Gibilisco S. Teach Yourself Electricity and Electronics
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92. Which of the following substances is sometimes used as the semiconductor material in
junction field-effect transistors (JFETs)?
(a) Gallium arsenide
(b) Mica
(c) Glass
(d) Polystyrene
(e) Porcelain
93. Suppose that five resistors, each one having the same ohmic value as all the others, are
connected in parallel, and the entire combination is connected to a 12-V battery. How does the
current through any one of the resistors compare with the current drawn from the battery?
(a) The current through any one of the resistors is 5 times the current drawn from the
battery.
(b) The current through any one of the resistors is the same as the current drawn from the
battery.
(c) The current through any one of the resistors is
1
⁄5 as great as the current drawn from the
battery.
(d) The current through any one of the resistors is
1
⁄25 as great as the current drawn from
the battery.
(e) It is impossible to answer this without more information.
94. Figure Exam-7 illustrates a method of
(a) wireless-only encryption.
(b) end-to-end encryption.
(c) wireless tapping of a cell phone set.
(d) wireless tapping of a cordless phone set.
(e) dual-diversity shortwave reception.
95. In Fig. Exam-7, the box at the top contains a query symbol (?). What type of device should
this be, in order for the system to perform its intended task?
(a) A low-frequency receiver
(b) A microwave transponder
(c) A video and data receiver
(d) A wireless transmitter
(e) A GPS receiver
96. Some substances cause magnetic lines of flux to bunch closer together than they would be if
the magnetic field existed in a vacuum. This property is known as
(a) electromagnetism.
(b) diamagnetism.
(c) flux magnification.
(d) flux constriction.
(e) ferromagnetism.
Final Exam 641
97. In digital audio tape recording and reproduction, the noise can be practically eliminated because
(a) noise is analog in nature, and can be nulled or filtered out without degrading the digital
signals.
(b) noise is digital in nature, and can be eliminated by means of specialized computer programs.
(c) music and voices are digital in nature, and can be reproduced multiple times without
distortion.
(d) music and voices are analog in nature, while noise is digital and can therefore be canceled
out.
(e) Forget it! In a digital audio tape recording system, noise is a more serious problem than it
is in an analog system.
642 Final Exam
Exam-7 Illustration for
Final Exam
Questions 94
and 95.
98. Imagine a capacitor and resistor connected in series, such that the capacitive reactance is
equal to −200 Ω and the resistance is equal to 200 Ω at a frequency of 70 MHz. How are the
instantaneous current and the instantaneous voltage related?
(a) They are in phase.
(b) They are 90° out of phase.
(c) The current leads the voltage by 45°.
(d) The current lags the voltage by 45°.
(e) None of the above are true.
99. The amount of current that a silicon photodiode can deliver in direct sunlight depends on
(a) the forward breakover voltage.
(b) the thickness of the substrate.
(c) the surface area of the P-N junction.
(d) the applied voltage.
(e) the reverse bias.
100. Fill in the blank to make the following sentence true: “Electrical current can be expressed in
terms of the number of
passing a given point per unit time.”
(a) neutrons
(b) webers or gauss
(c) charge carriers
(d) wave cycles
(e) isotopes
Final Exam 643
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Chapter 1
1. b 2. c 3. d 4. d 5. d
6. a 7. b 8. c 9. a 10. b
11. c 12. a 13. d 14. c 15. c
16. a 17. c 18. b 19. c 20. d
Chapter 2
1. b 2. c 3. d 4. b 5. c
6. a 7. c 8. c 9. a 10. d
11. d 12. a 13. b 14. b 15. c
16. d 17. b 18. c 19. a 20. c
Chapter 3
1. b 2. a 3. c 4. c 5. a
6. d 7. c 8. a 9. d 10. c
11. a 12. b 13. a 14. c 15. d
16. b 17. d 18. a 19. c 20. b
Chapter 4
1. a 2. c 3. d 4. a 5. b
6. d 7. c 8. a 9. c 10. a
11. d 12. b 13. d 14. b 15. a
16. c 17. c 18. a 19. d 20. b
645
A
APPENDIX
Answers to Quiz, Test, and
Exam Questions
Copyright © 2006, 2002, 1997, 1993 by The McGraw-Hill Companies, Inc. Click here for terms of use.
Chapter 5
1. b 2. d 3. c 4. c 5. a
6. b 7. d 8. a 9. b 10. d
11. b 12. c 13. b 14. c 15. a
16. c 17. b 18. c 19. b 20. c
Chapter 6
1. c 2. a 3. a 4. c 5. d
6. b 7. b 8. c 9. b 10. c
11. d 12. c 13. a 14. c 15. a
16. a 17. b 18. c 19. b 20. a
Chapter 7
1. c 2. c 3. b 4. c 5. d
6. b 7. a 8. b 9. a 10. d
11. b 12. a 13. b 14. c 15. d
16. c 17. c 18. c 19. a 20. d
Chapter 8
1. c 2. a 3. d 4. b 5. c
6. b 7. b 8. c 9. a 10. c
11. c 12. d 13. b 14. a 15. d
16. d 17. c 18. b 19. b 20. a
Test: Part 1
1. a 2. a 3. c 4. b 5. a
6. b 7. a 8. e 9. e 10. c
11. c 12. c 13. b 14. c 15. d
16. b 17. a 18. a 19. e 20. e
21. d 22. d 23. d 24. c 25. a
26. c 27. d 28. a 29. c 30. c
31. c 32. d 33. e 34. d 35. e
36. b 37. d 38. d 39. c 40. a
41. a 42. d 43. c 44. e 45. c
46. c 47. d 48. a 49. e 50. c
646 Answers to Quiz, Test, and Exam Questions
Chapter 9
1. c 2. c 3. a 4. c 5. d
6. d 7. a 8. b 9. c 10. b
11. d 12. b 13. b 14. d 15. d
16. a 17. c 18. c 19. d 20. a
Chapter 10
1. b 2. a 3. d 4. b 5. b
6. c 7. d 8. c 9. a 10. d
11. b 12. d 13. a 14. a 15. d
16. b 17. a 18. c 19. a 20. d
Chapter 11
1. d 2. a 3. a 4. a 5. c
6. d 7. b 8. a 9. d 10. d
11. b 12. c 13. b 14. a 15. b
16. c 17. d 18. a 19. b 20. b
Chapter 12
1. c 2. a 3. b 4. b 5. d
6. b 7. d 8. c 9. a 10. b
11. b 12. d 13. c 14. a 15. c
16. b 17. d 18. c 19. d 20. c
Chapter 13
1. c 2. a 3. b 4. d 5. c
6. a 7. b 8. c 9. d 10. c
11. d 12. d 13. a 14. b 15. d
16. b 17. d 18. c 19. b 20. a
Chapter 14
1. b 2. d 3. a 4. c 5. b
6. a 7. b 8. a 9. a 10. d
11. c 12. b 13. b 14. b 15. c
16. b 17. c 18. d 19. a 20. c
Answers to Quiz, Test, and Exam Questions 647
Chapter 15
1. b 2. b 3. a 4. d 5. b
6. c 7. a 8. c 9. d 10. a
11. a 12. a 13. c 14. a 15. d
16. b 17. d 18. c 19. c 20. b
Chapter 16
1. b 2. a 3. d 4. d 5. d
6. b 7. c 8. c 9. a 10. c
11. b 12. b 13. a 14. b 15. b
16. d 17. c 18. a 19. b 20. a
Chapter 17
1. c 2. c 3. a 4. d 5. a
6. b 7. c 8. d 9. b 10. c
11. c 12. a 13. d 14. a 15. c
16. b 17. d 18. d 19. c 20. a
Chapter 18
1. c 2. a 3. d 4. b 5. b
6. a 7. c 8. d 9. a 10. d
11. b 12. b 13. c 14. d 15. c
16. a 17. c 18. d 19. b 20. b
Test: Part 2
1. e 2. e 3. a 4. a 5. e
6. d 7. c 8. d 9. a 10. e
11. c 12. a 13. d 14. c 15. c
16. e 17. e 18. d 19. c 20. b
21. b 22. d 23. c 24. c 25. e
26. c 27. b 28. a 29. e 30. c
31. a 32. a 33. a 34. a 35. b
36. e 37. c 38. d 39. c 40. b
41. b 42. c 43. c 44. c 45. d
46. d 47. e 48. e 49. a 50. a
648 Answers to Quiz, Test, and Exam Questions
Chapter 19
1. b 2. d 3. c 4. a 5. c
6. a 7. d 8. b 9. c 10. b
11. d 12. b 13. b 14. a 15. b
16. c 17. a 18. c 19. d 20. c
Chapter 20
1. b 2. d 3. c 4. b 5. a
6. a 7. d 8. c 9. b 10. d
11. b 12. a 13. c 14. a 15. c
16. d 17. b 18. a 19. c 20. a
Chapter 21
1. c 2. d 3. b 4. a 5. b
6. c 7. a 8. b 9. d 10. c
11. a 12. d 13. d 14. b 15. c
16. a 17. c 18. b 19. a 20. c
Chapter 22
1. d 2. a 3. b 4. d 5. d
6. c 7. b 8. c 9. b 10. d
11. c 12. a 13. c 14. d 15. a
16. d 17. b 18. c 19. b 20. b
Chapter 23
1. b 2. d 3. a 4. b 5. c
6. a 7. b 8. c 9. d 10. b
11. c 12. a 13. d 14. a 15. c
16. d 17. b 18. c 19. a 20. a
Chapter 24
1. a 2. b 3. b 4. c 5. d
6. c 7. d 8. c 9. d 10. b
11. c 12. b 13. d 14. c 15. c
16. d 17. b 18. a 19. b 20. c
Answers to Quiz, Test, and Exam Questions 649
Chapter 25
1. c 2. c 3. c 4. c 5. a
6. d 7. b 8. a 9. c 10. d
11. b 12. a 13. a 14. b 15. d
16. a 17. a 18. c 19. a 20. d
Chapter 26
1. b 2. a 3. b 4. c 5. c
6. a 7. d 8. d 9. a 10. d
11. c 12. a 13. a 14. d 15. a
16. d 17. c 18. d 19. b 20. c
Test: Part 3
1. e 2. b 3. a 4. c 5. a
6. c 7. a 8. e 9. e 10. d
11. d 12. e 13. c 14. c 15. d
16. c 17. c 18. e 19. a 20. d
21. c 22. e 23. a 24. c 25. d
26. a 27. b 28. e 29. a 30. b
31. c 32. c 33. b 34. b 35. a
36. d 37. a 38. b 39. b 40. e
41. c 42. a 43. d 44. b 45. a
46. b 47. b 48. c 49. e 50. b
Chapter 27
1. b 2. a 3. b 4. d 5. c
6. a 7. b 8. d 9. c 10. b
11. c 12. b 13. d 14. a 15. b
16. a 17. d 18. c 19. c 20. d
Chapter 28
1. c 2. c 3. a 4. d 5. b
6. d 7. c 8. a 9. d 10. c
11. a 12. c 13. b 14. a 15. c
16. a 17. c 18. d 19. d 20. b
650 Answers to Quiz, Test, and Exam Questions