EC8452 Question Bank Electronic Circuits 2
EC8452 Question Bank Electronic Circuits 2 Regulation 2017 Anna University free download. Electronic Circuits 2 Question Bank EC8452 pdf free download.
Sample EC8452 Question Bank Electronic Circuits 2
1. Write a brief note on expressions for gain with positive and negative feedback. (13)
2. List the effects of negative feedback on stability, distortion, noise, input and output impedance of a feedback amplifier. (13)
3. (i) Identify the effect of negative feedback on the bandwidth and
harmonic distortion of an amplifier. (7)
(ii) A negative feedback amplifier has an open loop gain of 60000 and a closed loop gain of 300. If the open loop upper cut off frequency is 15KHz, Choose the closed loop upper cutoff frequency. Also, calculate the total harmonic distortion with feedback if there is 10% harmonic distortion without feedback. (6) EC8452 Question Bank Electronic Circuits 2
4. (i) A voltage-series negative feedback amplifier has a voltage gain without feedback of A = 500, input resistance Ri = 3kΩ, output resistance Ro = 20kΩ and feedback ratio β = 0.01. Find the voltage gain Af, input resistance Rif and output resistance Rof of the amplifier with feedback. (7)
(ii) The current-series feedback types of transistor amplifier for the given circuit diagram has the following parameters such as Rs=1KΩ, RL = 1KΩ Re = 100Ω hfe = 80 and hie = 2kΩ. show 𝐺𝑀, β, 𝐺𝑀𝑓, Rif, 𝑅𝑜𝑓. (6) EC8452 Question Bank Electronic Circuits 2
5. An amplifier, without feedback, has a voltage gain of 500, lower cut-off frequency f1 = 100 Hz, upper cut-off frequency f2 = 250 KHz and a distortion of 10%. Calculate the amplifier voltage gain, lower cut-off frequency and upper cut-off frequency and distortion, sensitivity, desensitivity and bandwidth when a negative feedback is applied with feedback ratio of 0.01. EC8452 Question Bank Electronic Circuits 2
6. Explain the effect of a current series feedback on input and output resistance of a BJT amplifier. Explain the same, with necessary circuit, equivalent circuit and equations.
| Subject name | Electronic Circuits 2 |
| Semester | 4 |
| Subject Code | EC8452 |
| Regulation | 2017 regulation |
EC8452 Question Bank Electronic Circuits 2 Click Here To Download
EC8452 Syllabus Electronic Circuits 2
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