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Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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RF Cafe Quiz #43
All RF Cafe Quizzes make great fodder for
employment interviews for technicians or engineers - particularly those who are
fresh out of school or are relatively new to the work world. Come to think of it,
they would make equally excellent study material for the same persons who are going
to be interviewed for a job. Bonne chance, Viel Glück, がんばろう,
buena suerte, удачи, in bocca al lupo, 행운을 빕니다,
ádh mór, בהצלחה, lykke til, 祝你好運.
Well, you know what I mean: Good luck!
Click here for the complete list of
RF Cafe Quizzes.
Note: Some material based on books have
quiz is based on the information presented in Plasma Antennas, by Theodore Anderson.
Note: Some of these books are available as prizes in the monthly
RF Cafe Giveaway.
1. When the frequency of operation of a plasma antenna decreases, what is the
corresponding requirement for plasma density?
a) Plasma density must increase
b) Plasma density
remains the same
c) Plasma density must decrease
d) Plasma density not a factor
How does plasma density affect signal phase during reflection and/or refraction?
a) Plasma density
affected only during reflection
b) Plasma density affected only during refraction
c) Plasma density
affected by both reflection and refraction
d) Plasma density does not affect phase
How is characteristic impedance controlled in a plasma antenna?
a) By varying the plasma density
varying the plasma material
c) By varying the plasma geometry
d) All the above
4. What commonly available component is useful as a plasma antenna demonstrator?
a) Fluorescent bulb
b) Neon bulb
c) Microwave oven
d) Lava lamp
5. What is plasma, by the way?
a) A biological gel
b) An ionized gas
d) Energetic electrons
6. In a multiple frequency nested
plasma antenna, where is the highest frequency antenna element located relative to the lowest frequency antenna
a) Lowest frequency element on the inside, highest frequency element on the outside
b) Lowest frequency element on the outside, highest frequency element on the inside
c) Element location
independent of frequency
d) Plasma antennas are only single frequency structures
What is plasma "windowing?"
a) Creating electronically switched portal regions around an antenna array
b) Opening or closing the plasma antenna feedline
c) Varying the Anderson ratio and/or Pella factor of the
d) Using the Windows operating system to control a plasma antenna
8. What is a "smart" plasma antenna?
a) A plasma antenna that uses higher order
b) Lab slang for a plasma antenna that uses a dummy load
c) 2nd generation plasma
d) A plasma antenna that use adaptive techniques to control beam patterns
9. How can plasma materials be used to provide filtering?
a) Plasmas are
frequency independent, and therefore not useful as filters
b) Layering regions of plasmas allows specific
frequencies to be selected and others rejected
c) Plasmas cannot be controlled well enough for use as
d) Structures are too large for use as practical filtering elements
10. Who is undoubtedly the master of using commercial fluorescent tubes for constructing plasma devices
like antennas, filters, and switches?
a) Theodore Anderson
b) General Electric
c) Richard Sylvania
d) Douglas Philips
Need some help? Click here for the
answers and explanations.
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