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Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book.
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470 Oscillators 1. Negative feedback in an amplifier: A. Causes oscillation. B. Increases sensitivity. C. Reduces the gain. D. Is used in an Armstrong oscillator. 2. Oscillation requires: A. A common-drain or common-collector circuit. B. A stage with gain. C. A tapped coil. D. Negative feedback. 3. A Colpitts oscillator can be recognized by: A. A split capacitance in the tuned circuit.
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B. A tapped coil in the tuned circuit. C. A transformer for the feedback. D. A common-base or common-gate arrangement.
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4. In an oscillator circuit, the feedback should be: A. As great as possible. B. Kept to a minimum. C. Just enough to sustain oscillation. D. Done through a transformer whose wires can be switched easily. 5. A tapped coil is used in a(n): A. Hartley oscillator. B. Colpitts oscillator. C. Armstrong oscillator. D. Clapp oscillator. 6. An RF choke: A. Passes RF but not dc. B. Passes both RF and dc. C. Passes dc but not RF. D. Blocks both dc and RF. 7. Ferromagnetic coil cores are not generally good for use in RF oscillators because: A. The inductances are too large. B. It s hard to vary the inductance of such a coil. C. Such coils are too bulky. D. Air-core coils have better thermal stability.
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Quiz 471 8. An oscillator might fail to start for any of the following reasons except: A. Low-power-supply voltage. B. Low stage gain. C. In-phase feedback. D. Very low output impedance. 9. An advantage of a crystal-controlled oscillator over a VFO is: A. Single-frequency operation. B. Ease of frequency adjustment. C. High output power. D. Low drift. 10. The frequency at which a crystal oscillator functions is determined mainly by: A. The values of the inductor and capacitor. B. The thickness of the crystal. C. The amount of capacitance across the crystal. D. The power-supply voltage. 11. The different sounds of musical instruments are primarily the result of: A. Differences in the waveshape. B. Differences in frequency. C. Differences in amplitude. D. Differences in phase. 12. A radio-frequency oscillator usually: A. Has an irregular waveshape. B. Has most or all of its energy at a single frequency. C. Produces a sound that depends on its waveform. D. Uses RC tuning. 13. A varactor diode: A. Is mechanically flexible. B. Has high power output. C. Can produce different waveforms. D. Is good for use in frequency synthesizers. 14. A frequency synthesizer has: A. High power output. B. High drift rate. C. Exceptional stability. D. Adjustable waveshape.
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472 Oscillators 15. A ferromagnetic-core coil is preferred for use in the tuned circuit of an RF oscillator: A. That must have the best possible stability. B. That must have high power output. C. That must work at microwave frequencies. D. No! Air-core coils work better in RF oscillators. 16. If the load impedance for an oscillator is too high: A. The frequency might drift. B. The power output might be reduced. C. The oscillator might fail to start. D. It s not a cause for worry; it can t be too high. 17. The bipolar transistors or JFETs in a multivibrator are usually connected in: A. Class B. B. A common-emitter or common-source arrangement. C. Class C. D. A common-collector or common-drain arrangement. 18. The arrangement in the block diagram of Fig. 25-11 represents: A. A waveform analyzer. B. An audio oscillator. C. An RF oscillator. D. A sine-wave generator.
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25-11 Illustration for quiz question 18.
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19. Acoustic feedback in a public-address system: A. Is useful for generating RF sine waves. B. Is useful for waveform analysis. C. Can be used to increase the amplifier gain. D. Serves no useful purpose.
Quiz 473 20. An IMPATT diode: A. Makes a good audio oscillator. B. Can be used for waveform analysis. C. Is used as a microwave oscillator. D. Allows for frequency adjustment of a VCO.
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