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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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