# Practice Quiz in Power Amplifiers Part 2

Online Practice Quiz in Power Amplifiers part 2 from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad.

This is the Online Practice Quiz in Power Amplifiers Part 2 from the book, Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Continue Part II of the Online Practice Quiz

#### Quiz in Power Amplifiers

Question 11. In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?

A. 0.5

B. 0.636

C. 0.707

D. 1

Question 12. Categorize the power efficiency of each class of amplifier, from worst to best.

A. A, B, AB, D

B. A, AB, D, B

C. A, AB, B, D

D. None of these

Question 13. Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?

A. It needs two separate voltage sources.

B. There is crossover distortion in the output signal.

C. It does not provide exact switching of one transistor off and the other on at the zero-voltage condition.

D. All of these

Question 14. Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16 â„¦.

A. 78.54%

B. 75%

C. 70.69%

D. 50%

Question 15. Calculate the harmonic distortion component for an output signal having fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V.

A. 3.83%

B. 38.3%

C. 83.3%

D. 8.33%

Question 16. Calculate the efficiency of a transformer-coupled class A amplifier for a supply of 15 V and an output of V(p) = 10 V.

A. 25%

B. 33.3%

C. 50%

D.78.5%

Question 17. nMOS and pMOS transistors can be used for class B.

A. True

B. False

Question 18. Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ÂºC) if derating is required above 25ÂºC by a derating factor of 0.6 W/ÂºC at a case temperature of 100Âº.

A. 25 W

B. 30 W

C. 35 W

D. 40 W

Question 19. A silicon power transistor is operated with a heat sink (Î¸SA = 1.5ÂºC/W). The transistor, rated at 150 W (25ÂºC), has Î¸JC = 0.5Âº C/W, and the mounting insulation has Î¸CS = 0.6 ÂºC/W. What is the maximum power that can be dissipated if the ambient temperature is 50ÂºC and TJmax = 200 ÂºC?

A. 61.5 W

B. 60.0 W

C. 57.7 W

D. 55.5 W

Question 20. How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?

A. 0

B. 1

C. 2

D. 3

### More Practice Quiz in Power Amplifiers

Practice Quiz Part 1

Practice Quiz Part 2

Practice Quiz Part 3

Practice Quiz Part 4

Practice Quiz Part 5

Practice Quiz Part 6

### See: Complete List of Practice Quizzes

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