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# Electronics Math QuizNovember 1965 Popular Electronics

 November 1965 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.

1965 was near the beginning of the transition from vacuum tubes (plasma state) to semiconductors (solid state). If you are not familiar with tube circuits, when deciding what type of mathematical operation is being performed by each circuit, mentally replace the tube with a FET or a BJT. The tube plate becomes the transistor drain or collector, the cathode is the source or emitter, and the control grid is the gate or base, respectively. Don't worry about biasing. Circuits A, D, and I should prove to be the easiest. Circuit F is pretty obvious if you look at the input and output waveforms shown. Anyone familiar with analog power supplies will breeze through circuits B and G (hint: count the number of charge storage components). For the others, ignore that there is a squarewave shown at the input since the function is not dependent on a squarewave to work. For circuit H, mentally reposition the bottom tube above the other and have the B+ line point upward, then figure out what happens as each turns on. It was common to draw B+ lines pointing downward whereas in transistor circuits they normally point upward or sideward. Think of the two tubes in circuit E as parallel resistors changing value (point B+ upward). Circuit C takes a bit of work (hint: the circuit is a detector). Circuit J is the toughest of all, but if you get the other 9 correct, only one possible answer remains from which to choose - that's how I scored 10:10.

Electronics Math Quiz

By Robert P. Balin

Many basic electronic circuits can and do perform mathematical operations ranging from elementary arithmetic to integral calculus. See if you can identify the electronic circuits (A-J) below which perform the mathematical operations (1-10) at right.

1) Add ____________

2) Count ____________

3) Differentiate ____________

4) Double ____________

5) Divide ____________

6) Integrate ____________

7) Ratio ____________

8) Square ____________

9) Subtract ____________

10) Triple ____________

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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RF Cafe Quiz #21: Wireless Standards Knowledge RF Cafe Quiz #20: Famous First Names RF Cafe Quiz #19: Basic Circuit Theory RF Cafe Quiz #18: Archaic Scientific Words & Definitions RF Cafe Quiz #17: Inventors & Their Inventions RF Cafe Quiz #16: Antennas RF Cafe Quiz #15: Numerical Constants RF Cafe Quiz #14: Oscillators RF Cafe Quiz #13: General Knowledge RF Cafe Quiz #12: Electronics Corporations Headquarters RF Cafe Quiz #11: Famous Inventors & Scientists RF Cafe Quiz #10: A Sampling of RF & Wireless Topics RF Cafe Quiz #9: A Smorgasbord of RF Topics RF Cafe Quiz #8: Hallmark Decades in Electronics RF Cafe Quiz #7: Radar Fundamentals RF Cafe Quiz #6: Wireless Communications Fundamentals RF Cafe Quiz #5: Company Logo Recognition RF Cafe Quiz #4: General RF Topics RF Cafe Quiz #3: General RF/Microwave Topics RF Cafe Quiz #2: General RF Topics RF Cafe Quiz #1: General RF Knowledge 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 Vintage Electronics Magazine Quizzes 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 Vintage Electronics Magazine Quizzes What's Your EQ? - April 1967 Radio-Electronics What's Your EQ? - March 1967 Radio-Electronics What's Your EQ? - December 1964 Radio-Electronics What's Your EQ? - January 1967 Radio-Electronics Wanted: 50,000 Engineers - January 1953 Popular Mechanics What's Your EQ? - August 1964 Radio-Electronics Voltage Quiz - December 1961 Popular Electronics What is It? -  June 1941 Popular Science What Do You Know About Resistors? - April 1974 Popular Electronics What's Your EQ? - September 1963 Radio-Electronics Potentiometer Quiz - September 1962 Popular Electronics Mathematical Bafflers - March 1965 Mechanix Illustrated Op Amp Quiz - October 1968 Popular Electronics Electronic "A" Quiz - April 1968 Popular Electronics What's Your EQ? - May 1961 Radio-Electronics Popular Science Question Bee - February 1939 Popular Science What is It? - A Question Bee in Photographs - June 1941 Popular Science What's Your EQ? - June 1961 Radio-Electronics What's Your EQ? - June 1964 Radio-Electronics What's Your EQ? - May 1964 Radio-Electronics What's Your EQ? - August 1963 Radio-Electronics What's Your EQ? - May 1963 Radio-Electronics Bridge Function Quiz - September 1969 Radio-Electronics What's Your EQ? - March 1963 Radio-Electronics What's Your EQ? - February 1967 Radio-Electronics Circuit Quiz - June 1966 Radio-Electronics What's Your EQ? - June 1966 Radio-Electronics Electronics Mathematics Quiz - June 1969 Popular Electronics Brightest Light Quiz - April 1964 Popular Electronics What's Your EQ? - April 1963 Radio-Electronics Electronics "B" Quiz - July 1969 Popular Electronics Ohm's Law Quiz - March 1969 Popular Electronics Antenna Quiz - November 1962 Electronics World Color Code Quiz - November 1967 Popular Electronics CapaciQuiz - August 1961 Popular Electronics Transformer Winding Quiz - December 1964 Popular Electronics Audiophile Quiz - November 1957 Radio-electronics Capacitor Function Quiz - March 1962 Popular Electronics Greek Alphabet Quiz - December 1963 Popular Electronics Circuit Designer's Name Quiz - July 19680 Popular Electronics Sawtooth Sticklers Quiz - November 1960 Radio-Electronics 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

Math Quiz Answers

1 - H   Amplifiers which have their load resistors in series produce an output signal proportional to the sum of the in-phase input signals.

2 - F   A step counter produces an escalated output which varies exponentially with the number of pulses it receives. It can be used to count the number of pulses it receives, and as a frequency divider by allowing it to trigger another circuit, say at every 2nd, 3rd ... 7th step, as desired.

3 - I   A differentiator circuit produces an output whose instantaneous values are proportional to the rate of change of the input voltage waveform.

4 - G   A voltage doubler produces a d.c. output which is approximately equal to twice the r.m.s. value of the a.c. input voltage.

5 - D   A voltage divider provides an output which is in the same proportion to the applied voltage as the divider resistance is to the total resistance.

6 - A   An integrating circuit provides an output voltage which is approximately proportional to the time integral and potential of the input voltage.

7 - J   In a ratio detector circuit, the variations of audio frequency output signals have the same ratio as the variations of the applied FM radio frequency signals.

8 - C   A triode square law detector produces an output signal which is proportional to the square of the input signal.

9 - E   A differential amplifier produces an output signal whose amplitude is proportional to the difference between two in-phase input signals.

10 - B   A voltage tripler circuit produces a d.c. output which is approximately equal to three times the r.m.s. value of the a.c. input voltage.

Posted April 25, 2018

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