Amplifier Frequency Response Questions and Answers
Amplifier Frequency Response questions with answers help students understand how amplifiers behave across different frequencies. This topic is essential in electronics aptitude questions and answers with explanations, especially for competitive exams like GATE, ISRO, DRDO, and ECIL. The frequency response defines the amplifier’s ability to amplify signals within a specific frequency range while maintaining consistent gain. Understanding this helps in designing stable electronic circuits and predicting their performance in real-world applications. By practicing aptitude test questions with solutions PDF or online, learners can strengthen their knowledge of bandwidth, gain roll-off, and frequency characteristics, which are critical in both academic and placement tests.
Amplifier Frequency Response
11. An RC network has a roll-off of 20 dB per decade. What is the total attenuation between the output voltage in the midrange of the passband as compared to the output voltage at a frequency of 10 times fc?
- –3 dB
- –20 dB
- –23 dB
- –43 dB
12. It is often convenient in amplifiers to assign a certain value of gain as the ________ dB reference.
- 0
- 1
- 6
- 10
13. For low-frequency response, all RC circuits in an amplifier may not have the same critical frequency. Which RC response will determine the critical frequency of the amplifier?
- the lowest frequency
- the center frequency
- the highest frequency
- the bypass frequency
14. A ten-times change in frequency is called a(n)
- octave.
- decade.
- decimal.
- none of the above
15. An amplifier has an output voltage of 7.6 V p-p at the midpoint of the frequency range. What is the output at fc?
- 3.8 V p-p
- 3.8 Vrms
- 5.4 Vrms
- 5.4 V p-p
16. The frequency response of an amplifier can be determined using the step response method, and measuring the output rise/fall times between
- 0% and 100% response.
- 10% and 90% response.
- 25% and 75% response.
- five time constant responses.
17. In a multistage amplifier, the overall frequency response is determined by the
- frequency response of each stage depending on the relationships of the critical frequencies.
- frequency response of the first amplifier.
- frequency response of the last amplifier.
- lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier.
18. What term means that the midrange voltage gain is assigned a value of 1 (or 0 dB)?
- critical
- Miller
- normalized
- corner
19. An RC network has values of R = 1.2 k and C = 0.22 F. Find fc.
- 3.79 kHz
- 1.89 kHz
- 603 Hz
- 60 Hz
20. Halving the power corresponds to a ________ dB ________.
- 3, decrease
- 10, decrease
- 3, increase
- 10, increase