1.
In a basic communication system, this is used to convert radio frequency (RF) current oscillation into electric and magnetic fields of force
A. 
B. 
C. 
D. 
2.
The concept where alternating current (AC) changes in magnitude, and reverses its direction during each cycle, is
A. 
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. 
C. 
D. 
4.
In radio-wave creation, which type of field detaches from the antenna and travels through space at great distances?
A. 
B. 
C. 
D. 
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. 
B. 
C. 
D. 
7.
The design frequency of a resonant antenna is 10 megahertz (MHz). What will be its frequency range?
A. 
B. 
C. 
D. 
8.
The lowest frequency at which an antenna resonates is known as its
A. 
B. 
C. 
D. 
9.
The ability of an antenna to both receive and transmit equally well is known as the antenna’s
A. 
B. 
C. 
D. 
10.
This matching device is inserted to make a transmitter “think” it is connected to a low standing-wave ratio (SWR) antenna
A. 
B. 
C. 
D. 
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. 
B. 
C. 
D. 
12.
Which type of antenna radiates radio energy equally well in all directions?
A. 
B. 
C. 
D. 
13.
Add this device to make a long-wire antenna more directional
A. 
B. 
C. 
D. 
14.
Beam width of a directive antenna is measured at the
A. 
B. 
C. 
Three-quarters power point
D. 
15.
A dipole or long-wire antenna is an example of a
A. 
B. 
C. 
D. 
16.
This is one of the simplest and most functional antennas in use
A. 
B. 
C. 
D. 
17.
The minimum length of a long-wire antenna is
A. 
B. 
C. 
D. 
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. 
C. 
D. 
19.
How are most antennas designed that are used in satellite communications?
A. 
B. 
C. 
D. 
20.
Which type of polarization is used to radiate a signal using a helical satellite antenna?
A. 
B. 
C. 
D. 
21.
This type of antenna is used to transmit and receive microwave signals
A. 
B. 
C. 
D. 
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. 
B. 
C. 
D. 
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. 
B. 
C. 
D.