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Quiz 381 7. A time-domain display might be found in: A. An ammeter. B. A spectrum analyzer. C. A digital voltmeter. D. An oscilloscope. 8. Zener voltage is also known as: A. Forward breakover voltage. B. Peak forward voltage. C. Avalanche voltage. D. Reverse bias. 9. The forward breakover voltage of a silicon diode is: A. About 0.3 V. B. About 0.6 V. C. About 1.0 V. D. Dependent on the method of manufacture. 10. A diode audio limiter circuit: A. Is useful for voltage regulation. B. Always uses Zener diodes. C. Rectifies the audio to reduce distortion. D. Can cause objectionable signal distortion. 11. The capacitance of a varactor varies with: A. Forward voltage. B. Reverse voltage. C. Avalanche voltage. D. Forward breakover voltage. 12. The purpose of the I layer in a PIN diode is to: A. Minimize the diode capacitance. B. Optimize the avalanche voltage. C. Reduce the forward breakover voltage. D. Increase the current through the diode. 13. Which of these diode types might be found in the oscillator circuit of a microwave radio transmitter A. A rectifier diode. B. A cat whisker. C. An IMPATT diode. D. None of the above.
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382 Some uses of diodes 14. A Gunnplexer can be used as a: A. Communications device. B. Radio detector. C. Rectifier. D. Signal mixer. 15. The most likely place you would find an LED would be: A. In a rectifier circuit. B. In a mixer circuit. C. In a digital frequency display. D. In an oscillator circuit. 16. Coherent radiation is produced by a: A. Gunn diode. B. Varactor diode. C. Rectifier diode. D. Laser diode. 17. You want a circuit to be stable with a variety of amplifier impedance conditions. You might consider a coupler using: A. A Gunn diode. B. An optoisolator. C. A photovoltaic cell. D. A laser diode. 18. The power from a solar panel depends on all of the following except: A. The operating frequency of the panel. B. The total surface area of the panel. C. The number of cells in the panel. D. The intensity of the light. 19. Emission of energy in an IRED is caused by: A. High-frequency radio waves. B. Rectification. C. Electron energy-level changes. D. None of the above. 20. A photodiode, when not used as a photovoltaic cell, has: A. Reverse bias. B. No bias. C. Forward bias. D. Negative resistance.
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MOST ELECTRONIC EQUIPMENT NEEDS DIRECT CURRENT (DC) TO WORK. BATTERies produce dc, but there is a limit to how much energy and how much voltage a battery can provide. The same is true of solar panels. The electricity from the utility company is alternating current (ac) with a frequency of 60 Hz. In your house, most wall outlets carry an effective voltage of 117 V; some have 234 V. The energy from a wall outlet is practically unlimited, but it must be converted from ac to dc, and tailored to just the right voltage, to be suitable for electronic equipment.
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A power supply provides the proper voltage and current for electronic apparatus. Most power supplies consist of several stages, always in the same order (Fig. 21-1).
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21-1 Block diagram of a power supply. Sometimes a regulator is not needed.
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First, the ac encounters a transformer that steps the voltage either down or up, depending on the exact needs of the electronic circuits. 383
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384 Power supplies Second, the ac is rectified, so that it becomes pulsating dc with a frequency of either 60 Hz or 120 Hz. This is almost always done by one or more semiconductor diodes. Third, the pulsating dc is filtered, or smoothed out, so that it becomes a continuous voltage having either positive or negative polarity with respect to ground. Finally, the dc voltage might need to be regulated. Some equipment is finicky, insisting on just the right amount of voltage all the time. Other devices can put up with some voltage changes. Power supplies that provide more than a few volts must have features that protect the user (that s you!) from receiving a dangerous electrical shock. All power supplies need fuses and/or circuit breakers to minimize the fire hazard in case the equipment shorts out.
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