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: 25357 | Last updated: May 3, 2021
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