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Like the toroid, the pot core is self-shielding. There is essentially no coupling to external components. A pot core can be used to wind a single, high-inductance coil; sometimes the value can be upwards of 1 H. In a pot-core transformer, the primary and secondary must always be wound on top of, or right next to, each other; this is unavoidable because of the geometry of the shell. Therefore, the interwinding capacitance of a pot-core transformer is always rather high. Pot cores are useful at the lower frequencies. They are generally not employed at higher frequencies because it isn t necessary to get that much inductance.

Sometimes, it s not necessary to provide dc isolation between the primary and secondary windings of a transformer. Then an autotransformer can be used. This has a single, tapped winding. Its schematic symbol is shown in Fig. 18-8A for an air core, and Fig. 18-8B for a ferromagnetic core. An autotransformer can be either a step-down or a step-up device. In Fig. 18-8, the autotransformer at A is step-down, and the one at B is step-up. An autotransformer can have an air core, or it can be wound on any of the aforementioned types of ferromagnetic cores. You ll sometimes see this type of transformer in a radio-frequency receiver or transmitter. It works quite well in impedance-matching applications, and also in solenoidal loopsticks. Autotransformers are occasionally, but not often, used at audio frequencies and in 60-Hz utility wiring. In utility circuits, autotransformers can step down by a large factor, but they aren t used to step up by more than a few percent.

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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

36 The rate of change (derivative) of a pure sine wave is another pure sine wave that has the same frequency as the original wave, and (a) is in phase with the original wave (b) is 180 out of phase with the original wave (c) leads the original wave by 45 (d) lags the original wave by 90 (e) leads the original wave by 90 37 True power is equal to (a) VA power plus imaginary power (b) imaginary power minus VA power (c) the vector difference between VA and reactive power (d) VA power; the two are the same thing (e) 0707 times the VA power 38 Consider a circuit in which three capacitors are connected in series Their values are 47 F, 68 F, and 100 F The total capacitance of this combination is (a) 215 F (b) between 68 F and 100 F.

18-8 Schematic symbols for autotransformers. At A, air core and at B, ferromagnetic core. The unit at A steps down and the one at B steps up.

(c) between 47 F and 68 F (d) 22 F (e) not determinable from the data given 39 The reactance of a section of transmission line depends on all of the following factors except (a) the velocity factor of the line (b) the length of the section (c) the current in the line (d) the frequency of the signal in the line (e) the wavelength of the signal in the line 40 When analyzing a parallel RLC circuit to find the complex impedance, you should (a) add the resistance and reactance to get R + jX (b) find the net conductance and susceptance, convert to resistance and reactance, and then add these to get R + jX (c) find the net conductance and susceptance, and add these to get R + jX (d) rearrange the components so they re connected in series, and find the complex impedance of that circuit.

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Any transformer used in the 60-Hz utility line, intended to provide a certain rms ac voltage for the operation of electrical circuits, is a power transformer. Power transformers exist in sizes ranging from smaller than a tennis ball to as big as a room.

(e) subtract reactance from resistance to get R jX 41 The illustration in Fig Test 2-2 shows a vector R + jX representing (a) XC = 60 and R = 25 (b) XL = 60 and R = 25 (c) XL = 60 H and R = 25 ..

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