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Your Results for: "Multiple Choice" Print this page

Site Title: Electronic Devices and Circuit Theory

Book Author: Boylestad

Location on Site: Chapter 5 > Multiple Choice

Date/TimeSubmitted:

October 12, 2012 at 12:36 AM (UTC/GMT)

Summary of Results

23% Correct of 39 Scored items:

9 Correct: 23%

30 Incorrect: 77%

More information about scoring

1. Which of the following techniques can be used in the sinusoidal ac analysis of transistornetworks?

Your Answer: Small-signal

Correct Answer: Small- or large-signal

2. What is the limit of the efficiency defined by = Po / Pi?

Your Answer: Greater than 1

Correct Answer: Less than 1

3. Which of the following define(s) the conversion efficiency?

Your Answer: Ac power to the load/ac input power

Correct Answer: Ac power to the load/dc power supplied

4. Which of the following should be done to obtain the ac equivalent of a network?

Your Answer: Set all dc sources to zero

Correct Answer: All of the above

5. The _____ model suffers from being limited to a particular set of operating conditions if it is tobe considered accurate.

Your Answer:

Correct Answer: hybrid equivalent

6. The _____ model fails to account for the output impedance level of the device and thefeedback effect from output to input.

Your Answer:

Correct Answer: re

7. Which of the following is (are) true regarding the input impedance for frequencies in themidrange 100 kHz of a BJT transistor amplifier?

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Your Answer: An ohmmeter cannot be used to measure the small-signal ac inputimpedance.

Correct Answer: All of the above

8. Which of the following is (are) true regarding the output impedance for frequencies in themidrange 100 kHz of a BJT transistor amplifier?

Your Answer: An ohmmeter cannot be used to measure the small-signal ac outputimpedance.

Correct Answer: All of the above

9. What is the range of the current gain for BJT transistor amplifiers?

Your Answer: above 100

Correct Answer: All of the above

10. The input impedance of a BJT amplifier is purely _____ in nature and can vary from a few_____ to _____.

Your Answer: capacitive, microfarads, farads

Correct Answer: resistive, ohms, megohms

11. For BJT amplifiers, the _____ gain typically ranges from a level just less than 1 to a level thatmay exceed 1000.

Your Answer: current

12. What is the unit of the parameter ho?

Your Answer: Ohm

Correct Answer: Siemen

13. Which of the h-parameters corresponds to re in a common-base configuration?

Your Answer: hfb

Correct Answer: hib

14. What is the range of the input impedance of a common-base configuration?

Your Answer: 100 k to 500 k

Correct Answer: A few ohms to a maximum of 50

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15. What is the typical value of the current gain of a common-base configuration?

Your Answer: Between 100 and 200

Correct Answer: Less than 1

16. What is the controlling current in a common-base configuration?

Your Answer: Ib

Correct Answer: Ie

17. What is the typical range of the output impedance of a common-emitter configuration?

Your Answer: 40 k to 50 k

18. Under which of the following conditions is the output impedance of the networkapproximately equal to RC for a common-emitter fixed-bias configuration?

Your Answer: ro > ro

Correct Answer: ro 10RC

19. Under which of the following condition(s) is the current gain ?

Your Answer: ro 10RC and RB 10re

20. What does the negative sign in the voltage gain of the common-emitter fixed-biasconfiguration indicate?

Your Answer: Gain is larger than 1.

Correct Answer: The output and input voltages are 180º out of phase.

21. For the common-emitter fixed-bias configuration, there is a _____ phase shift between theinput and output signals.

Your Answer: 90º

Correct Answer: 180º

22. Which of the following configurations has an output impedance Zo equal to RC?

Your Answer: Common-emitter voltage-divider without bypass capacitor

Correct Answer: All of the above

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23. Which of the following configurations has a voltage gain of –RC /re?

Your Answer: Fixed-bias common-emitter and voltage-divider with bypass capacitor

24. Which of the following configurations has the lowest output impedance?

Your Answer: Emitter-follower

25. The _____ configuration is frequently used for impedance matching.

Your Answer: emitter-follower

26. The emitter-follower configuration has a _____ impedance at the input and a _____impedance at the output.

Your Answer: high, low

27. Which of the following gains is less than 1 for a common-base configuration?

Your Answer: Ap

Correct Answer: Ai

28. Which of the following conditions must be met to allow the use of the approximate approachin a voltage-divider bias configuration?

Your Answer: RE < 10R2

Correct Answer: re < 10R2

29. Which one of the following configurations has the lowest input impedance?

Your Answer: Common-base

30. For the collector dc feedback configuration, there is a _____ phase shift between the inputand output signals.

Your Answer: 45º

Correct Answer: 180º

31. Which of the following represent(s) the advantage(s) of the system approach over the r-model approach?

Your Answer: Thevenin's theorem can be used.

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Correct Answer: All of the above

32. The loaded voltage gain of an amplifier is always more than the no-load level.

Your Answer: True

Correct Answer: False

33. The smaller the level of RL, the larger the level of ac voltage gain.

Your Answer: True

Correct Answer: False

34. Which of the following is (are) true to achieve a good overall voltage gain for the circuit?

Your Answer: The effect of Rs and RL must be considered as a product.

Correct Answer: The effect of Rs and RL must be considered as a product and evaluated

individually.

35. The _____ the source resistance and/or _____ the load resistance, the less the overall gainof an amplifier.

Your Answer: smaller, smaller

Correct Answer: larger, smaller

36. The current gain for the Darlington connection is _____.

Your Answer:

Correct Answer:

37. What is the voltage gain of a feedback pair connection?

Your Answer: 1

38. Which of the following is referred to as the reverse transfer voltage ratio?

Your Answer: hi

Correct Answer: hr

39. In an unbypassed emitter bias configuration hie replaces _____ in the re model.

Your Answer: re

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Correct Answer: re

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