, making it a suitable choice for maintaining accurate time-of-day clocks.Rate this question:
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- 19.
The agency responsible for coordinated universal time (UTC) is the
- A.
United States Naval Observatory (USNO)
- B.
International Bureau of Weights and Measures (BIPM)
- C.
Precision Measurement Equipment Laboratory (PMEL)
- D.
National Institute of Standards and Technology
Correct Answer
D. National Institute of Standards and TechnologyExplanation
The National Institute of Standards and Technology (NIST) is responsible for coordinating universal time (UTC). NIST is a federal agency that develops and promotes measurement standards, including timekeeping standards. They maintain and distribute atomic clocks, which are used to determine UTC. The United States Naval Observatory (USNO) also plays a role in maintaining and disseminating time, but NIST is the primary agency responsible for UTC. The International Bureau of Weights and Measures (BIPM) and Precision Measurement Equipment Laboratory (PMEL) are not directly responsible for coordinating UTC.Rate this question:
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- 20.
What is multiplexing?
- A.
Transmitting one signal over multiple transmission paths
- B.
Transmitting one signal multiple times over a single transmission path
- C.
Combining multiple information channels onto a common transmission medium
- D.
Combining multiple signals for transmission over separate, individual transmission paths
Correct Answer
C. Combining multiple information channels onto a common transmission mediumExplanation
Multiplexing refers to the process of combining multiple information channels onto a common transmission medium. This allows for efficient use of the available bandwidth by transmitting multiple signals simultaneously. By combining these channels, it becomes possible to transmit more information over a single transmission path, maximizing the utilization of the resources.Rate this question:
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- 21.
What specifically does wavelength division multiplexing assign each incoming optical signal?
- A.
Pseudorandom code
- B.
Frequency of light
- C.
Radio frequency
- D.
Time slot
Correct Answer
B. Frequency of lightExplanation
Wavelength division multiplexing assigns each incoming optical signal a specific frequency of light. This means that each signal is transmitted at a different wavelength, allowing multiple signals to be sent simultaneously over a single optical fiber. By assigning different frequencies to each signal, they can be separated and easily distinguished at the receiving end, enabling efficient and high-capacity data transmission.Rate this question:
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- 22.
Which multiplexing division technique samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?
- A.
Wavelength
- B.
Frequency
- C.
Code
- D.
Time
Correct Answer
D. TimeExplanation
The correct answer is "Time." Time division multiplexing (TDM) is a multiplexing technique that samples each low-speed channel in sequence, interleaves the bits or characters, and then transmits them at a high speed. TDM divides the available time slots into equal intervals, allocating specific time slots to each channel for transmission. This allows multiple signals to be transmitted simultaneously over a single communication channel, maximizing the utilization of the channel's capacity.Rate this question:
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- 23.
Which of the following relies on the transmitter to send multiple copies of the same message to the distant end using a predetermined algorithm?
- A.
Controlled diphase
- B.
Non-return to zero
- C.
Forward error correction
- D.
Quadrature phase shift keying (QPSK)
Correct Answer
C. Forward error correctionExplanation
Forward error correction is a technique that relies on the transmitter to send multiple copies of the same message to the distant end using a predetermined algorithm. This algorithm allows the receiver to detect and correct errors that may have occurred during transmission. By sending redundant information along with the original message, forward error correction ensures that the receiver can reconstruct the original data even if some bits are corrupted or lost. This technique is commonly used in communication systems to improve the reliability and quality of data transmission.Rate this question:
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- 24.
Which SATCOM system module is used to produce the final transmit frequency?
- A.
Up converter
- B.
Modulator
- C.
Amplifier
- D.
Antenna
Correct Answer
A. Up converterExplanation
The up converter is the SATCOM system module used to produce the final transmit frequency. This module takes the baseband signal and converts it to a higher frequency suitable for transmission through the antenna. It essentially "up converts" the frequency to the desired transmit frequency. The modulator is responsible for modulating the signal, the amplifier boosts the signal power, and the antenna is used for transmitting and receiving the signal. However, it is the up converter that specifically handles the frequency conversion process.Rate this question:
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- 25.
Which type of power amplifier uses semiconductor transistors designed for microwave and higher frequency RF operation?
- A.
Klystron
- B.
Solid state
- C.
Traveling wave tube amplifier
- D.
Metal oxide field-effect transistor (MOSFET)
Correct Answer
B. Solid stateExplanation
Solid state power amplifiers use semiconductor transistors designed for microwave and higher frequency RF operation. This type of power amplifier is commonly used in various applications such as telecommunications, radar systems, and satellite communications. Solid state amplifiers offer advantages such as compact size, high efficiency, and reliability compared to other types of power amplifiers. They are capable of providing high power output at microwave and RF frequencies, making them suitable for use in these applications.Rate this question:
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- 26.
Which module is the first step of the receive signal path?
- A.
Low noise amplifier
- B.
Down converter
- C.
Up converter
- D.
Demodulator
Correct Answer
A. Low noise amplifierExplanation
The low noise amplifier is the first step in the receive signal path because it amplifies the weak incoming signal from the antenna while introducing minimal noise. This is important because the signal is often very weak and needs to be strengthened before further processing. The low noise amplifier helps to improve the signal-to-noise ratio, allowing for better reception and subsequent processing by the other modules in the receive signal path.Rate this question:
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- 27.
Which module strips away the intelligence from the Intermediate frequency?
- A.
Low noise amplifier
- B.
Down converter
- C.
Up converter
- D.
Demodulator
Correct Answer
D. DemodulatorExplanation
The demodulator module is responsible for extracting the original information signal from the modulated carrier signal. It removes the intelligence or the modulation from the intermediate frequency by converting it back to the baseband frequency. This process allows the demodulator to recover the original data or intelligence that was encoded onto the carrier signal. The other modules mentioned, such as the low noise amplifier, down converter, and up converter, are not directly involved in stripping away the intelligence from the intermediate frequency.Rate this question:
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- 28.
When establishing a communication link with a satellite the required sequence of events is
- A.
Frequency acquisition, antenna pointing, and satellite tracking
- B.
Satellite acquisition, satellite tracking, power correction, and antenna pointing
- C.
Orbit prediction, antenna pointing, satellite acquisition, and satellite tracking
- D.
Orbit prediction, space acquisition, and frequency acquisition
Correct Answer
C. Orbit prediction, antenna pointing, satellite acquisition, and satellite trackingExplanation
The correct answer is orbit prediction, antenna pointing, satellite acquisition, and satellite tracking. This sequence of events is necessary when establishing a communication link with a satellite. First, orbit prediction is done to determine the satellite's position. Then, antenna pointing is performed to align the ground antenna with the satellite. Next, satellite acquisition involves finding and identifying the satellite in the predicted orbit. Finally, satellite tracking is done to continuously monitor the satellite's position and make necessary adjustments to maintain the communication link.Rate this question:
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- 29.
Which tracking method requires no input from a satellite?/
- A.
Programmed track
- B.
Automatic track
- C.
Pseudoconscan
- D.
Step track
Correct Answer
A. Programmed trackExplanation
The programmed track method does not require any input from a satellite. In this method, the track is pre-programmed into the tracking system, and the system follows the programmed track without any real-time input from a satellite. This can be useful in situations where satellite communication is not available or not required, and the track can be predetermined based on other sources of information.Rate this question:
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- 30.
What signal originating from the satellite do we use to acquire and track the satellite?
- A.
Beacon
- B.
Telemetry
- C.
Ephemeris
- D.
Communication
Correct Answer
A. BeaconExplanation
The signal originating from the satellite that we use to acquire and track the satellite is called a beacon. A beacon is a continuous signal transmitted by the satellite that helps in identifying and locating the satellite. It provides essential information such as the satellite's position, velocity, and timing data, which are crucial for acquiring and maintaining a connection with the satellite. By using the beacon signal, we can accurately acquire and track the satellite's movements and ensure efficient communication with it.Rate this question:
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- 31.
Which type of diversity do you have when the same frequency radiates simultaneously in two different planes?
- A.
Polarization
- B.
Crossband
- C.
Frequency
- D.
Space
Correct Answer
A. PolarizationExplanation
When the same frequency radiates simultaneously in two different planes, it is referred to as polarization diversity. This occurs when electromagnetic waves are transmitted in different orientations or polarizations. Polarization diversity is commonly used in wireless communication systems to improve signal quality and reduce interference.Rate this question:
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- 32.
Which type of diversity requires two antennas, two receivers, and two transmitters?
- A.
Polarization
- B.
Crossband
- C.
Frequency
- D.
Space
Correct Answer
A. PolarizationExplanation
Polarization diversity requires two antennas, two receivers, and two transmitters. This type of diversity is used to improve the performance and reliability of wireless communication systems by transmitting and receiving signals with different polarizations. By using two antennas with orthogonal polarizations, the system can mitigate the effects of multipath fading and improve the signal quality. This allows for better coverage, increased data rates, and reduced interference in wireless communication.Rate this question:
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- 33.
What is the tropo/satellite support radio frequency range?
- A.
4.4 to 5.25 GHz
- B.
7.25 to 8.4 GHz
- C.
14.4 to 15.25 GHz
- D.
17.25 to 18.4 GHz
Correct Answer
C. 14.4 to 15.25 GHzExplanation
The tropo/satellite support radio frequency range is 14.4 to 15.25 GHz. This range of frequencies is commonly used for communication between tropospheric scatter systems and satellite communication systems. These frequencies are chosen because they provide a good balance between signal propagation and bandwidth availability for long-distance communication.Rate this question:
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- 34.
What are the Air Force Satellite Control Network (AFSCN) command and control nodes?
- A.
Environmental Satellite Operations Center at Schriever AFB, CO, and National Oceanographic and Atmospheric Administration (NOAA) Satellite Operations Control Center at Suitland, MD.
- B.
Environmental Satellite Operations Center at Schriever AFB, CO, and Multi Purpose Satellite Operations Center, Offutt AFB, NB.
- C.
Air Force Weather Agency, Offutt AFB, NB, and NOAA Satellite Operations Control Center at Suitland, MD
- D.
Air Force Weather Agency Offutt AFB, NB, and Multi Purpose Satellite Operations Center, Offutt AFB, NB
Correct Answer
A. Environmental Satellite Operations Center at Schriever AFB, CO, and National Oceanographic and Atmospheric Administration (NOAA) Satellite Operations Control Center at Suitland, MD.Explanation
The correct answer is the Environmental Satellite Operations Center at Schriever AFB, CO, and National Oceanographic and Atmospheric Administration (NOAA) Satellite Operations Control Center at Suitland, MD. These two command and control nodes are responsible for managing and controlling the Air Force Satellite Control Network (AFSCN). They oversee the operations of environmental satellites and ensure the effective communication and control of these satellites.Rate this question:
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- 35.
The MARK IVB antennas can be located up to how many feet away from the processing area?
- A.
1000
- B.
1500
- C.
2500
- D.
3000
Correct Answer
B. 1500Explanation
The MARK IVB antennas can be located up to 1500 feet away from the processing area.Rate this question:
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- 36.
Which mission is the highest priority of the Defense Support Program (DSP)?
- A.
Theater Warning
- B.
US retaliatory strike
- C.
North American warning
- D.
Worldwide space launches
Correct Answer
C. North American warningExplanation
The highest priority mission of the Defense Support Program (DSP) is the North American warning. This mission involves detecting and providing early warning of any missile threats or attacks against North America. It is crucial to prioritize this mission as it ensures the safety and security of the continent by allowing for timely response and defense measures to be taken.Rate this question:
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- 37.
Which set of equipment represents the satellite readout station equipment group?
- A.
Radio frequency set and modulation system controller
- B.
Modulation interface equipment and transmit/receive set
- C.
Modulation interface equipment and modulation system controller
- D.
Radio frequency set, transmit/receiver set, and digital equipment set
Correct Answer
D. Radio frequency set, transmit/receiver set, and digital equipment setExplanation
The satellite readout station equipment group consists of the radio frequency set, transmit/receiver set, and digital equipment set. These three sets of equipment are required for receiving and transmitting signals from the satellite. The radio frequency set is responsible for receiving and processing the radio frequency signals, while the transmit/receiver set handles the transmission and reception of signals. The digital equipment set is used for processing and storing the digital data received from the satellite. Together, these equipment sets make up the satellite readout station equipment group.Rate this question:
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- 38.
What is the number of Global Positioning System (GPS) orbital planes?
- A.
4
- B.
5
- C.
6
- D.
7
Correct Answer
C. 6Explanation
The number of Global Positioning System (GPS) orbital planes is 6. The GPS system consists of a constellation of satellites that orbit the Earth. These satellites are divided into six equally spaced orbital planes, with each plane containing multiple satellites. This configuration ensures that there are always enough satellites in view from any location on Earth, allowing for accurate positioning and navigation.Rate this question:
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- 39.
Which military strategic and tactical relay (MILSTAR) capability is very different from previous military satellite communications (MILSATCOM) and commercial satellite communications systems?
- A.
Crosslinking
- B.
Crossbanding
- C.
Multi-service
- D.
Secure networking
Correct Answer
A. CrosslinkingExplanation
Crosslinking is the correct answer because it refers to the capability of a MILSTAR system to directly communicate with other MILSTAR satellites without the need for ground-based infrastructure. This is different from previous MILSATCOM and commercial satellite communication systems, which typically rely on ground stations to relay messages between satellites. Crosslinking allows for more efficient and secure communication among military satellites, enhancing their strategic and tactical capabilities.Rate this question:
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- 40.
Which element of the military strategic and tactical relay (MILSTAR) mission allocates communication resources?
- A.
Development
- B.
Planning
- C.
Support
- D.
Control
Correct Answer
B. PlanningExplanation
The element of the MILSTAR mission that allocates communication resources is planning. In order to effectively communicate and coordinate military operations, a detailed plan must be put in place to allocate the necessary communication resources. This involves determining the specific needs and requirements of the mission, as well as assigning and managing the available resources to ensure efficient and secure communication.Rate this question:
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- 41.
The military strategic and tactical relay (MILSTAR) satellite sends downlink communications transmissions at
- A.
Ultrahigh frequency (UHF) and super-high (SHF)
- B.
Extremely high frequency (EHF) only
- C.
UHF and EHF
- D.
UHF only
Correct Answer
A. Ultrahigh frequency (UHF) and super-high (SHF)Explanation
The MILSTAR satellite sends downlink communications transmissions at Ultrahigh frequency (UHF) and super-high (SHF). This means that it is capable of transmitting signals at both UHF and SHF frequencies. UHF frequencies are typically used for long-range communications, while SHF frequencies are used for shorter-range communications. By utilizing both UHF and SHF frequencies, the MILSTAR satellite can ensure reliable and efficient communication over varying distances.Rate this question:
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- 42.
Which military strategic and tactical relay (MILSTAR) antenna provides high gain, selective coverage of any ground station visible on the earth's surface within its own footprint?
- A.
Spot beam
- B.
Agile beam
- C.
Gimbaled dish
- D.
Earth coverage
Correct Answer
A. Spot beamExplanation
The correct answer is Spot beam. A spot beam antenna provides high gain and selective coverage of any ground station visible within its own footprint on the earth's surface. This means that it focuses its signal on a specific area or spot, allowing for efficient and targeted communication with ground stations.Rate this question:
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- 43.
Which satellite system provides Global Broadcast Services (GBS)?
- A.
Commercial L-band
- B.
Defense Meteorological
- C.
Global Positioning Satellite (GPS)
- D.
Ultra-high frequency (UHF) follow-on
Correct Answer
D. Ultra-high frequency (UHF) follow-onExplanation
The Ultra-high frequency (UHF) follow-on satellite system provides Global Broadcast Services (GBS).Rate this question:
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- 44.
How many ultrahigh frequencies (UHF) channel are available for each UHF Follow-On satellite?
- A.
19
- B.
29
- C.
39
- D.
49
Correct Answer
C. 39Explanation
Each UHF Follow-On satellite has 39 ultrahigh frequencies (UHF) channels available.Rate this question:
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- 45.
When considering the factor of service area for commercial satellite services, which description about Ku-band service is true?
- A.
Not worldwide, located primarily over land masses and highly populated areas
- B.
Not worldwide, located primarily over ocean areas and lowly populated areas
- C.
Worldwide between roughly 65 degrees North and 65 degrees South latitudes
- D.
Worldwide, located primarily over land masses and highly populated areas
Correct Answer
A. Not worldwide, located primarily over land masses and highly populated areasExplanation
Ku-band service for commercial satellite services is not worldwide, but it is primarily located over land masses and highly populated areas. This means that the coverage of Ku-band service is limited to specific regions where there is a higher demand for satellite communication services, such as urban areas and densely populated regions. It is not designed to cover remote or sparsely populated areas, or areas primarily consisting of ocean.Rate this question:
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- 46.
What services are not included in INMARSAT mobile satellite services (MSS)?
- A.
Iridium
- B.
Swift broadband
- C.
Fleet broadband (maritime)
- D.
Broadband Global Area Network (BGAN)
Correct Answer
A. IridiumExplanation
Iridium is not included in INMARSAT mobile satellite services (MSS).Rate this question:
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- 47.
Which commercial satellite communication system can offer true pole-to-pole global coverage?
- A.
International telecommunications Satellite organization (INTELSAT)
- B.
European Telecommunications Satellite Organization (EUTELSAT)
- C.
International Maritime Satellite Organization (INMARSAT)
- D.
Iridium
Correct Answer
D. IridiumExplanation
Iridium is the correct answer because it is the only commercial satellite communication system that can offer true pole-to-pole global coverage. This is possible because Iridium operates a network of 66 satellites in low Earth orbit, allowing for seamless coverage across the entire globe, including the polar regions. INTELSAT, EUTELSAT, and INMARSAT are also satellite communication organizations, but they do not provide the same level of global coverage as Iridium.Rate this question:
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- 48.
Where is the Inmarsat headquarters located
- A.
Fucino, Italy
- B.
Beijing, China
- C.
London, england
- D.
Lake Cowichan, Western Canada
Correct Answer
C. London, englandExplanation
The correct answer is London, England. Inmarsat is a British satellite telecommunications company, and it is headquartered in London. London is a major global city and a hub for many international businesses, making it a suitable location for the headquarters of a multinational company like Inmarsat.Rate this question:
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- 49.
Which type of communications is not normally provided through commercial wideband services?
- A.
Deployable video teleconferencing
- B.
Very small aperture terminal networks
- C.
Handheld satellite phone communications
- D.
International high-speed internet connectivity
Correct Answer
C. Handheld satellite phone communicationsExplanation
Handheld satellite phone communications are not normally provided through commercial wideband services. While commercial wideband services often offer high-speed internet connectivity, video teleconferencing, and very small aperture terminal (VSAT) networks, they typically do not provide handheld satellite phone communications. Handheld satellite phones typically require a dedicated satellite network and service provider to ensure reliable and global coverage for voice and data communication.Rate this question:
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- 50.
Which satellite company is specifically designed to interface with all current X-band terminals?
- A.
XTAR
- B.
Inmarsat
- C.
INTELSAT
- D.
EUTELSAT
Correct Answer
A. XTARExplanation
XTAR is the correct answer because it is a satellite company that is specifically designed to interface with all current X-band terminals. This means that XTAR satellites are capable of communicating with and providing services to X-band terminals, which are commonly used in military, government, and commercial applications.Rate this question:
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