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True or False
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1
A primary solution to the problem of an overcrowded frequency spectrum and the need to carry wider-bandwidth video and digital information has been to move more radio communication to the microwave range.
A)True
B)False
2
Microwaves are ultrahigh, superhigh, and extremely high frequencies directly above the lower frequency ranges where most radio communication now takes place.
A)True
B)False
3
A modulated carrier occupies a certain amount of bandwidth called a channel.
A)True
B)False
4
Narrow bandwidths make it possible to use various multiplexing techniques to transmit more information.
A)True
B)False
5
Microwave signals do not travel in perfectly straight lines.
A)True
B)False
6
Once a received microwave signal is received by way of an antenna, it is coupled through tuned circuits and back to the antenna.
A)True
B)False
7
At higher microwave frequencies, C band and upward, a waveguide is used for the transmission line.
A)True
B)False
8
Special microwave coaxial cable called hard line can be used on the higher microwave bands.
A)True
B)False
9
The primary differences between standard lower-frequency transistors and microwave types are internal geometry and packaging.
A)True
B)False
10
Most microwave amplifiers are designed to have input and output impedances of 50 Ω.
A)True
B)False
11
A widely used microwave tube is the magnavox which is a combination of a simple diode vacuum tube with built-in cavity resonators.
A)True
B)False
12
A versatile microwave RF power amplifier known as the traveling-wave tube can generate hundreds and even thousands of microwave power.
A)True
B)False
13
Gyrotrons, which are built and operated as klystrons, are used for amplification at microwave frequencies above 30 GHz.
A)True
B)False
14
Most large earth-station antennas use a Cassegrain feed arrangement.
A)True
B)False
15
A parabolic reflector is a large dish-shaped structure made of metal or screen mesh.
A)True
B)False





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