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Electromagnetic Function Quiz
June 1964 Popular Electronics

June 1964 Popular Electronics

June 1964 Popular Electronics Cover - RF CafeTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

I scored a pathetic 80% on Robert Balin's Electromagnetic Function Quiz. It appeared in a 1964 issue of Popular Electronics magazine. There are ten drawings of electromagnetic devices and ten related terms for you to match. For the life of me, I could not figure out which drawing represented magnetostriction, which is the process of a material containing a magnetic field changing in physical length. I also wasn't sure what figure A was (hint: think about CRT TVs and monitors), and I wasn't able to confidently do a process of elimination. Oh well, hopefully you'll do better.

Electromagnetic Function Quiz

Electromagnetic Function Quiz, June 1964 Popular Electronics - RF CafeBy Robert P. Balin

Since 1820, when Oersted discovered the magnetic field around a current-carrying conductor, electromagnetism has found many uses in electronics. Can you match the functions of electromagnetism listed below (1-10) with the drawings of the corresponding devices (A-J)?

See answers at bottom of page.

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

 

 

Electromagnetic Function Quiz Answers 

1 - J   A relay employs the attractive force of electromagnetism to pull in its armature and thereby change the position of the contacts.

2 - C   In a radial-vane meter movement, two iron vanes positioned like the covers of a book are magnetized in the same way by the surrounding coil. The force of repulsion produced between them then causes the pivoted vane carrying the needle to be deflected.

3 - I   The toroidal cores in a memory plane are fully magnetized in a clockwise or counterclockwise direction by the coincidence of currents in the wires which are threaded through them.

4 - G   A degaussing coil energized by 60-cycle a.c. is used to remove unwanted magnetized areas on a color kinescope. The coil is held momentarily in front of the tube, then slowly backed away.

5 - H   An electric generator produces e.m.f. when its rotating armature windings cut the stationary magnetic field produced by the field windings.

6 - A   A flyback transformer in a television set creates a large back e.m.f. when the magnetic field around it is permitted to collapse suddenly. The amount of back e.m.f. produced is proportional to the rate of change of magnetic flux.

7 - E   An electromagnetic field alternating at r.f. frequencies produces eddy currents which heat up the work piece enclosed by an induction coil.

8 - B   The deflection yoke on a kinescope contains horizontal and vertical electromagnetic deflection coils which bend the electron stream on its way to the screen.

9 - F   Radio waves consist of electric and magnetic fields, each alternately producing the other as the wave travels through space. The magnetic field is positioned vertically in a horizontally polarized wave.

10 - D   When metals such as nickel, iron, or cobalt are magnetized, they undergo a change in length. At ultrasonic frequencies the effect is useful for cleaning and as a transducer for sonar.

Crane Aerospace & Electronics (RF & Microwave) - RF Cafe

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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2025
Webmaster: Kirt Blattenberger,
   BSEE - KB3UON - AMA92498
   USAF Radar Technician

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 tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

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