# Practice Quiz in Power Amplifiers Part 3

Online Practice Quiz in Power Amplifiers part 3 from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad.

This is the Online Practice Quiz in Power Amplifiers Part 3 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 III of the Online Practice Quiz

#### Quiz in Power Amplifiers

Question 21. The maximum efficiency of a transformer-coupled class A amplifier is _____.

A. 25%

B. 50%

C. 78.5%

D. 63.6%

Question 22. What is the maximum efficiency of a class B circuit?

A. 90%

B. 78.5%

C. 50%

D. 25%

Question 23. Which of the following is (are) power amplifiers?

A. Class A

B. Class B or AB

C. Class C or D

D. All of these

Question 24. Class AB operation is _____ operation.

A. similar to class A

B. similar to class B

C. similar to class C

D. None of these

Question 25. Calculate the effective resistance seen looking into the primary of a 20:1 transformer connected to an 8- â„¦ load.

A. 3.2 kâ„¦

B. 3.0 kâ„¦

C. 2.8 kâ„¦

D. 1.8 kâ„¦

Question 26. This is an example of the output swing for a class _____ amplifier.

A. A

B. B

C. AB

D. C

E. D

Question 27. Which of the following transistors has been quite popular as the driver device for class D amplification?

A. BJT

B. FET

C. UJT

D. MOSFET

Question 28. What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?

A. 90%

B. 78.5%

C. 50%

D. 25%

Question 29. By how much does the output signal vary for a class AB power amplifier?

A. 360Âº

B. 180Âº

C. Between 180Âº and 360Âº

D. Less than 180Âº

Question 30. Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?

A. Digital multimeter

B. Spectrum analyzer

C. Oscilloscope

D. Wave analyzer

### 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

Note: After taking this particular quiz, you can proceed to check all the topics.

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