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Refer to the text in this chapter if necessary. A good score is 18 or more correct. Answers are in the back of the book. 1. In a step-up transformer: A. The primary impedance is greater than the secondary impedance. B. The secondary winding is right on top of the primary. C. The primary voltage is less than the secondary voltage. D. All of the above. 2. The capacitance between the primary and the secondary windings of a transformer can be minimized by: A. Placing the windings on opposite sides of a toroidal core. B. Winding the secondary right on top of the primary. C. Using the highest possible frequency. D. Using a center tap on the balanced winding. 3. A transformer steps a voltage down from 117 V to 6.00 V. What is its primary-to-secondary turns ratio A. 1:380. B. 380:1. C. 1:19.5. D. 19.5:1. 4. A step-up transformer has a primary-to-secondary turns ratio of 1:5.00. If 117 V rms appears at the primary, what is the rms voltage across the secondary A. 23.4 V.

present along with reactance, impedance vectors point at angles; they are neither vertical nor horizontal.

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Quiz 343 B. 585 V. C. 117 V. D. 2.93 kV. 5. A transformer has a secondary-to-primary turns ratio of 0.167. This transformer is: A. A step-up unit. B. A step-down unit. C. Neither step-up nor step-down. D. A reversible unit. 6. Which of the following is false, concerning air cores versus ferromagnetic cores A. Air concentrates the magnetic lines of flux. B. Air works at higher frequencies than ferromagnetics. C. Ferromagnetics are lossier than air. D. A ferromagnetic-core unit needs fewer turns of wire than an equivalent air-core unit. 7. Eddy currents cause: A. An increase in efficiency. B. An increase in coupling between windings. C. An increase in core loss. D. An increase in usable frequency range. 8. A transformer has 117 V rms across its primary and 234 V rms across its secondary. If this unit is reversed, assuming it can be done without damaging the windings, what will be the voltage at the output A. 234 V. B. 468 V. C. 117 V. D. 58.5 V. 9. The shell method of transformer winding: A. Provides maximum coupling. B. Minimizes capacitance between windings. C. Withstands more voltage than other winding methods. D. Has windings far apart but along a common axis. 10. Which of these core types, in general, is best if you need a winding inductance of 1.5 H A. Air core. B. Ferromagnetic solenoid core. C. Ferromagnetic toroid core. D. Ferromagnetic pot core.

been deployed because (1) loss is minimized in this region, and (2) dispersion minimums can be shifted here. The relatively new L band has enjoyed some early success as the next effective operating window. Notice also that Rayleigh scattering is shown to occur at or around 1,000 nm, while hydroxyl absorption by water occurs at 1,240 and 1,390 nm. Needless to say, network designers would be well served to avoid transmitting at any of the points on the graph where Rayleigh scattering, high degrees of loss, or hydroxyl absorption have the greatest degree of impact. Note also that dispersion, shown by the lower line, is at a minimum point in the second window, while loss, shown by the upper line, drops to a minimum point in the third window. In fact, dispersion is minimized in traditional single-mode fiber at 1,310 nm, whereas loss is at minimums at 1,550 nm. So, the obvious question becomes this: which one do you want to minimize: loss or dispersion Luckily, this choice no longer has to be made. Today, dispersion-shifted fibers (DSF) have become common. By modifying the manufacturing process, engineers can shift the point at which minimum dispersion occurs from 1,310 nm to 1,550 nm, causing it to coincide with the minimum loss point such that loss and dispersion occur at the same wavelength. Unfortunately, although this fixes one problem, it creates a new and potentially serious alternative problem. DWDM has become a mainstay technology for multiplying the available bandwidth in optical systems. When DWDM is deployed over dispersion-shifted fiber, serious non-

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