Set 2 Vol 2 Communication
- 1.In a basic communication system, this is used to convert radio frequency (RF) current oscillation into electric and magnetic fields of force
- A.
Antenna
- B.
Transmitter
- C.
Coupler
- D.
Transmission lines
- 2.The concept where alternating current (AC) changes in magnitude, and reverses its direction during each cycle, is
- A.
An unproven hypothesis
- B.
The definition of propagation
- C.
What makes radio transmission possible
- D.
What led to the discovery of direct current (DC)
- 3.At which point do magnetic fields around a wire no longer have time to collapse completely between alternations?
- A.
60 cycles per second (cps)
- B.
120 cps
- C.
10,000 cps
- D.
15,000 cps
- 4.In radio-wave creation, which type of field detaches from the antenna and travels through space at great distances?
- A.
Radiation.
- B.
Induction
- C.
Gravitational
- D.
Electromotive
- 5.Which types of polarization do most satellite communication terminals transmit and receive?
- A.
Transmit horizontal and receive vertical polarizations
- B.
Transmit vertical and receive horizontal polarizations
- C.
Transmit right-hand circular and receive left-hand circular polarizations
- D.
Transmit left-hand circular and receive right-hand circular polarizations
- 6.A resonant antenna effectively radiates a radio signal for frequencies close to its designed frequency. Which percentage range, plus or minus, is it usually within?
- A.
1
- B.
2
- C.
3
- D.
4
- 7.The design frequency of a resonant antenna is 10 megahertz (MHz). What will be its frequency range?
- A.
8–10 MHz
- B.
9–11 MHz
- C.
9.5–10.5 MHz
- D.
9.8–10.2 MHz
- 8.The lowest frequency at which an antenna resonates is known as its
- A.
Standing wave
- B.
Fundamental
- C.
Resonation
- D.
Primary.
- 9.The ability of an antenna to both receive and transmit equally well is known as the antenna’s
- A.
Bandwidth
- B.
Resonance
- C.
Reciprocity
- D.
Effectiveness
- 10.This matching device is inserted to make a transmitter “think” it is connected to a low standing-wave ratio (SWR) antenna
- A.
Stub
- B.
Balun
- C.
Coupler
- D.
Terminating resistor
- 11.This matching device would be used to connect a 52-ohms RG–213 cable to an antenna with an impedance of 600-ohms.
- A.
Balun.
- B.
Coupler
- C.
Reflector
- D.
Terminating resistor
- 12.Which type of antenna radiates radio energy equally well in all directions?
- A.
Omni-directional
- B.
Uni-directional
- C.
Bi-directional
- D.
Directional
- 13.Add this device to make a long-wire antenna more directional
- A.
Stub
- B.
Balun
- C.
Coupler
- D.
Terminating resistor
- 14.Beam width of a directive antenna is measured at the
- A.
Quarter-power point
- B.
Half-power point
- C.
Three-quarters power point
- D.
Maximum value point
- 15.A dipole or long-wire antenna is an example of a
- A.
Whip antenna
- B.
Hertz antenna
- C.
Marconi antenna
- D.
Vertical monopole
- 16.This is one of the simplest and most functional antennas in use
- A.
Quarter-wave vertical
- B.
Half-wave dipole
- C.
Inverted-V
- D.
GRA–4
- 17.The minimum length of a long-wire antenna is
- A.
One-quarter wavelength
- B.
One-half wavelength
- C.
One wavelength
- D.
Two wavelengths
- 18.You should use this type of antenna to communicate over the horizon to an amphibious ship on the move or to a station up to 450 kilometers away
- A.
Near-vertical incidence sky-wave
- B.
Helical
- C.
Inverted-V
- D.
Inverted-L
- 19.How are most antennas designed that are used in satellite communications?
- A.
Circular-directional
- B.
Omni-directional
- C.
Bi-directional
- D.
Directional
- 20.Which type of polarization is used to radiate a signal using a helical satellite antenna?
- A.
Horizontal
- B.
Vertical
- C.
Circular
- D.
Linear
- 21.This type of antenna is used to transmit and receive microwave signals
- A.
Horn
- B.
Whip
- C.
Helical
- D.
Log-periodic
- 22.Where are aircraft antennas normally housed?
- A.
Inside nonconductive radomes outside or flush with the fuselage
- B.
Inside conductive radomes outside or flush with the fuselage
- C.
Outside nonconductive radomes outside the fuselage
- D.
Inside conductive radomes flush with the fuselage
- 23.At which vertical angles should the multi-hop, long-distance transmission be used in airborne antenna applications for frequencies in the upper portion of the high-frequency (HF) band?
- A.
90 and 180 degrees
- B.
60 and 90 degrees
- C.
30 and 60 degrees
- D.
5 and 30 degrees
- 24.This is the best way to orient line-of-sight (LOS) antennas
- A.
Toward the true north bearing
- B.
Away from the receiving station
- C.
Away from the magnetic north bearing
- D.
In a straight path to the receiving station
- 25.When siting a radio station, which type of foliage would have a more adverse effect on radio-wave propagation?
- A.
Broadleaf trees
- B.
Evergreen trees
- C.
Swamp grass
- D.
Sagebrush
Questions: 100 | Attempts: 34458 | Last updated: Mar 22, 2022
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Sample Question________can be defined as behavior and attitude patterns exhibiting standards and character marked by pride in oneself and one's career, respect for the people served, and commitment to the continued development of skills in the pursuit of excellence.
Questions: 30 | Attempts: 22885 | Last updated: Mar 22, 2022
-
Sample QuestionWhich of the following are essential elements of communication? (Select all that apply)
Questions: 10 | Attempts: 16893 | Last updated: Mar 22, 2022
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Sample QuestionWhich one of these is a form of verbal communication?
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