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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Oscillators
RF Cafe Quiz #14

All RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

1. Who from this list is usually credited with being the first to experiment with high frequency oscillator circuits?

a) Benjamin Franklin
b) Nikola Tesla
c) Edwin Armstrong
d) Albert Einstein

2. In the four basic oscillator circuits shown below, what is the primary function of the transistor?

a) Frequency control
b) Amplitude control
c) Compensation for tank circuit losses
d) Isolation

RF Cafe Quiz: oscillator schematic

3. Which type of oscillator circuit is shown to the right?

a) Colpitts oscillator
b) Clapp oscillator
c) Hartley oscillator
d) Pierce oscillator

RF Cafe Quiz: oscillator schematic

4. Which type of oscillator circuit is shown to the right?

a) Colpitts oscillator
b) Clapp oscillator
c) Hartley oscillator
d) Pierce oscillator

RF Cafe Quiz: oscillator schematic

5. Which type of oscillator circuit is shown to the right?

a) Colpitts oscillator
b) Clapp oscillator
c) Hartley oscillator
d) Pierce oscillator

6. Which type of oscillator circuit is shown to the right?

a) Colpitts oscillator
b) Clapp oscillator
c) Hartley oscillator
d) Pierce oscillator

7. Which factor is most important in maintaining spectral purity in an oscillator circuit?

a) Overall circuit Q (quality factor)
b) Component sizes
c) Q of individual components
d) Transistor gain

8. What does the term "frequency pulling" refer to?

a) Change in frequency due to power supply variations
b) Change in frequency due to load variations
c) Change in frequency due to thermal variation
d) All the above

9. In a phase-locked loop (PLL) oscillator circuit, what does the phase detector do?

a) Detects phase
b) Compares relative phase between the reference input and oscillator output and introduces
a shift as necessary to maintain phase coherence
c) Injects random phase shifts at the input to stabilize the output frequency
d) Phase detectors are not used in PLL circuits

10. Complete the following adage used in the days before computer simulators. "If you want an oscillator, design an amplifier. If you want an amplifier, design a(n) ____."

a) Amplifier
b) Filter
c) Oscillator
d) Radio

Need some help? Click here for the answers and explanations.

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OscillatorsRF Cafe Quiz #14

Oscillators
RF Cafe Quiz #14