December 1966 Popular Electronics
Table 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.
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I found this Bridge Circuit
Quiz in my stack of vintage Popular Electronics magazines (I thought all had
been posted). I just
ordered another batch of Popular Electronics on eBay, so that will provide a dozen or
so more quizzes. Your challenge here, compliments of Robert P. Balin, is to decide
what the main function of each type of bridge circuit is. Most bridge circuits are designed
such that a component of unknown value is inserted into one of its four branches, and
then one or more variable components of known values are adjusted to balance the bridge
and thereby create a minimum (null) between opposite (circuit-wise) nodes. Admittedly,
I did not fare well, but it is because I do not recall having the names associated with
many of these
bridge circuits. Of course nearly everyone is familiar with the Wheatstone, Kelvin,
and Wien bridges. Hyperlinks are provided to information on the bridge circuit theory.
I could not find any specific page for Mr. Resonance's bridge, but interestingly
many of the pages Google returns has to do with the
Tacoma Narrows Bridge (Galloping Gertie) self-destruction due to resonance.
Bridge Circuit Quiz
By Robert P. Balin
Most electronic technicians are familiar with
the widely used Wheatstone bridge. But many are not so familiar with other types of bridges
commonly used in the laboratory for measurement of impedance-resistive, reactive, inductive,
or capacitive - at frequencies well up into the UHF band. Bridges employ the so-called
null method to measure an unknown quantity, either directly or by computation. In the
latter case, values of some of the fixed and adjustable components in the bridge are
substituted in an applicable equation, which is then solved for the unknown quantity.
See how many circuits (A-J) you can identify by name (1-10).
See answers below.
Quizzes from vintage electronics magazines such as Popular
Electronics, Electronics-World, QST, 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.
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-
Elementary
Radio Quiz - December 1947 Radio-Craft
- Hi-Fi
Quiz - October 1955 Radio & Television News
- Electronics Physics
Quiz - March 1974 Popular Electronics
- A Baffling Quiz
- January 1968 Popular Electronics
- Electronics IQ
Quiz - May 1967 Popular Electronics
- Plug and Jack
Quiz - December 1967 Popular Electronics
- Electronic
Switching Quiz - October 1967 Popular Electronics
- Electronic
Angle Quiz - September 1967 Popular Electronics
- International
Electronics Quiz - July 1967 Popular Electronics
- FM Radio
Quiz - April 1950 Radio & Television News
- Bridge Circuit
Quiz -December 1966 Popular Electronics
- Diode Function
Quiz - August 1965 Popular Electronics
- Diagram Quiz,
August 1966 Popular Electronics
- Quist Quiz - November
1953 QST
- TV Trouble Quiz,
July 1966 Popular Electronics
- Electronics History Quiz,
December 1965 Popular Electronics
- Scope-Trace Quiz,
March 1965 Popular Electronics
-
Electronic
Circuit Analogy Quiz, April 1973
-
Test Your Knowledge of Semiconductors, August 1972 Popular Electronics
- Ganged Switching
Quiz, April 1972 Popular Electronics
- Lamp Brightness
Quiz, January 1969 Popular Electronics
- Lissajous Pattern Quiz, September 1963 Popular Electronics
- Electronic
Quizoo, October 1962 Popular Electronics
- Electronic Photo Album Quiz, March 1963 Popular Electronics
- Electronic Alphabet Quiz, May 1963 Popular Electronics
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960 Popular Electronics
- Vector-Circuit Matching Quiz, June 1970 Popular Electronics
- Inductance
Quiz, September 1961 Popular Electronics
- RC Circuit Quiz,
June 1963 Popular Electronics
- Diode Quiz, July
1961 Popular Electronics
- Electronic Curves Quiz, February 1963 Popular Electronics
- Electronic Numbers Quiz, December 1962 Popular Electronics
- Energy Conversion Quiz, April 1963 Popular Electronics
- Coil Function
Quiz, June 1962 Popular Electronics
-
Co-Inventors Quiz - January 1965 Electronics World
-
"-Tron" Teasers Quiz - October 1963 Electronics World
- Polarity Quiz
- March 1968 Popular Electronics
-
Television
I.Q. Quiz - October 1948 Radio & Television News
- Amplifier Quiz
Part I - February 1964 Popular Electronics
- Semiconductor
Quiz - February 1967 Popular Electronics
- Unknown
Frequency Quiz - September 1965 Popular Electronics
- Electronics
Metals Quiz - October 1964 Popular Electronics
- Electronics
Measurement Quiz - August 1967 Popular Electronics
- Meter-Reading
Quiz, June 1966 Popular Electronics
- Electronic
Geometry Quiz, January 1965 Popular Electronics
- Electronic
Factor Quiz, November 1966 Popular Electronics
- Electronics
Math Quiz, November 1965 Popular Electronics
- Series Circuit
Quiz, May 1966 Popular Electronics
- Electrochemistry
Quiz, March 1966 Popular Electronics
- Biz
Quiz: Test Your Sales Ability - April 1947 Radio News
- Electronic
Analogy Quiz, November 1961 Popular Electronics
- Electronic
Coupling Quiz, August 1973 Popular Electronics
- Electronics Analogy Quiz, August 1960 Popular Electronics
- Audio Quiz, April
1955 Popular Electronics
- Electronic Unit
Quiz, May 1962 Popular Electronics
- Capacitor
Circuit Quiz, June 1968 Popular Electronics
- Quiz on AC Circuit Theory, December 1970 Popular Electronics
- Magnetic Phenomena Quiz, February 1962 Popular Electronics
- Electronics Geography Quiz, April 1970 Popular Electronics
- Electronic
Menu Quiz, August 1963 Popular Electronics
- Electronic Noise Quiz, August 1962 Popular Electronics
- Electronic Current Quiz, October 1963 Popular Electronics
- Electronic Inventors Quiz, November 1963 Popular Electronics
- Resistor Function
Quiz, January 1962 Popular Electronics
- Electronic Measurement Quiz, January 1963 Popular Electronics
- Vacuum Tube Quiz,
February 1961 Popular Electronics
- Kool-Keeping Kwiz, June
1970 Popular Electronics
- Find the Brightest
Bulb Quiz, April 1960 Popular Electronics
-
Where Do the Scientists Belong? - Feb 19, 1949 Saturday Evening
Post
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Answers
1 - J The Carey Foster bridge measures capacitance in terms of mutual
conductance, and mutual conductance in terms of capacitance.
2 - H The Hay bridge measures the self-inductance of high-Q coils (Q greater
than 10), and also determines unknown frequencies.
3 - D The Heaviside bridge measures the mutual inductance of the coils
of a transformer in terms of a known self-inductance and known resistances.
4 - I The Kelvin bridge is used when extremely low resistances - down
to 0.001 ohm - are to be measured.
5 - C The Maxwell bridge measures the self-inductance of low-Q coils (Q
of 10 or less).
6 - F The Owen bridge, like the Hay and Maxwell bridges, measures the
self-inductance of coils. The main difference between the Owen and the other two bridges
is that the Owen bridge has the two adjustable components in the same arm.
7 - A The Resonance bridge measures capacitance, inductance, and frequency.
8 - G The Schering bridge measures capacitance in terms of a standard
capacitor and known resistances.
9 - B The Wheatstone bridge, oldest of the bridge family, is used where
accurate resistance measurements - in the range of 1 ohm to approximately 1 megohm -
are to be made.
10 - E A Wien bridge is used to measure capacitance by comparison with
a standard capacitor, and inductance by comparison with a standard inductor.
Posted June 22, 2018
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