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August 1962 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. As time permits, I will be glad to scan articles for you. All copyrights (if any) are hereby acknowledged.
|Here are other Popular Electronics quizzes:|
RC Circuit Quiz, Jun 1963
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 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 is keyed.
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