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