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.
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Note: Many answers contain passages quoted in whole or in part from the text.
Return to RF Cafe Quiz #18
1. Gutta percha
c) Cable insulation
Gutta percha is a natural form of rubber that was the
first successful insulation for undersea communications cables in the 19th century.
Condensers were so-called due to their ability to collect and "condense charges into a
3. Luminiferous aether
b) Medium that supports the transmission of light
As early as the days of Newton, it was believed that a special medium existed that accommodated the movement
of light particles (prior to their wave nature being discovered). That medium was dubbed luminiferous aether.
4. Thermionic valve
a) Vacuum tube diode
Thermionic comes from the boiling off of electrons
from the cathode, and valve, of course, derives from the devices' ability to switch current on or off.
5. Dephlogisticated air
d) Molecular oxygen
To deflogisticcate means to render burnable. Oxygen
supports combustion, hence the name.
d) Light particle
So-named by Isaac
c) Vacuum tube triode
Lee De Forest called his newly discovered
amplifying device an Audion (not sure why).
d) Fluid responsible for heat flow
It used to be thought that caloric was a fluid that transferred head from bodies of higher temperatures to bodies
of lower temperatures. Canon boring experiments debunked the belief.
9. Leyden jar
storage device (capacitor)
Benjamin Franklin used a Leyden jar as part of his kite flying experiment to
prove that lightning was a form of electricity (no he didn't "discover" electricity).
All four answers are proper definitions of a pile, but the one that fits the spirit of this
quiz is, of course, a battery. Alessandro Volta, inventor of the first practical wet-cell battery, so-named it
because it looked like a pile - a 5th definition for the word "pile" that means a long rod-like beam used to