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