3D1X3 CDC Volume 3 Ure

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Quizzes Created: 3 | Total Attempts: 4,675

Questions: 120 | Attempts: 1,127 | Updated: Mar 21, 2023

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Questions and Answers

1.

(401) When using space diversity, the AN/TRC-170 receive antenna spacing should be a minimum of
- A.
  
  10 wavelengths apart.
- B.
  
  25 wavelengths apart.
- C.
  
  50 wavelengths apart.
- D.
  
  100 wavelengths apart.
Correct Answer
C. 50 wavelengths apart.

Explanation
Space diversity is a technique used to improve the reliability of wireless communication by using multiple antennas spaced apart. The AN/TRC-170 receive antenna spacing should be a minimum of 50 wavelengths apart. This spacing ensures that the antennas receive independent signals, reducing the chances of both antennas being affected by the same interference or fading. By spacing the antennas at this distance, the system can effectively mitigate signal degradation and improve overall communication performance.

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2.

(401) Which type of diversity requires two antennas, two receivers, and two transmitters?
- A.
  
  Polarization.
- B.
  
  Crossband.
- C.
  
  Frequency.
- D.
  
  Space.
Correct Answer
A. Polarization.

Explanation
Polarization is the correct answer because it requires two antennas, two receivers, and two transmitters. Polarization refers to the orientation of the electromagnetic waves in an antenna. By using two antennas with different polarization orientations, signals can be transmitted and received simultaneously, increasing the diversity and improving the quality of the communication. Crossband refers to the use of different frequency bands, frequency refers to the specific frequency of the signal, and space refers to the spatial diversity using multiple antennas.

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3.

(401) In an AN/TRC-170 terminal, the quantity of digital group multiplexer units supplied and their application are
- A.
  
  Different in the V2 and V3 systems.
- B.
  
  Identical in the V2 and V3 systems.
- C.
  
  Dependent on the mission and number of channels.
- D.
  
  Dependent on the deployment of the technical control.
Correct Answer
B. Identical in the V2 and V3 systems.

Explanation
The correct answer is "identical in the V2 and V3 systems." This means that the quantity of digital group multiplexer units supplied and their application are the same in both the V2 and V3 systems. There is no difference between the two versions when it comes to the digital group multiplexer units.

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4.

(401) The MD-1026 digital data modem can interface up to four groups of
- A.
  
  Balanced non-return-to-zero (NRZ) signals.
- B.
  
  Conditioned diphase signals.
- C.
  
  Unbalanced NRZ signals.
- D.
  
  Isochronous signals.
Correct Answer
B. Conditioned dipHase signals.

Explanation
The MD-1026 digital data modem is capable of interfacing with conditioned diphase signals. This means that it can effectively communicate and exchange data with signals that have been conditioned and encoded using the diphase modulation technique. The modem is not designed to interface with balanced non-return-to-zero (NRZ) signals, unbalanced NRZ signals, or isochronous signals.

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5.

(401) Which type of encryption device does full-duplex encryption of AN/TRC-170's groups or supergroup mission traffic?
- A.
  
  KY-68 digital secure voice terminal/phone.
- B.
  
  KY-58 VINSON.
- C.
  
  KG-84 dedicated loop encryption device.
- D.
  
  KG-81 trunk encryption device.
Correct Answer
D. KG-81 trunk encryption device.

Explanation
The KG-81 trunk encryption device is the correct answer because it is specifically designed for full-duplex encryption of mission traffic in AN/TRC-170's groups or supergroup. The other options, such as KY-68, KY-58, and KG-84, are not mentioned to have this capability. Therefore, the KG-81 trunk encryption device is the most suitable choice for this scenario.

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6.

(401) Digital voice orderwire traffic that originates at the AN/TRC-170's voice orderwire control unit is encrypted by the
- A.
  
  KY-68 digital secure voice terminal/phone.
- B.
  
  KY-58 VINSON encryption device.
- C.
  
  KG-84 dedicated loop encryption device.
- D.
  
  KG-81 trunk encryption device.
Correct Answer
B. KY-58 VINSON encryption device.

Explanation
The correct answer is the KY-58 VINSON encryption device. This device is used to encrypt digital voice orderwire traffic that originates at the AN/TRC-170's voice orderwire control unit. The KY-58 VINSON encryption device is specifically designed for secure voice communications and ensures that the transmitted information remains confidential and protected from unauthorized access.

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7.

(401) Which jack field in the AN/TRC-170's baseband patch panel provides timing and data connections?
- A.
  
  Middle.
- B.
  
  Center.
- C.
  
  Upper.
- D.
  
  Lower.
Correct Answer
C. Upper.

Explanation
The upper jack field in the AN/TRC-170's baseband patch panel provides timing and data connections.

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8.

(401) The tropospheric scatter modem processes mission traffic at data rates of 128 through 4,096 Kbps in the
- A.
  
  512 Kbps data rate family.
- B.
  
  576 Kbps data rate family.
- C.
  
  1,024 Kbps data rate family.
- D.
  
  1,152 Kbps data rate family.
Correct Answer
A. 512 Kbps data rate family.

Explanation
The correct answer is 512 Kbps data rate family. This means that the tropospheric scatter modem is capable of processing mission traffic at data rates ranging from 128 Kbps to 4,096 Kbps within the 512 Kbps data rate family.

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9.

(401) Which unit in the AN/TRC-170 terminal contains the rubidium standard?
- A.
  
  Electrical frequency synthesizer.
- B.
  
  Frequency subsystem unit.
- C.
  
  Tropospheric scatter modem.
- D.
  
  Transmitter-amplifier converter.
Correct Answer
A. Electrical frequency synthesizer.

Explanation
The rubidium standard is contained in the electrical frequency synthesizer unit of the AN/TRC-170 terminal. The electrical frequency synthesizer is responsible for generating precise and stable frequencies for the terminal's operations.

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10.

(401) The quick reaction antenna for the V3 AN/TRC-170 terminal uses
- A.
  
  Two 6-foot-diameter, linearly dual-polarized antennas.
- B.
  
  Four 6-foot-diameter, linearly dual-polarized antennas.
- C.
  
  Two 9.5-foot-diameter, linearly dual-polarized antennas.
- D.
  
  Four 9.5-foot-diameter, linearly dual-polarized antennas.
Correct Answer
A. Two 6-foot-diameter, linearly dual-polarized antennas.

Explanation
The correct answer is two 6-foot-diameter, linearly dual-polarized antennas. This means that the quick reaction antenna for the V3 AN/TRC-170 terminal uses two antennas that are 6 feet in diameter and have dual polarization.

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11.

(402) The Tropo/Satellite Support Radio frequency coverage extends from
- 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 GHz.

Explanation
The correct answer is 14.4 to 15.25 GHz. This is because the Tropo/Satellite Support Radio frequency coverage extends to this range.

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12.

(402) The maximum distance a Tropo/Satellite Support Radio can operate with the 2-foot antenna is
- A.
  
  10 miles.
- B.
  
  25 miles.
- C.
  
  100 miles.
- D.
  
  250 miles.
Correct Answer
B. 25 miles.

Explanation
The correct answer is 25 miles. The maximum distance a Tropo/Satellite Support Radio can operate with a 2-foot antenna is 25 miles. This means that the radio can transmit and receive signals effectively within a radius of 25 miles using the given antenna.

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13.

(402) In the Tropo/Satellite Support Radio's baseband assembly, a 1-volt peak-to-peak input signal results in how much frequency deviation in the transmitter?
- A.
  
  +/- 4 MHz.
- B.
  
  Less than +/- 4 MHz.
- C.
  
  More than +/- 4 MHz.
- D.
  
  No signal deviation.
Correct Answer
A. +/- 4 MHz.

Explanation
A 1-volt peak-to-peak input signal in the Tropo/Satellite Support Radio's baseband assembly results in a frequency deviation of +/- 4 MHz in the transmitter.

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14.

(402) In the Tropo/Satellite Support Radio frequency assembly, what permits the transmitter and receiver to be connected to the same antenna?
- A.
  
  Circulator.
- B.
  
  Combiner.
- C.
  
  Coupler.
- D.
  
  Hybrid.
Correct Answer
A. Circulator.

Explanation
A circulator is a device that allows signals to travel in only one direction in a circuit. In the Tropo/Satellite Support Radio frequency assembly, the circulator permits the transmitter and receiver to be connected to the same antenna by directing the signals from the transmitter to the antenna and the signals from the antenna to the receiver. This ensures that the transmitter and receiver do not interfere with each other and allows for efficient use of the antenna.

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15.

(402) What is the intermediate frequency of the Tropo/Satellite Support Radio?
- A.
  
  70 MHz with a 10 MHz bandpass.
- B.
  
  70 MHz with a 20 MHz bandpass.
- C.
  
  700 MHz with a 10 MHz bandpass.
- D.
  
  700 MHz with a 20 MHz bandpass.
Correct Answer
B. 70 MHz with a 20 MHz bandpass.

Explanation
The intermediate frequency of the Tropo/Satellite Support Radio is 70 MHz with a 20 MHz bandpass. This means that the radio receives signals at a frequency of 70 MHz and filters out unwanted frequencies using a bandpass filter with a width of 20 MHz. This allows the radio to focus on the desired signals and improve the overall performance and reception.

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16.

(403) The closest point of orbit that a satellite comes to the Earth is called the
- A.
  
  Apogee.
- B.
  
  Perigee.
- C.
  
  Major axis.
- D.
  
  Minor axis.
Correct Answer
B. Perigee.

Explanation
The correct answer is perigee. The question is asking for the term that refers to the closest point of orbit that a satellite comes to the Earth. The term perigee specifically refers to this point, while apogee refers to the farthest point of orbit. Major axis and minor axis are terms used in reference to the shape of an elliptical orbit and do not specifically describe the closest point of orbit. Therefore, the correct answer is perigee.

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17.

(403) What is the inclination angle of a polar orbit?
- A.
  
  0 degrees.
- B.
  
  45 degrees.
- C.
  
  90 degrees.
- D.
  
  180 degrees
Correct Answer
C. 90 degrees.

Explanation
A polar orbit is a type of orbit that goes over the Earth's poles, passing over both the North and South poles. In this type of orbit, the inclination angle is 90 degrees because the orbital plane is perpendicular to the equator. This means that the satellite or spacecraft will pass over the poles at each orbit. Therefore, the correct answer is 90 degrees.

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18.

(404) What are the two types of communications satellites?
- A.
  
  Active and passive.
- B.
  
  Active and real-time.
- C.
  
  Delay and passive.
- D.
  
  Delay and real-time.
Correct Answer
A. Active and passive.

Explanation
Communications satellites can be categorized into two types: active and passive. Active satellites are equipped with onboard electronics and systems that actively amplify and transmit signals. They have the ability to receive, process, and retransmit signals to different locations on Earth. On the other hand, passive satellites do not have any active components and rely on reflecting or redirecting signals. They simply bounce the received signals back to Earth without any amplification or processing. Therefore, the correct answer is active and passive.

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19.

(404) Which satellite reflects signals transmitted toward it?
- A.
  
  Active.
- B.
  
  Delay.
- C.
  
  Passive.
- D.
  
  Real-time.
Correct Answer
C. Passive.

Explanation
Passive satellites reflect signals transmitted toward them. Unlike active satellites that generate and transmit their own signals, passive satellites simply reflect or bounce back signals that are transmitted from the ground. These satellites do not have their own transmitters and rely on the signals they receive to be reflected back to the ground.

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20.

(404) An advantage of passive satellites is that they
- A.
  
  Have a larger transmitter power.
- B.
  
  Have more sensitive equipment.
- C.
  
  Operate as repeater stations in space.
- D.
  
  Operate over a wider-frequency range.
Correct Answer
D. Operate over a wider-frequency range.

Explanation
Passive satellites are able to operate over a wider-frequency range compared to active satellites. Passive satellites do not have their own power source or onboard electronics, which allows them to be more versatile in terms of the frequencies they can receive and transmit. They can reflect or redirect signals from other sources, making them suitable for various communication purposes. This advantage makes them valuable in applications such as telecommunications, weather monitoring, and scientific research.

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21.

(404) What is the time delay of a real-time satellite?
- A.
  
  0.1 seconds.
- B.
  
  0.6 seconds.
- C.
  
  1.0 seconds.
- D.
  
  6.0 seconds.
Correct Answer
B. 0.6 seconds.

Explanation
The time delay of a real-time satellite is 0.6 seconds. This means that there is a delay of 0.6 seconds between the transmission of a signal from the satellite and its reception on Earth. This delay is due to the time it takes for the signal to travel the distance between the satellite and Earth.

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22.

(405) What satellite access technique was the first multiple access method developed?
- 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
D. Frequency division multiple access (FDMA).

Explanation
FDMA was the first multiple access method developed. In FDMA, the available frequency spectrum is divided into multiple non-overlapping frequency bands, and each user is allocated a specific frequency band for communication. This allows multiple users to share the same physical medium by using different frequency bands.

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23.

(405) What 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 a satellite access technique where all channels are pooled and used by any station based on its instantaneous traffic load. This means that the channels are dynamically assigned to different stations based on their demand, allowing for efficient utilization of the available resources. CDMA, TDMA, and FDMA are not applicable in this scenario as they do not involve pooling and dynamic assignment of channels based on traffic load.

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24.

(406) When computing satellite look angles, ground distance on the earth's surface is expressed in
- A.
  
  Degrees.
- B.
  
  Seconds.
- C.
  
  Minutes.
- D.
  
  Nautical miles.
Correct Answer
A. Degrees.

Explanation
When computing satellite look angles, ground distance on the earth's surface is expressed in degrees. This is because look angles are used to determine the direction in which a satellite is viewed from a specific location on Earth's surface. The ground distance is measured in degrees of latitude and longitude, which are used to pinpoint a specific location on the Earth's surface. Therefore, expressing ground distance in degrees is the most appropriate unit of measurement for computing satellite look angles.

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25.

(406) One degree of arc on the Earth's surface equals
- A.
  
  One statute mile.
- B.
  
  One nautical mile.
- C.
  
  69 statute miles.
- D.
  
  69 nautical miles.
Correct Answer
C. 69 statute miles.

Explanation
One degree of arc on the Earth's surface equals 69 statute miles. This is a commonly used measurement in navigation and geography. The distance of one degree of arc varies depending on the latitude, but on average it is approximately 69 statute miles.

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26.

(407) Solar time is based on
- A.
  
  Atomic clock oscillations.
- B.
  
  Apparent constellation movement.
- C.
  
  The moon's rotation about the sun.
- D.
  
  The apparent motion of the sun in the sky.
Correct Answer
D. The apparent motion of the sun in the sky.

Explanation
Solar time is based on the apparent motion of the sun in the sky. Solar time is determined by the position of the sun relative to a specific location on Earth. As the Earth rotates on its axis, the sun appears to move across the sky, causing shadows to change direction. This motion of the sun is used to measure time, with each day divided into 24 hours based on the sun's apparent movement. This is different from atomic clock oscillations, which are used for precise timekeeping but do not directly relate to the sun's motion. The moon's rotation about the sun and apparent constellation movement are also not directly related to solar time.

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27.

(407) An atomic time scale is based on the frequency of which type of oscillator?
- A.
  
  Pendulum.
- B.
  
  Crystal.
- C.
  
  Quartz.
- D.
  
  Cesium.
Correct Answer
D. Cesium.

Explanation
An atomic time scale is based on the frequency of a cesium oscillator. Cesium atomic clocks are the most accurate and reliable timekeeping devices available. They work by measuring the vibrations of cesium atoms, which have a specific and constant frequency. This frequency is used as the basis for defining the unit of time, the second, and is used in various applications such as GPS navigation, telecommunications, and scientific research. Pendulum, crystal, and quartz oscillators are not used in atomic time scales as they are not as precise and stable as cesium oscillators.

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28.

(408) On what kind of clock system is coordinated universal time based?
- A.
  
  Amplitude modulation and pulse modulation.
- B.
  
  Daylight saving.
- C.
  
  24-hour.
- D.
  
  12-hour.
Correct Answer
C. 24-hour.

Explanation
Coordinated Universal Time (UTC) is based on a 24-hour clock system. This means that the day is divided into 24 equal parts, with each part representing one hour. This system is used worldwide to standardize timekeeping and ensure that everyone is on the same page when it comes to scheduling and coordinating events across different time zones. Unlike a 12-hour clock system, which repeats the numbers from 1 to 12 twice in a day, a 24-hour clock system uses numbers from 0 to 23 to represent the hours of the day.

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29.

(409) The international agency responsible for coordinated universal time (UTC) is the
- A.
  
  United States Naval Observatory.
- B.
  
  International Bureau of Weights and Measures.
- C.
  
  Precision Measurement Equipment Laboratory.
- D.
  
  National Institute of Standards and Technology.
Correct Answer
B. International Bureau of Weights and Measures.

Explanation
The International Bureau of Weights and Measures is responsible for coordinating universal time (UTC). This agency ensures that time is standardized and accurate across the globe. They work to maintain and improve the international time scale, which is essential for various scientific, technological, and practical applications. The United States Naval Observatory, Precision Measurement Equipment Laboratory, and National Institute of Standards and Technology may be involved in timekeeping and measurement, but they are not specifically responsible for coordinating universal time.

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30.

(409) Uploading satellite control data, tracking ballistic missiles, and predicting satellites tracking coordinates are examples of missions where all parties involved must have
- A.
  
  Identical time code formats.
- B.
  
  Different time code formats.
- C.
  
  Synchronized timing.
- D.
  
  Offset timing.
Correct Answer
C. Synchronized timing.

Explanation
In missions such as uploading satellite control data, tracking ballistic missiles, and predicting satellites tracking coordinates, it is crucial for all parties involved to have synchronized timing. This means that they all need to have their clocks set to the same time and be able to coordinate their actions based on this shared time reference. Having synchronized timing ensures that all parties are working with the same time code formats, allowing for accurate and coordinated operations.

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31.

(410) What two factors cause a quartz oscillator's resonant frequency 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 aging.

Explanation
The resonant frequency of a quartz oscillator can drift due to temperature changes and aging. Temperature affects the physical properties of the quartz crystal, causing its resonant frequency to change. Aging refers to the gradual degradation of the crystal over time, which can also cause a drift in the resonant frequency. Humidity and operating frequency are not mentioned as factors that directly cause the drift in the resonant frequency of a quartz oscillator.

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32.

(410) 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 frequency.

Explanation
The correct answer is "atoms release energy at a particular resonant frequency." Atomic clocks work by measuring the vibrations or oscillations of atoms, which occur at a specific frequency. These vibrations are very stable and consistent, allowing atomic clocks to accurately measure time. By counting the number of vibrations that occur within a given period, the atomic clock can determine the precise passage of time. This is why atomic clocks are considered one of the most accurate timekeeping devices available.

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33.

(411) Which type of modem transmits RF signals over coaxial cable?
- A.
  
  Voice.
- B.
  
  Cable.
- C.
  
  Radio.
- D.
  
  Wireless.
Correct Answer
B. Cable.

Explanation
The correct answer is "Cable" because a cable modem is specifically designed to transmit RF signals over coaxial cable. This type of modem is commonly used for internet connectivity, allowing users to access the internet through their cable television lines. Unlike other modems, a cable modem utilizes the existing cable infrastructure to transmit and receive data, providing a high-speed internet connection.

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34.

(412) 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 signals for transmission over a single transmission path.
- D.
  
  Combining multiple signals for transmission over separate, individial transmission paths.
Correct Answer
C. Combining multiple signals for transmission over a single transmission path.

Explanation
Multiplexing refers to the process of combining multiple signals into a single transmission path. This allows for efficient use of the available bandwidth and maximizes the utilization of the transmission medium. By multiplexing, multiple signals can be transmitted simultaneously over a single transmission path, which reduces the cost and complexity of the communication system.

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35.

(412) What technique of multiplexing samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?
- A.
  
  Wavelength division.
- B.
  
  Frequency division.
- C.
  
  Code division.
- D.
  
  Time division.
Correct Answer
D. Time division.

Explanation
Time division multiplexing (TDM) is a technique that samples each low-speed channel in sequence, interweaves the bits or characters, and then transmits them at a high speed. This is achieved by dividing the transmission time into small time slots and assigning each low-speed channel to a specific time slot. By doing so, multiple channels can share the same transmission medium without interfering with each other. Therefore, the correct answer is time division.

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36.

(412) Wavelength division multiplexing assigns each incoming optical signal to a specific
- A.
  
  Pseudorandom code.
- B.
  
  Frequency of light.
- C.
  
  Radio frequency.
- D.
  
  Time slot.
Correct Answer
B. Frequency of light.

Explanation
Wavelength division multiplexing (WDM) is a technique used in optical communication systems to transmit multiple signals simultaneously over a single optical fiber. It works by assigning each incoming optical signal to a specific frequency of light. This allows multiple signals to be transmitted and received at the same time without interfering with each other. Therefore, the correct answer is frequency of light.

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37.

(413) What comprises a telemetry data stream?
- A.
  
  Mission data and mission satellite health and status data.
- B.
  
  Command data and mission satellite health and status data.
- C.
  
  Mission data, satellite ephemeris, table, and satellite status data.
- D.
  
  Command data, satellite ephemeris table, and satellite status data.
Correct Answer
A. Mission data and mission satellite health and status data.

Explanation
A telemetry data stream comprises mission data and mission satellite health and status data. This means that the stream includes information related to the mission objectives as well as the health and status of the satellite being used for the mission. This data is crucial for monitoring and analyzing the performance of the satellite and ensuring the success of the mission.

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38.

(413) On a satellite, position and orientation control is especially critical for what type of antenna?
- A.
  
  Broadband.
- B.
  
  Wide angle.
- C.
  
  High frequency.
- D.
  
  Highly directional.
Correct Answer
D. Highly directional.

Explanation
On a satellite, position and orientation control is especially critical for highly directional antennas. This is because highly directional antennas require precise pointing towards the desired target in order to achieve optimal signal strength and quality. Any deviation in position or orientation can result in a loss of signal or interference, making position and orientation control crucial for highly directional antennas on satellites.

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39.

(414) The function of the command and control (C2) segment of the space systems is to
- A.
  
  Provide downlink informatino and recover the payload and health and status data.
- B.
  
  Maintain the satellite health and status and recover the payload and health and status data.
- C.
  
  Provide downlink information and recover the payload and the area of coverage require by the program mission.
- D.
  
  Maintain the satellite health and status and recover the payload and the area of coverage required by the program mission.
Correct Answer
B. Maintain the satellite health and status and recover the payload and health and status data.

Explanation
The function of the command and control (C2) segment of the space systems is to maintain the satellite health and status and recover the payload and health and status data. This means that the C2 segment is responsible for monitoring and managing the overall health and status of the satellite, as well as retrieving important data regarding the payload and its health and status. It is crucial for the C2 segment to ensure that the satellite is functioning properly and to collect necessary information for analysis and decision-making purposes.

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40.

(414) What type of command is sent to the satellite by the space systems mission control complex and contains embedded timing that specifies the time the satellite will execute the command?
- A.
  
  Real-time.
- B.
  
  Time-delayed.
- C.
  
  Timed program.
- D.
  
  Stored program.
Correct Answer
D. Stored program.

Explanation
A stored program is a type of command sent to the satellite by the space systems mission control complex. This command contains embedded timing that specifies the time the satellite will execute the command. This means that the command is stored in the satellite's memory and executed at a specific predetermined time.

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41.

(415) What is the purpose of the space system user segment?
- A.
  
  Receive, process, use, or distribute mission data as required by a program's taskings.
- B.
  
  Receive, process, use, or distribute payload data and provide essential space support tasks as required by a program's tasking.
- C.
  
  Transmit, process, use, or distribute mission data as required by a program's tasking.
- D.
  
  Transmit, process, use, or distribute payload data and provide essential space support tasks as required by a program's tasking.
Correct Answer
A. Receive, process, use, or distribute mission data as required by a program's taskings.

Explanation
The purpose of the space system user segment is to receive, process, use, or distribute mission data as required by a program's taskings. This means that the user segment is responsible for handling the data related to the mission objectives and making it available to the relevant parties. This could involve receiving data from various sources, processing it to extract meaningful information, using it for decision-making or analysis, and distributing it to other segments or users as needed. The user segment plays a crucial role in ensuring that the mission data is effectively utilized to achieve the program's goals.

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42.

(415) The two major subdivisions of the Defense Meteorological Satellite Program user segment are
- A.
  
  Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center and tactical terminals.
- B.
  
  Air Force Weather Agency and Fleet Numerical Meteorology Oceanography Center only.
- C.
  
  Air Force Weather Agency and National Oceanographic Atmospheric Administration.
- D.
  
  Fleet Numberical Meteorology Oceanography Center and National Oceanographic Atmospheric Administration and tactical terminals.
Correct Answer
A. Air Force Weather Agency and the Fleet Numerical Meteorology OceanograpHy Center and tactical terminals.

Explanation
The correct answer is Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center and tactical terminals. This answer accurately identifies the two major subdivisions of the Defense Meteorological Satellite Program user segment. The Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center are both responsible for providing weather and oceanographic information to support military operations. Additionally, tactical terminals are included as part of the user segment to facilitate the dissemination of this information to users in the field.

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43.

(415) Which early warning center receives Defense Support Program warning data from the 460th Space Wing units?
- A.
  
  Air Force Weather Agency.
- B.
  
  Mission Control Squadron.
- C.
  
  Mission Control Command.
- D.
  
  North American Aerospace Defense Command.
Correct Answer
D. North American Aerospace Defense Command.

Explanation
The North American Aerospace Defense Command (NORAD) receives Defense Support Program warning data from the 460th Space Wing units. NORAD is responsible for aerospace warning and control, and it operates a network of sensors and satellites to detect and track potential threats to North America. The 460th Space Wing units provide early warning of missile launches and other space-related activities. Therefore, it is logical that NORAD would receive warning data from these units to fulfill its mission of defending North American airspace.

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44.

(415) For an operational mission, the purpose of the global positioning system user segment is to enable users to
- A.
  
  Actively receive satellite broadcast position, velocity, and time data.
- B.
  
  Actively transmit satellite broadcast position, velocity, and time data.
- C.
  
  Passively receive satellite broadcast position, velocity, and time data.
- D.
  
  Passively transmit satellite broadcast position, velocity, and time data.
Correct Answer
C. Passively receive satellite broadcast position, velocity, and time data.

Explanation
The purpose of the global positioning system user segment is to enable users to passively receive satellite broadcast position, velocity, and time data. This means that users do not actively transmit any data, but rather receive the satellite broadcast data that provides them with information about their position, velocity, and time.

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45.

(415) What system supports the National Command Authority and provides all-service (Army, Navy, and Air Force) communication for interoperable command, control, and communications (C3) at all levels of conflict?
- A.
  
  Defense Satellite Communications System.
- B.
  
  Global Positioning System.
- C.
  
  Defense Support Program.
- D.
  
  Milstar.
Correct Answer
D. Milstar.

Explanation
Milstar is the correct answer because it is a system that supports the National Command Authority and provides all-service communication for interoperable command, control, and communications (C3) at all levels of conflict. The Defense Satellite Communications System, Global Positioning System, and Defense Support Program are not specifically designed for this purpose.

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46.

(416) What sequence of events must you follow when establishing a communication link with a satellite?
- A.
  
  Frequency acquisition, space 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 tracking.
47.

(416) Telemetry refers to
- A.
  
  A low power signal transmitted from the satellite and is separate from the communications components.
- B.
  
  A low power signal transmitted from the satellite and is part of the communications components.
- C.
  
  The data transmitted by the satellite concerning on-board status and is separate from the communications components.
- D.
  
  The data transmitted by the satellite concerning on-board status and is part of the communications components.
Correct Answer
C. The data transmitted by the satellite concerning on-board status and is separate from the communications components.

Explanation
Telemetry refers to the data transmitted by the satellite concerning on-board status and is separate from the communications components. This means that telemetry is a separate signal from the communication components and is specifically used to transmit data about the satellite's on-board status.

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48.

(416) Information contained in the ephemeris data pertain to the
- A.
  
  Predicted satellite orbit.
- B.
  
  Predicted atmospheric conditions.
- C.
  
  Channels through a satellite that are available for use.
- D.
  
  Combinations of ground stations that can communicate with each other.
Correct Answer
A. Predicted satellite orbit.

Explanation
The ephemeris data contains information about the predicted satellite orbit. This means that it provides details about the satellite's position and trajectory in space. By using this data, scientists and engineers can accurately track and predict the satellite's movement, allowing for precise calculations and planning of satellite operations and communications.

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49.

(416) Which tracking method requires no input from a satellite?
- A.
  
  Programmed track.
- B.
  
  Automatic track.
- C.
  
  Pseudoconscan.
- D.
  
  Step track.
Correct Answer
A. Programmed track.

Explanation
Programmed track is a tracking method that does not require any input from a satellite. It involves pre-programming the desired path or trajectory into the tracking system, and the system then follows this programmed track without the need for continuous satellite input. This method is often used in situations where satellite communication may be limited or unavailable, such as in remote or isolated areas.

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50.

(416) Automatic tracking systems are superior to programmed tracking systems because they
- A.
  
  Use servomechanisms to control antenna movements.
- B.
  
  Track only signals received from the satellite.
- C.
  
  Track the actual position of the satellite.
- D.
  
  Use updated ephemeris data.
Correct Answer
B. Track only signals received from the satellite.

Explanation
Automatic tracking systems are superior to programmed tracking systems because they track only signals received from the satellite. This means that the automatic tracking system is able to accurately follow the satellite's movements and adjust the antenna accordingly, ensuring a more precise and reliable tracking. In contrast, programmed tracking systems may rely on pre-determined instructions or data, which may not always accurately reflect the actual position of the satellite. Therefore, by tracking only the signals received from the satellite, automatic tracking systems are able to provide more accurate and up-to-date tracking information.

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Current Version
Mar 21, 2023

Quiz Edited by
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Jul 21, 2011

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3D1X3 CDC Volume 3 Ure

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(402) The Tropo/Satellite Support Radio frequency coverage extends from

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(402) In the Tropo/Satellite Support Radio frequency assembly, what permits the transmitter and receiver to be connected to the same antenna?

(402) What is the intermediate frequency of the Tropo/Satellite Support Radio?

(403) The closest point of orbit that a satellite comes to the Earth is called the

(403) What is the inclination angle of a polar orbit?

(404) What are the two types of communications satellites?

(404) Which satellite reflects signals transmitted toward it?

(404) An advantage of passive satellites is that they

(404) What is the time delay of a real-time satellite?

(405) What satellite access technique was the first multiple access method developed?

(405) What satellite access technique is being used when all channels are pooled and used by any station, according to its instantaneous traffic load?

(406) When computing satellite look angles, ground distance on the earth's surface is expressed in

(406) One degree of arc on the Earth's surface equals

(407) Solar time is based on

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(408) On what kind of clock system is coordinated universal time based?

(409) The international agency responsible for coordinated universal time (UTC) is the

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(410) What two factors cause a quartz oscillator's resonant frequency to drift?

(410) The operation of the atomic clock is based on the phenomenon that

(411) Which type of modem transmits RF signals over coaxial cable?

(412) What is multiplexing?

(412) What technique of multiplexing samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?

(412) Wavelength division multiplexing assigns each incoming optical signal to a specific

(413) What comprises a telemetry data stream?

(413) On a satellite, position and orientation control is especially critical for what type of antenna?

(414) The function of the command and control (C2) segment of the space systems is to

(414) What type of command is sent to the satellite by the space systems mission control complex and contains embedded timing that specifies the time the satellite will execute the command?

(415) What is the purpose of the space system user segment?

(415) The two major subdivisions of the Defense Meteorological Satellite Program user segment are

(415) Which early warning center receives Defense Support Program warning data from the 460th Space Wing units?

(415) For an operational mission, the purpose of the global positioning system user segment is to enable users to

(415) What system supports the National Command Authority and provides all-service (Army, Navy, and Air Force) communication for interoperable command, control, and communications (C3) at all levels of conflict?

(416) What sequence of events must you follow when establishing a communication link with a satellite?

(416) Telemetry refers to

(416) Information contained in the ephemeris data pertain to the

(416) Which tracking method requires no input from a satellite?

(416) Automatic tracking systems are superior to programmed tracking systems because they