August 1962 Popular Electronics
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OK, class, put your books away and take out a pencil. Spread
your chairs out because we're going to have a quiz today. A
collective sigh permeates the room. Remember those days? I still
have nightmares over those moments, and they were decades ago
for me. At least this "Electronic Noise Quiz" from the August
1962 edition of Popular Electronics won't affect your
GPA. Sometimes PE's quiz illustrations are kind of hard to interpret,
but this one does a pretty good job (except item 'E', but I'm
not telling what it is since nobody helped me). You will need
a fairly diverse background in consumer type electronics to
do well, and having a few gray hairs will probably help as well.
Good luck. BTW, my score was 80%.
Electronic Noise Quiz
By Robert P. Balin
The noises that electrical and electronic devices make can
indicate normal operation or trouble, and a clever technician
trains his ear to distinguish one from the other. Test your
noise knowledge by matching the 10 noises listed below with
the drawings (A-J) of the devices that usually produce them.
Popular Electronics published many quizzes over the years - some
really simple and others not so simple. Robert Balin created many of the quizzes. This is
a listing of all I have posted thus far.
- Test Your
Knowledge of Semiconductors, August 1972
- Ganged Switching Quiz,
- Lamp Brightness Quiz,
Lissajous Pattern Quiz, September 1963
Quizoo, October 1962
Photo Album Quiz, March 1963
Alphabet Quiz, May 1963
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960
Vector-Circuit Matching Quiz, June 1970
Quiz, September 1961
- RC Circuit Quiz,
- Diode Quiz, July
Curves Quiz, February 1963
Electronic Numbers Quiz, December 1962
Conversion Quiz, April 1963
- Coil Function
Quiz, June 1962
Analogy Quiz, August 1960
- Audio Quiz,
Unit Quiz, May 1962
Circuit Quiz, June 1968
on AC Circuit Theory, December 1970
Magnetic Phenomena Quiz, February 1962
Electronics Geography Quiz, April 1970
Menu Quiz, August 1963
Noise Quiz, August 1962
Current Quiz, October 1963
- Electronic Inventors Quiz, November 1963
Function Quiz, January 1962
Measurement Quiz, January 1963
- Vacuum Tube
Quiz, February 1961
- Kool-Keeping Kwiz, June
Electronic Noise Quiz Answers
1 - B) Transformer buzz is usually produced by the
vibration of loose laminations in the transformer's iron core.
2 - H) Relay chatter occurs when the current value
in the relay coil is somewhere between the normal operating
value and the drop-out value.
3 - I) Turntable rumble is a low-frequency vibration
mechanically transmitted to the phono cartridge pickup by the
turntable drive mechanism.
4 - G) Keying chirp is caused by undesirable variations
in transmitted frequency when the transmitter r.f. oscillator
5 - J) Armature growl is a symptomatic sound made by
an armature containing shorted turns when placed on a test-stand
device called a "growler."
6 - A) Loudspeaker boom is produced by self-oscillation
of the speaker at a low-frequency resonant point.
7 - E) Needle scratch is due to a worn stylus point.
Dirt and dust on a record or a defective record can produce
the same sound.
8 - C) Tube hiss is due to electron collisions in an
irregular electron stream caused by an uneven cathode coating.
Although a tape recorder (F) and a car generator (D) will also
produce hiss, they are not the correct answers for question
8, but for 9 and 10 which follow.
9 - F) Tape recorder wow is comprised of slow variations
in the pitch of recorded sounds caused by irregular slippage
or drag in the tape drive mechanism. A turntable (I) with a
friction drive will also produce wow sounds, but (I) has already
been matched with question 3.
10 - D) Generator whine is due to commutator sparking
and changes in frequency with varying engine speeds, and it
sometimes interferes with reception in or from mobile stations.
Posted January 31, 2013