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13. If a complex impedance is represented by 34 j23, what is the absolute-value impedance (a) 34 (b) 11 (c) 23 (d) 41 (e) 57 14. Suppose a coil has an inductance of 750 H. What is the inductive reactance at 100 kHz (a) 75.0 (b) 75.0 k (c) 471 (d) 47.1 k (e) 212 15. If two sine waves are 180 out of phase, it represents a difference of (a) 1 8 of a cycle. (b) 1 4 of a cycle. (c) 1 2 of a cycle. (d) 1 full cycle. (e) 2 full cycles. 16. If R denotes resistance and Z denotes absolute-value impedance, then R/Z represents the (a) true power. (b) imaginary power. (c) apparent power. (d) absolute-value power. (e) power factor. 17. Suppose two components are connected in series. One component has a complex impedance of 30 + j50, and the other component has a complex impedance of 50 j30. What is the impedance of the series combination (a) 80 + j80 (b) 20 + j20 (c) 20 j20 (d) 20 + j20 (e) 80 + j20 18. Suppose two inductors, having values of 140 H and 1.50 mH, are connected in series. What is the net inductance (a) 141.5 H (b) 1.64 H (c) 0.1415 mH
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Test: Part 2 307
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(d) 1.64 mH (e) 0.164 mH 19. Which of the following types of capacitor is polarized (a) Mica (b) Paper (c) Electrolytic (d) Air variable (e) Ceramic 20. A coil with a toroidal, ferromagnetic core (a) has less inductance than an air-core coil with the same number of turns. (b) is essentially self-shielding. (c) works well as a loopstick antenna. (d) is ideal as a transmission-line transformer. (e) cannot be used at frequencies below 10 MHz. 21. The efficiency of an electric generator (a) depends on the mechanical driving power source. (b) is equal to the electrical output power divided by the mechanical input power. (c) depends on the nature of the electrical load. (d) is equal to driving voltage divided by output voltage. (e) is equal to driving current divided by output current. 22. Admittance is (a) the reciprocal of reactance. (b) the reciprocal of resistance. (c) a measure of the opposition a circuit offers to ac. (d) a measure of the ease with which a circuit passes ac. (e) another expression for absolute-value impedance. 23. The absolute-value impedance Z of a parallel RLC circuit, where R is the resistance and X is the net reactance, is found according to which of the following formulas (a) Z = R + X (b) Z 2 = R 2 + X 2 (c) Z 2 = R 2X 2/(R 2 + X 2 ) (d) Z = 1/(R 2 + X 2) (e) Z = R 2X 2/(R + X ) 24. Complex numbers are used to represent impedance because (a) reactance cannot store power. (b) reactance isn t a real physical thing.
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308 Test: Part 2
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(c) they provide a way to represent what happens in resistance-reactance circuits. (d) engineers like to work with sophisticated mathematics. (e) Forget it! Complex numbers are never used to represent impedance. 25. Which of the following (within reason) has no effect on the value, in farads, of a capacitor (a) The mutual surface area of the plates (b) The dielectric constant of the material between the plates (c) The spacing between the plates (d) The amount of overlap between plates (e) The frequency 26. The 0 phase point in an ac sine wave is usually considered to be the point in time at which the instantaneous amplitude is (a) zero and negative-going. (b) at its negative peak. (c) zero and positive-going. (d) at its positive peak. (e) any value; it doesn t matter. 27. The inductance of a coil can be adjusted in a practical way by (a) varying the frequency of the signal applied to the coil. (b) varying the number of turns using multiple taps. (c) varying the current in the coil. (d) varying the wavelength of the signal applied to the coil. (e) varying the voltage across the coil. 28. Power factor is defined as the ratio of (a) true power to VA power. (b) true power to imaginary power. (c) imaginary power to VA power. (d) imaginary power to true power. (e) VA power to true power. 29. Consider a situation in which you want to match a feed line with Zo = 50 to an antenna with a purely resistive impedance of 200 . A quarter-wave matching section should have which of the following (a) Zo = 150 (b) Zo = 250 (c) Zo = 125 (d) Zo = 133 (e) Zo = 100
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