CDC 3d153 volume 2 v2 (april 2013)

100 Questions  I  By Mmikhaylevskiy
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CDC 3D153 01 1206, Edit Code 02 (April 2013) Volume 2 Units 1-5 Unit 1: Antenna Theory Unit 2: Electromagnetic Wave Theory Unit 3: Transmission Security Techniques, Data Linking Concepts and Jam-Resistant Communications Unit 4: Other RF Transmission Systems Unit 5: High Frequency Communications

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1.  What is the primary transmission path for frequencies in the super high/extremely high frequency range?
A.
B.
C.
D.
2.  Areas in which no antenna radiation pattern passes through are called
A.
B.
C.
D.
3.  If a transmission line is terminated in an open, what will likely result?
A.
B.
C.
D.
4.  What Air Force instruction (AFI) requires communications squadrons to maintain “installation warning systems”?
A.
B.
C.
D.
5.  Which multiple channel access method eliminates the requirement for a net control station in the joint tactical information distribution system?
A.
B.
C.
D.
6.  Which of the following CANNOT be performed by the transceiver’s computerized components and micro-circuitry?
A.
B.
C.
D.
7.  What is the maximum power of the AN/PRC–150 in FM mode?
A.
B.
C.
D.
8.  Which statement concerning waveguides is FALSE?
A.
B.
C.
D.
9.  Sunspots occur on an
A.
B.
C.
D.
10.  Who has the ability to patch different talkgroups together?
A.
B.
C.
D.
11.  Which antenna type is usually used on long-range, point-to-point communication where the concentrated radio energy is needed for circuit reliability?
A.
B.
C.
D.
12.  How many talkgroups can a trunked mobile radio monitor at one time?
A.
B.
C.
D.
13.  Scientist call the ionosphere an extension of the
A.
B.
C.
D.
14.  A dipole or long-wire antenna is an example of a
A.
B.
C.
D.
15.  Name the process of unscrambling the encrypted information so that it is intelligible.
A.
B.
C.
D.
16.  If the electric field component travels in a plane perpendicular to the Earth’s surface, the radio wave is considered to be polarized
A.
B.
C.
D.
17.  What commonly referred link is the joint tactical information distribution system?
A.
B.
C.
D.
18.  What two properties of a transmission line determine its characteristic impedance?
A.
B.
C.
D.
19.  In dealing with sky/ground wave propagation, the area of silence where no signals are received is known as the
A.
B.
C.
D.
20.  Resistance of the conductor material in a transmission line leads to which type of loss?
A.
B.
C.
D.
21.  Line of sight radio waves that are guided through the air between two layers of the atmosphere are known as
A.
B.
C.
D.
22.  Sky wave transmission is used for which type of communications?
A.
B.
C.
D.
23.  What permits communication in shadow regions behind obstacles?
A.
B.
C.
D.
24.  What does the overall effectiveness of an entire transmitting and receiving system depend largely upon?
A.
B.
C.
D.
25.  The ability of an antenna to both receive and transmit equally well is known as the antenna’s
A.
B.
C.
D.
26.  Which basic field detaches from the antenna and travels through space at great distances?
A.
B.
C.
D.
27.  What frequency bands does the MILSTAR satellite system uses?
A.
B.
C.
D.
28.  Super high/extremely high frequency range is limited to
A.
B.
C.
D.
29.  Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a
A.
B.
C.
D.
30.  The family of radios that are scaled for use in all domains, will function with programmable waveforms, and be based on a common core architecture is the
A.
B.
C.
D.
31.  Radio waves that travel near the earth’s surface are called
A.
B.
C.
D.
32.  Examples of electronic protection includes all of the following EXCEPT
A.
B.
C.
D.
33.  In frequency hopping operation, the interval at which each transmitter remains on a given frequency for a specific time is known as
A.
B.
C.
D.
34.  The common name for the method of changing the encryption keys over the radio channel in a two-way radio system is called
A.
B.
C.
D.
35.  How many selectable traffic key slots does the KG–84A have?
A.
B.
C.
D.
36.  What occurs when high-energy ultraviolet light waves from the sun enter the ionospheric region of the atmosphere and strike the gas atoms?
A.
B.
C.
D.
37.  Which environment area will increase maintenance problems with dust and sand?
A.
B.
C.
D.
38.  What U.S. government agency divides the radio frequency spectrum into different bands?
A.
B.
C.
D.
39.  In the Whelen siren cabinet, what controls signal routing and power distribution of the system?
A.
B.
C.
D.
40.  The earth’s conductivity is determined by the type of
A.
B.
C.
D.
41.  A long-wire’s takeoff angle depends on the antenna’s
A.
B.
C.
D.
42.  In the Whelen system, how many digits make up the dual tone multi frequency (DTMF) protocol.
A.
B.
C.
D.
43.  Radio sets are left on 24-hours a day in a jungle environment to
A.
B.
C.
D.
44.  In HF communications, by replacing the vertical antenna with a dipole antenna that’s a quarter wavelength off the ground, what are you able to get from your antenna transmission?
A.
B.
C.
D.
45.  What are the three part data handshake between calling and receiving stations?
A.
B.
C.
D.
46.  At what point do magnetic fields around a wire no longer have time to collapse completely between alternations?
A.
B.
C.
D.
47.  How many programmable devices can the multi-band inter/intra team radio hold?
A.
B.
C.
D.
48.  The refractive index of air depends on moisture,
A.
B.
C.
D.
49.  What is one of the simplest and most functional antennas in use?
A.
B.
C.
D.
50.  Transmitting a signal on a particular frequency in order to determine that channel’s usability is referred to as
A.
B.
C.
D.
51.  Which switch on the KY–57 VINSON zeroizes channels one through five?
A.
B.
C.
D.
52.  Which conventional land mobile radio device serves as the hub of a net?
A.
B.
C.
D.
53.  In HF communications, the lowest frequency that arrives at the distant receiver on 90 percent of the undisturbed days of the month is called the
A.
B.
C.
D.
54.  When comparing the radio and optical horizons, which one is farther away and by what percent?
A.
B.
C.
D.
55.  What measurement is used to determine whether an antenna is resonant at a particular frequency?
A.
B.
C.
D.
56.  From what source does the RT–1523 SINCGARS radio’s control module obtain instructions during remote and local operation respectively?
A.
B.
C.
D.
57.  The main very high frequency/ultra high frequency communications emphasis is on
A.
B.
C.
D.
58.  What frequency range will show little effect from precipitation?
A.
B.
C.
D.
59.  What identifies the output power of the AN/GRC–171B(V)4 transceiver?
A.
B.
C.
D.
60.  Radio waves that angled too low are
A.
B.
C.
D.
61.  In siting a radio station, which foliage would have more of an adverse effect on radio wave propagation?
A.
B.
C.
D.
62.  Sunspots are disturbances
A.
B.
C.
D.
63.  What is probably the worst antenna that can be used on sky-wave circuits?
A.
B.
C.
D.
64.  Which type of airborne antenna can be designed into any part of an aerospace vehicle’s surface, so that it does not upset its aerodynamic properties?
A.
B.
C.
D.
65.  The ability to reproduce the input signal accurately is the characteristics of the receiver’s
A.
B.
C.
D.
66.  What type of network radio does the Air Force use for close air support?
A.
B.
C.
D.
67.  The concept that alternating current changes in magnitude and reverses its direction during each cycle is
A.
B.
C.
D.
68.  Using figure 1–10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.
A.
B.
C.
D.
69.  In mountainous terrain, with a mountain between you and the distant end, which of these antennas is more effective?
A.
B.
C.
D.
70.  Concerning HAVE QUICK II communications multiple word-of-day (MWOD), how long can each word-of-day (WOD) be used?
A.
B.
C.
D.
71.  A transmission line that consists of a center conductor placed inside a rigid metal tube functioning as the outer tube is called a
A.
B.
C.
D.
72.  How many regions make up the atmosphere?
A.
B.
C.
D.
73.  What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce a voltage in the antenna?
A.
B.
C.
D.
74.  Magneton splitting creates two waves called
A.
B.
C.
D.
75.  What has the greatest effect on an antenna?
A.
B.
C.
D.
76.  Which antenna radiates radio energy equally well in all directions?
A.
B.
C.
D.
77.  The ability of a receiver to reproduce the signal of a very weak station is the characteristic of the receiver’s
A.
B.
C.
D.
78.  What is the minimum length for a long-wire antenna?
A.
B.
C.
D.
79.  A nonresonant transmission line is a line
A.
B.
C.
D.
80.  What is the first step in electronic warfare application?
A.
B.
C.
D.
81.  The actual range of frequencies within the antenna’s bandwidth is called the
A.
B.
C.
D.
82.  What assembly on the AN/PRC–150 contains the keyboard and the liquid crystal display (LCD) that makes up the radio’s man-machine interface?
A.
B.
C.
D.
83.  What type of directivity does the whip antenna provide?
A.
B.
C.
D.
84.  The standard used to measure the radiating effectiveness (gain) of an antenna system is the
A.
B.
C.
D.
85.  A common satellite antenna is the
A.
B.
C.
D.
86.  A helical satellite antenna radiates a signal with what type of polarization?
A.
B.
C.
D.
87.  Near-vertical-incidence sky wave operations are most effective when you’re using
A.
B.
C.
D.
88.  The angle at which a radio wave enters the ionosphere is known as the
A.
B.
C.
D.
89.  Leakage loss in a transmission line can be minimized by using a
A.
B.
C.
D.
90.  Where do the modulation and digital-to-analog conversion take place in the AN/PRC– 150?
A.
B.
C.
D.
91.  In selecting an antenna for a circuit, what is the first thing to consider?
A.
B.
C.
D.
92.  What is a common problem with a mass alert system in a deployed environment?
A.
B.
C.
D.
93.  What antenna radiates or receives on many of its particular elements?
A.
B.
C.
D.
94.  Which statement is NOT a characteristic of the AN/GRC–171B(V)4 transceiver?
A.
B.
C.
D.
95.  Which electronic warfare component responds to taskings to search for, intercept, identify, and locate intentional and unintentional sources of radiated energy?
A.
B.
C.
D.
96.  Which environment would be considered the most challenging for an RF transmission systems technician to establish and operate a radio station from?
A.
B.
C.
D.
97.  Which frequency band is most susceptible to jamming?
A.
B.
C.
D.
98.  In high frequency communications, your station’s self address is the address
A.
B.
C.
D.
99.  Which statement concerning line lengths is TRUE?
A.
B.
C.
D.
100.  Equipment used for generating, amplifying, and transmitting RF carrier is collectively called
A.
B.
C.
D.
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