All RF Cafe quizzes would make perfect 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.
Some of these books used in quizzes are available as prizes
in the monthly RF Cafe Giveaway.
Note: Many answers contain passages quoted from the text.
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
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 factor2.
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 phase3.
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
What commonly available component is useful as a plasma antenna demonstrator?
a) Fluorescent bulb
b) Neon bulb
c) Microwave oven
d) Lava lamp
What is plasma, by the way?
a) A biological gel
b) An ionized gas
d) Energetic electrons6.
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 structures7.
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
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
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
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.