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Test: Part two
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DO NOT REFER TO THE TEXT WHEN TAKING THIS TEST. A GOOD SCORE IS AT least 37 correct. Answers are in the back of the book. It s best to have a friend check your score the first time, so you won t memorize the answers if you want to take the test again. 1. A series circuit has a resistance of 100 and a capacitive reactance of -200 . The complex impedance is: A. 200 j100. B. 100 j200. C. 200 j100. D. 200 j100. E. 100 j200. 2. Mutual inductance causes the net value of a set of coils to: A. Cancel out, resulting in zero inductance. B. Be greater than what it would be with no mutual coupling. C. Be less than what it would be with no mutual coupling. D. Double. E. Vary, depending on the extent and phase of mutual coupling. 3. Refer to Fig. TEST 2-1. Wave A is: A. Leading wave B by 90 degrees. B. Lagging wave B by 90 degrees. C. Leading wave B by 180 degrees. D. Lagging wave B by 135 degrees. 346
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Test: Part two 347 E. Lagging wave B by 45 degrees.
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TEST 2-1 Illustration for PART TWO test question 3.
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4. A sine wave has a peak value of 30.0 V. Its rms value is: A. 21.2 V. B. 30.0 V. C. 42.4 V. D. 60.0 V. E. 90.0 V. 5. Four capacitors are connected in parallel. Their values are 100 pF each. The net capacitance is: A. 25 pF. B. 50 pF. C. 100 pF. D. 200 pF. E. 400 pF. 6. A transformer has a primary-to-secondary turns ratio of exactly 8.88:1. The input voltage is 234 V rms. The output voltage is: A. 2.08 kV rms. B. 18.5 kV rms. C. 2.97 V rms. D. 26.4 V rms. E. 20.8 V rms. 7. In a series RL circuit, as the resistance becomes small compared with the reactance, the angle of lag approaches: A. 0 degrees.
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348 Test: Part two B. 45 degrees. C. 90 degrees. D. 180 degrees. E. 360 degrees. 8. A transmission line carries 3.50 A of ac current and 150 V ac. The true power in the line is: A. 525 W. B. 42.9 W. C. 1.84 W. D. Meaningless; true power is dissipated, not transmitted. E. Variable, depending on standing wave effects. 9. In a parallel configuration, susceptances: A. Simply add up. B. Add like capacitances in series. C. Add like inductances in parallel. D. Must be changed to reactances before you can work with them. E. Cancel out. 10. A wave has a frequency of 200 kHz. How many degrees of phase change occur in a microsecond (a millionth of a second) A. 180 degrees. B. 144 degrees. C. 120 degrees. D. 90 degrees. E. 72 degrees. 11. At a frequency of 2.55 MHz, a 330-pF capacitor has a reactance of: A. 5.28 . B. 0.00528 . C. 189 . D. 18.9k . E. 0.000189 . 12. A transformer has a step-up turns ratio of 1:3.16. The output impedance is 499 purely resistive. The input impedance is: A. 50.0 . B. 158 . C. 1.58k . D. 4.98k . E. Not determinable from the data given.
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Test: Part two 349 13. A complex impedance is represented by 34 j23. The absolute-value impedance is: A. 34 . B. 11 . C. 23 . D. 41 . E. 57 . 14. A coil has an inductance of 750 H. The inductive reactance at 100 kHz is: A. 75.0 . B. 75.0 k . C. 471 . D. 47.1 k . E. 212 . 15. Two waves are 180 degrees out of phase. This is a difference of: A. 1/8 cycle. B. 1/4 cycle. C. 1/2 cycle. D. A full cycle. E. Two full cycles. 16. If R denotes resistance and Z denotes absolute-value impedance, then R/Z is the: A. True power. B. Imaginary power. C. Apparent power. D. Absolute-value power. E. Power factor. 17. Two complex impedances are in series. One is 30 + j50 and the other is 50 j30. The net impedance is: A. 80 + j80. B. 20 + j20. C. 20 j20. D. 20 + j20. E. 80 + j20. 18. Two inductors, having values of 140 H and 1.50 mH, are connected in series. The net inductance is: A. 141.5 H. B. 1.64 H.
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350 Test: Part two C. 0.1415 mH. 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 toroidal-core coil: A. Has lower 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 about 10 MHz.
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21. The efficiency of a generator: A. Depends on the driving power source. B. Is equal to output power divided by driving power. C. Depends on the nature of the load. D. Is equal to driving voltage divided by output voltage. E. Is equal to driving current divided by output current.
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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 the formula: A. Z R + X. B. Z2 R2 + X2. C. Z2 RX/(R2 + X2). D. Z 1/(R2 + X2). E. Z R2X2/(R + X). 24. Complex numbers are used to represent impedance because: A. Reactance cannot store power.
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