January 1963 Popular Electronics
[Table of Contents]People old and young enjoy waxing nostalgic about
and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged.
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The early 1960s was evidently a good time for printing quizzes in
electronics magazines. Popular Electronics was no exception. As
I look through my collection I am finding quite a few. Here is the
latest, from the January 1963 edition, that tests basic knowledge
of using analog multimeters (digital types were not around yet).
I managed to get all the ones I tried correct, but with question
9 I thought maybe it was a trick question, so I didn't bother venturing
a guess. Give it a try for yourself.
Electronic Measurement Quiz
Electronic circuits perform functions similar to many
mechanical devices and natural phenomena, and finding an analogy
between them often leads to a better understanding of both. See
if you can match the numbered electronic circuits on the left with
the lettered sketches on the right.
|Here are other Popular Electronics quizzes:
Electronic Quizoo, October 1962
Electronic Photo Album Quiz, Mar 1963
Electronic Analogy Quiz, Nov 1961
Electronic Alphabet Quiz, May 1963
RC Circuit Quiz, Jun 1963
Diode Quiz, Jul 1961
Kool-Keeping Kwiz, Jun 1970
Electronic Curves Quiz, Feb 1963
Electronic Numbers Quiz, Dec 1962
Energy Conversion Quiz, Apr 1963
Coil Function Quiz, Jun 1962
Electronics Analogy Quiz, Aug 1960
Audio Quiz, April 1955
Electronic Unit Quiz, May 1962
Capacitor Circuit Quiz, Jun 1968
Magnetic Phenomena Quiz, Feb 1962
Electronics Geography Quiz, Apr 1970
Electronic Menu Quiz, Aug 1963
Electronic Noise Quiz, Aug 1962
Electronic Current Quiz, Oct 1963
Electronic Inventors Quiz, Nov 1963
Resistor Function Quiz, Jan 1962
Electronic Measurement Quiz, Jan 1963
Vacuum Tube Quiz, Feb 1961
Electronic Measurement Quiz Answers
If a voltmeter is rated at 20,000 ohms-per-volt, it has an input
resistance of 100 times 20,000 ohms on its 100-volt scale, and 600
times 20,000 ohms on its 600-volt scale. The higher this shunting
resistance is, the less it reduces the resistance across which
the voltage is measured.
2 FALSE. If the instrument does
not have a transit (shorting) position, set it on its highest current
range-because the meter will then be using its lowest value of shunt
resistance. If the meter coil is jiggled while being moved, the
voltage it generates can produce the largest amount of damping
3 TRUE. Glass-and .especially plastic-meter faces
will have a static charge built up on them when they are rubbed
with a dry cloth. The static charges will attract the needle on
the inside, and more dust on the outside. Use a cloth dampened with
anti-static fluid (such as Weston's "Statnul").
Use the highest current range because the ammeter pointer is least
apt to "pin" against a stop. Once the current magnitude has been
determined, step down to lower current scales.
5 TRUE. Meter
friction due to worn bearings or dirt tends to make the needle stop
too soon when it is slowing down for an indication.
Most meters are of the D'Arsonval type, which responds to the average
value of the signal waveform. An a.c. meter scale increases this
reading by a factor of 1.11 in order to indicate r.m.s. values of
sine waves. For a square wave, r.m.s. and average are the same;
hence, the factor is not needed and the meter will read high.
7 TRUE. An ammeter deflects correctly when electrons enter
its negative terminal and leave by its positive terminal.
8 TRUE. If the accuracy of a meter is given, for example, as
3 % of full scale deflection, it means that a reading taken anywhere
on that particular range is accurate to only 3% of the total range
on that scale. Therefore, if reading accuracy is what you want,
select the smallest range that can indicate your reading.
9 FALSE. When determining low resistances, don't measure the
voltage drop across both the unknown resistance and the ammeter.
The ammeter resistance might be of the same magnitude or greater
than the unknown resistance and introduce large errors.
10 TRUE. In selecting the highest voltage scale, you reduce the
possibility of "pinning" the pointer against a stop. Once the voltage
magnitude is determined, step down to lower voltage scales.