You might be an old time if you can answer the following, with out diving
into your library.

Which of the following is NOT a rectifier?
a. 3B24
b. 80
c. 3C24
d. 6H6

Steel wool was once touted as a good material to make which of the
following?

a. Choke Balun
b. AF shielding
c. Linear capacitors
d. Radials for short virticals

Feel free to add your own favorite...