boylestad electronics multiple choice q&a chapter (1)
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Transcript of boylestad electronics multiple choice q&a chapter (1)
Your Results for: "Multiple Choice" Print this page
Site Title: Electronic Devices and Circuit Theory
Book Author: Boylestad
Location on Site: Chapter 1 > Multiple Choice
Date/TimeSubmitted:
August 18, 2012 at 10:51 AM (UTC/GMT)
Summary of Results
31% Correct of 35 Scored items:
11 Correct: 31%
24 Incorrect: 69%
More information about scoring
1. How many terminals does a diode have?
Your Answer: 1
Correct Answer: 2
2. What is the resistor value of an ideal diode in the region of conduction?
Your Answer: 0
3. What is the state of an ideal diode in the region of nonconduction?
Your Answer: An open circuit
4. The diode _____.
Your Answer: is the simplest of semiconductor devices
Correct Answer: All of the above
5. The ideal diode is a(n) _____ circuit in the region of nonconduction.
Your Answer: open
6. Which of the following is an atom composed of?
Your Answer: Electrons
Correct Answer: All of the above
7. How many orbiting electrons does the germanium atom have?
Your Answer: 4
Correct Answer: 32
8. How many valence electrons does a silicon atom have?
Your Answer: 1
Correct Answer: 4
9. One eV is equal to _____ J.
Your Answer: 6.02 × 1023
Correct Answer: 1.6 × 10–19
10. Which of the following elements is most frequently used for doping pure Ge or Si?
Your Answer: Boron
Correct Answer: All of the above
11. The diffused impurities with _____ valence electrons are called donor atoms.
Your Answer: 4
Correct Answer: 5
12. In what state is a silicon diode if the voltage drop across it is about 0.7 V?
Your Answer: No bias
Correct Answer: Forward bias
13. What unit is used to represent the level of a diode forward current IF?
Your Answer: pA
Correct Answer: mA
14. Which of the following ratings is true?
Your Answer: Si diodes have higher PIV and narrower temperature ranges than Gediodes.
Correct Answer: Si diodes have higher PIV and wider temperature ranges than Ge diodes.
15. It is not uncommon for a germanium diode with an Is in the order of 1–2 A at 25°C to have
leakage current of 0.1 mA at a temperature of 100°C.
Your Answer: True
16. Calculate static resistance RD of a diode having ID = 30 mA and VD = 0.75 V.
Your Answer: 25
17. Calculate ID if RD = 30 and VD = 0.84 V.
Your Answer: 28 mA
18. Refer to Figure 1.27. Calculate the dynamic resistance rd of a diode having ID = 27.5 mA.
Your Answer: 0
Correct Answer: 2
19. Determining rd to a high degree of accuracy from a characteristic curve is very accurate.
Your Answer: True
Correct Answer: False
20. The _____ diode model is employed most frequently in the analysis of electronic systems.
Your Answer: ideal device
Correct Answer: simplified
21. Calculate the power dissipation of a diode having ID = 40 mA.
Your Answer: 28 mW
22. Which capacitance dominates in the reverse-bias region?
Your Answer: depletion
23. Which capacitance dominates in the forward-bias region?
Your Answer: Diffusion
24. At what kind of operating frequency diffusion or transition is a capacitor represented inparallel with the ideal diode?
Your Answer: Low frequency
Correct Answer: Very high frequency
25. What is the value of the transition capacitance for a silicon diode when VD = 0? (Choose the
best answer.)
Your Answer: 1 pF
Correct Answer: 3 pF
26. Which of the following devices can check the condition of a semiconductor diode?
Your Answer: Digital display meter (DDM)
Correct Answer: All of the above
27. What does a high resistance reading in both forward- and reverse-bias directions indicate?
Your Answer: A good diode
Correct Answer: An open diode
28. The condition of a semiconductor diode can be determined quickly using a _____.
Your Answer: DDM
Correct Answer: Any of the above
29. Determine the nominal voltage for the Zener diode at a temperature of 120° C if the nominalvoltage is 5.1 volts at 25° C and the temperature coefficient is 0.05%/° C.
Your Answer: 4.6 V
Correct Answer: 5.34 V
30. Calculate the temperature coefficient in %/° C of a 10-V nominal Zener diode at 25° C if thenominal voltage is 10.2 V at 100° C.
Your Answer: 0.0238
Correct Answer: 0.0267
31. In which of the following color(s) is (are) LEDs presently available?
Your Answer: Yellow
Correct Answer: All of the above
32. What is the maximum power rating for LEDs?
Your Answer: 150 mW
33. In which of the following is the light intensity measured?
Your Answer: Candela
34. What is the range of the operating voltage level for LEDs?
Your Answer: 5–12 mV
Correct Answer: 1.7–3.3 V
35. In general, LEDs operate at voltage levels from _____ V to _____ V.
Your Answer: 1.0, 3.0
Correct Answer: 1.7, 3.3
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