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# Floyd Self-test in Power Amplifiers

This is the Self-test in Chapter 7: Power Amplifiers from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

#### Floyd Self-test Chapter 7 Topic Outline

• Floyd Self-test in Power Amplifiers
• Floyd Self-test in Class A Power Amplifier
• Floyd Self-test in Class B Power Amplifier
• Floyd Self-test in The Class B and Class AB Push-Pull Amplifiers
• Floyd Self-test in Class C Power Amplifier

If you are looking for the Multiple Choice Questions in Floyd’s Electronic Devices proceed to

#### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. An amplifier that operates in the linear region at all times is

(a) Class A

(b) Class AB

(c) Class B

(d) Class C

Solution:

2. A certain class A power amplifier delivers 5 W to a load with an input signal power of 100 mW. The power gain is

(a) 100

(b) 50

(c) 250

(d) 5

Solution:

3. The peak current a class A power amplifier can deliver to a load depends on the

(a) maximum rating of the power supply

(b) quiescent current

(c) current in the bias resistors

(d) size of the heat sink

Solution:

4. For maximum output, a class A power amplifier must maintain a value of quiescent current that is

(a) one-half the peak load current

(b) twice the peak load current

(c) at least as large as the peak load current

(d) just above the cutoff value

Solution:

5. A certain class A power amplifier has The maximum signal power output is

(a) 6 W

(b) 12 W

(c) 1 W

(d) 0.707 W

Solution:

6. The efficiency of a power amplifier is the ratio of the power delivered to the load to the

(a) input signal power

(b) power dissipated in the last stage

(c) power from the dc power supply

Solution:

7. The maximum efficiency of a class A power amplifier is

(a) 25%

(b) 50%

(c) 79%

(d) 98%

Solution:

8. The transistors in a class B amplifier are biased

(a) into cutoff

(b) in saturation

(c) at midpoint of the load line

(d) right at cutoff

Solution:

9. Crossover distortion is a problem for

(a) class A amplifiers

(b) class AB amplifiers

(c) class B amplifiers

(d) all of these amplifiers

Solution:

10. A BJT class B push-pull amplifier with no transformer coupling uses

(a) two npn transistors

(b) two pnp transistors

(c) complementary symmetry transistors

(d) none of these

Solution:

11. A current mirror in a push-pull amplifier should give an ICQ that is

(a) equal to the current in the bias resistors and diodes

(b) twice the current in the bias resistors and diodes

(c) half the current in the bias resistors and diodes

(d) zero

Solution:

12. The maximum efficiency of a class B push-pull amplifier is

(a) 25%

(b) 50%

(c) 79%

(d) 98%

Solution:

13. The output of a certain two-supply class B push-pull amplifier has a VCC of 20 V. If the load resistance is the value of Ic(sat) is

(a) 5 mA

(b) 0.4 A

(c) 4 mA

(d) 40 mA

Solution:

14. The maximum efficiency of a class AB amplifier is

(a) higher than a class B

(b) the same as a class B

(c) about the same as a class A

(d) slightly less than a class B

Solution:

15. The power dissipation of a class C amplifier is normally

(a) very low

(b) very high

(c) the same as a class B

(d) the same as a class A

Solution:

16. The efficiency of a class C amplifier is

(a) less than class A

(b) less than class B

(c) less than class AB

(d) greater than classes A, B, or AB

Solution:

17. The transistor in a class C amplifier conducts for

(a) more than 180 degree of the input cycle

(b) one-half of the input cycle

(c) a very small percentage of the input cycle

(d) all of the input cycle

Solution:

### Complete List of Floyd Self-test in Electronic Devices

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