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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 are true. 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.
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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 ac rms voltage across the secondary (a) 23.4 V rms (b) 585 V rms (c) 117 V rms (d) 2.93 kV rms 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 a step-up unit nor a step-down unit. (d) a reversible unit. 6. Which of the following statements is false, concerning air cores compared with 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 transformer needs fewer turns of wire than an equivalent air-core transformer. 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. Suppose a transformer has an ac voltage of 117 V rms across its primary, and 234 V rms appears across its secondary. If this transformer is reversed (that is, connected backward), assuming that this be done without damaging the windings, what will be the voltage at the output (a) 234 V rms (b) 468 V rms (c) 117 V rms (d) 58.5 V rms 9. The shell method of transformer winding (a) provides maximum coupling. (b) minimizes capacitance between windings.
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(c) withstands more voltage than other winding methods. (d) has windings far apart but along a common axis. 10. Which of these core types 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 11. An advantage of a toroid core over a solenoid core is the fact that (a) the toroid works at higher frequencies. (b) the toroid confines the magnetic flux. (c) the toroid can work for dc as well as for ac. (d) it is easier to wind the turns on a toroid. 12. High voltage is used in long-distance power transmission because (a) it is easier to regulate than low voltage. (b) the I 2R losses are minimized. (c) the electromagnetic fields are strong. (d) small transformers can be used. 13. In a household circuit, 234-V rms electricity usually has (a) one phase. (b) two phases. (c) three phases. (d) four phases. 14. In a transformer, a center tap often exists in (a) the primary winding. (b) the secondary winding. (c) an unbalanced winding. (d) a balanced winding. 15. An autotransformer (a) can be adjusted automatically. (b) has a center-tapped secondary. (c) consists of a single tapped winding. (d) is useful only for impedance matching. 16. Suppose a transformer has a primary-to-secondary turns ratio of 2.00:1. The input impedance is 300 , purely resistive. What is the output impedance (a) 75 , purely resistive (b) 150 , purely resistive (c) 600 , purely resistive (d) 1200 , purely resistive
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