3D1X3 Volume 3
Volume 3 of 3D1X3 (URE's)
- 1.
(401) In the tropospheric scatter mode, the high power amplifier amplifies the radio frequency to
- A.
1 milliwatt
- B.
1 watt
- C.
100 watt
- D.
1 kilowatt
Correct Answer
D. 1 kilowatt -
- 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 -
- 3.
(401) The MD–1026 digital data modem can interface up to four groups of, which type of signals?
- A.
Balanced non-return-to-zero (NRZ).
- B.
Conditioned diphase
- C.
Unbalanced NRZ
- D.
Isochronous
Correct Answer
B. Conditioned diphase -
- 4.
(401) The trunk group multiplexer TD–1236 can multiplex up to
- A.
One group of the 512 Kbps data rate family.
- B.
One group of the 576 Kbps data rate family.
- C.
Four groups of the 512 Kbps data rate families or 576 Kbps data rate families.
- D.
Four groups of the 12 Kbps data rate families and 576 Kbps data rate families.
Correct Answer
C. Four groups of the 512 Kbps data rate families or 576 Kbps data rate families. -
- 5.
(401) Digital voice orderwire traffic that originates at the AN/TRC–170’s voice orderwire control unit, is encrypted by the
- A.
KY–68.
- B.
KY–58
- C.
KG–84
- D.
KG–81
Correct Answer
B. KY–58 -
- 6.
(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 -
- 7.
(401) The tropospheric scatter modem processes mission traffic at data rates of 128 through 4,096 Kbps, within which data rate family?
- A.
512 Kbps
- B.
576 Kbps
- C.
1,024 Kbps
- D.
1,152 Kbps
Correct Answer
A. 512 Kbps -
- 8.
(401) Which unit in the AN/TRC–170 terminal contains the rubidium standard?
- A.
Electrical synthesizer
- B.
Frequency subsystem
- C.
Tropospheric scatter modem
- D.
Transmitter-amplifier converter
Correct Answer
C. Tropospheric scatter modem -
- 9.
(401) The quick reaction antenna for the V3 AN/TRC–170 terminal uses how many linearly dualpolarized antennas?
- A.
Two 6-foot-diameter.
- B.
Four 6-foot-diameter.
- C.
Two 9.5-foot-diameter.
- D.
Four 9.5-foot-diameter.
Correct Answer
A. Two 6-foot-diameter. -
- 10.
(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. -
- 11.
(402) Which maximum distance in miles can a Tropo/Satellite Support Radio operate with the 2- foot antenna?
- A.
9
- B.
24
- C.
90
- D.
240
Correct Answer
B. 24 -
- 12.
(402) What is the maximum distance in feet the Tropo/Satellite Support Radio’s radio frequency and baseband assemblies can be separated?
- A.
50
- B.
100
- C.
150
- D.
200
Correct Answer
C. 150 -
- 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. -
- 14.
(402) Which frequency 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. -
- 15.
(403) What is the inclination angle of a polar orbit?
- A.
0°
- B.
45°
- C.
90°
- D.
180°
Correct Answer
C. 90° -
- 16.
(403) What is the procedure called when keeping a satellite in a desired position, in orbit andwithin acceptable limits?
- A.
Shift
- B.
Period
- C.
Air drag
- D.
Station keeping
Correct Answer
D. Station keeping -
- 17.
(404) Which satellite reflects signals transmitted toward it?
- A.
Active
- B.
Delay
- C.
Passive
- D.
Real-time
Correct Answer
C. Passive -
- 18.
(404) An advantage of passive satellites is that they
- A.
Have a larger transmitter power
- B.
Have a larger antenna system
- C.
Have more sensitive equipment
- D.
Operate over a wider-frequency range
Correct Answer
D. Operate over a wider-frequency range -
- 19.
(404) What is the seconds delay of a real-time satellite?
- A.
0.1
- B.
0.6
- C.
1.0
- D.
6.0
Correct Answer
B. 0.6 -
- 20.
(405) Which 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). -
- 21.
(405) 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). -
- 22.
(406) To calculate look angles (e.g. antenna azimuth and elevation) from the ground terminal to the satellite, you need to know the terminal’s latitude and longitude, as well as the satellite’s latitude, longitude, and
- A.
Velocity
- B.
Height
- C.
Speed
- D.
Depth
Correct Answer
B. Height -
- 23.
(406) When computing satellite look angles, the ground distance on the earth’s surface is expressed in
- A.
Degrees
- B.
Seconds
- C.
Minutes
- D.
Nautical miles
Correct Answer
A. Degrees -
- 24.
(406) What does one degree of arc on the Earth’s surface equal?
- A.
One statute mile
- B.
One nautical mile
- C.
69 statute miles
- D.
69 nautical miles
Correct Answer
C. 69 statute miles -
- 25.
(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 -
- 26.
(407) An atomic time scale could be based on the frequency of what type of oscillator?
- A.
Pendulum
- B.
Crystal
- C.
Quartz
- D.
Cesium
Correct Answer
D. Cesium -
- 27.
(408) What kind of clock system is coordinated universal time (UTC) based?
- A.
12-hour
- B.
24-hour
- C.
Daylight saving
- D.
Amplitude modulation and pulse modulation
Correct Answer
B. 24-hour -
- 28.
(409) 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. Second -
- 29.
(409) 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 (NIST)
Correct Answer
B. International Bureau of Weights and Measures (BIPM) -
- 30.
(409) Uploading satellite control data, tracking missiles, and predicting satellite tracking coordinates are examples of missions where all parties involved must have
- A.
Offset timing.
- B.
Synchronized timing.
- C.
Identical time code formats.
- D.
Different time code formats.
Correct Answer
B. Synchronized timing. -
- 31.
(410) When any frequency source regardless of its accuracy or stability is used as the sole calibration reference for other frequency sources, what kind of standard is it?
- A.
First generation
- B.
Secondary
- C.
Primary
- D.
Class I
Correct Answer
C. Primary -
- 32.
(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 -
- 33.
(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 -
- 34.
(411) To send information over telephone lines, the modulator in a voice modem converts the
- A.
Audio signal into digital data.
- B.
Optical signal into digital data.
- C.
Digital data into an audio signal.
- D.
Digital data into an optical signal.
Correct Answer
C. Digital data into an audio signal. -
- 35.
(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, individual transmission paths.
Correct Answer
C. Combining multiple signals for transmission over a single transmission path. -
- 36.
(412) Which division technique of multiplexing, 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. Time -
- 37.
(412) 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 light -
- 38.
(413) What comprises a telemetry data stream?
- A.
Mission data, mission satellite health, and status data
- B.
Command data, 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, mission satellite health, and status data -
- 39.
(413) Stability is important to a satellite in the space environment. What does stability allow that makes it so important?
- A.
Payload to operate accurately and the satellite bus to receive commands and upload data reliably.
- B.
Payload to operate accurately and the satellite bus to receive uploaded inertial reference and data reliably.
- C.
Accelerometers to operate accurately and the satellite bus to receive commands and upload data reliably
- D.
Accelerometers to operate accurately and the satellite bus to receive uploaded inertial reference and data reliably.
Correct Answer
A. Payload to operate accurately and the satellite bus to receive commands and upload data reliably. -
- 40.
(413) On a satellite, position, and orientation control is especially critical for which type of antenna?
- A.
Broadband
- B.
Wide angle
- C.
High frequency
- D.
Highly directional
Correct Answer
D. Highly directional -
- 41.
(414) The purpose of satellite antenna pointing data is to
- A.
Update the mission satellite orbital database and ephemeris table
- B.
Update the mission satellite orbital database and satellite acquisition timing
- C.
Direct the servo positioning equipment to drive motors that position the antenna to specific acquisition angles
- D.
Direct the servo positioning equipment to position the antenna to specific acquisition angles, and command the ground equipment to execute autotracking
Correct Answer
C. Direct the servo positioning equipment to drive motors that position the antenna to specific acquisition angles -
- 42.
(414) This type of command, sent to the satellite by the space systems mission control complex, 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 -
- 43.
(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 tasking
- 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 tasking -
- 44.
(415) The two major subdivisions of the Defense Meteorological Satellite Program (DMSP) 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 Numerical 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 -
- 45.
(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 -
- 46.
(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 Support Program.
- B.
Global Positioning System
- C.
Military Strategic and Tactical Relay
- D.
Defense Satellite Communications System
Correct Answer
C. Military Strategic and Tactical Relay -
- 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 -
- 48.
(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 -
- 49.
(416) What signal originating from the satellite do we use to acquire and track the satellite?
- A.
Beacon
- B.
Ephemeris
- C.
Telemetry
- D.
Communication
Correct Answer
A. Beacon -
- 50.
(417) The intermediate frequencies/levels used by Defense Satellite Communications System (DSCS) earth terminals are 70 MHz at
- A.
–10 dBm and 630 MHz @ –13 dBm
- B.
–13 dBm and 630 MHz @ –10 dBm
- C.
–10 dBm and 700 MHz @ –13 dBm
- D.
–13 dBm and 700 MHz @ –10 dBm
Correct Answer
C. –10 dBm and 700 MHz @ –13 dBm -
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Dec 02, 2014Quiz Edited by
ProProfs Editorial Team -
Jul 08, 2013Quiz Created by
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