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make equally excellent study material for the same persons who are going to be interviewed
for a job.
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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 given volume.
3. Luminiferous aether
b) Medium that supports the transmission of light particles
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 deflogisticate means to render burnable. Oxygen supports combustion, hence the name.
d) Light particle
So-named by Isaac Newton.
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
b) Energy 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).
10. Voltaic pile
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 support structures.