# Floyd Self-test in Amplifier Frequency Response

(Last Updated On: December 8, 2017)

This is the Self-test in Chapter 10: Amplifier Frequency Response 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 10 Topic Outline

• Floyd Self-test in Basic Concepts of Amplifier Frequency Response
• Floyd Self-test in The Decibel
• Floyd Self-test in Low-Frequency Amplifier Response
• Floyd Self-test in High-Frequency Amplifier Response
• Floyd Self-test in Total Amplifier Frequency Response
• Floyd Self-test in Frequency Response of Multistage Amplifiers
• Floyd Self-test in Frequency Response Measurements

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. The low-frequency response of an amplifier is determined in part by

• (a) the voltage gain
• (b) the type of transistor
• (c) the supply voltage
• (d) the coupling capacitors

2. The high-frequency response of an amplifier is determined in part by

• (a) the gain-bandwidth product
• (b) the bypass capacitor
• (c) the internal transistor capacitances
• (d) the roll-off

3. The Miller input capacitance of an amplifier is dependent, in part, on

• (a) the input coupling capacitor
• (b) the voltage gain
• (c) the bypass capacitor
• (d) none of these

4. The decibel is used to express

• (a) power gain
• (b) voltage gain
• (c) attenuation
• (d) all of these

5. When the voltage gain is 70.7% of its midrange value, it is said to be

• (a) attenuated
• (b) down 6 dB
• (c) down 3 dB
• (d) down 1 dB

6. In an amplifier, the gain that occurs between the lower and upper critical frequencies is called the

• (a) critical gain
• (b) midrange gain
• (c) bandwidth gain
• (d) decibel gain

7. A certain amplifier has a voltage gain of 100 at midrange. If the gain decreases by 6 dB, it is equal to

• (a) 50
• (b) 70.7
• (c) 0
• (d) 20

8. The gain of a certain amplifier decreases by 6 dB when the frequency is reduced from 1 kHz to 10 Hz. The roll-off is

• (c) -3dB/octave
• (d) -6dB/octave

9. The gain of a particular amplifier at a given frequency decreases by 6 dB when the frequency is doubled. The roll-off is

• (c) -6dB/octave
• (d) answers (b) and (c)

10. The lower critical frequency of a direct-coupled amplifier with no bypass capacitor is

• (a) variable
• (b) 0 Hz
• (c) dependent on the bias
• (d) none of these

11. At the upper critical frequency, the peak output voltage of a certain amplifier is 10 V. The peak voltage in the midrange of the amplifier is

• (a) 7.07 V
• (b) 6.37 V
• (c) 14.14 V
• (d) 10 V

12. The high-frequency response of an amplifier is determined by the

• (a) coupling capacitors
• (b) bias circuit
• (c) transistor capacitances
• (d) all of these

13. The Miller input and output capacitances for a BJT inverting amplifier depend on

• (a) Cbc
• (b) βac
• (c) Av
• (d) answers (a) and (c)

14. The bandwidth of an amplifier is determined by

• (a) the midrange gain
• (b) the critical frequencies
• (c) the roll-off rate
• (d) the input capacitance

15. An amplifier has the following critical frequencies: 1.2 kHz, 950 Hz, 8 kHz, and 8.5 kHz. The bandwidth is

• (a) 7550 Hz
• (b) 7300 Hz
• (c) 6800 Hz
• (d) 7050 Hz

16. Ideally, the midrange gain of an amplifier

• (a) increases with frequency
• (b) decreases with frequency
• (c) remains constant with frequency
• (d) depends on the coupling capacitors

17. The frequency at which an amplifier’s gain is 1 is called the

• (a) unity-gain frequency
• (b) midrange frequency
• (c) corner frequency
• (d) break frequency

18. When the voltage gain of an amplifier is increased, the bandwidth

• (a) is not affected
• (b) increases
• (c) decreases
• (d) becomes distorted

19. If the fT of the transistor used in a certain amplifier is 75 MHz and the bandwidth is 10 MHz, the voltage gain must be

• (a) 750
• (b) 7.5
• (c) 10
• (d) 1

20. In the midrange of an amplifier’s bandwidth, the peak output voltage is 6 V. At the lower critical frequency, the peak output voltage is

• (a) 3 V
• (b) 3.82 V
• (c) 8.48 V
• (d) 4.24 V

21. The dominant lower critical frequency of a multistage amplifier is the

• (a) lowest fcl
• (b) highest fcl
• (c) average of all the fcl’s
• (d) none of these

22. When the critical frequencies of all of the stages are the same, the dominant critical frequency is

• (a) higher than any individual fcl
• (b) lower than any individual fcl
• (c) equal to the individual fcl’s
• (d) the sum of all individual fcl’s

23. In the step response of a noninverting amplifier, a longer rise time means

• (a) a narrower bandwidth
• (b) a lower fcl
• (c) a higher fcu
• (d) answers (a) and (b)