University of Mumbai 2007-4th Sem B.E Electrical and Electronics Engineering Electronic Circuits - Question Paper
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CV&L-* J &I-C C/y tuxh (REVISED COURSE)  J04 :1rftf07 Con. 2321-07. (3 Hours) |
klPft ND'9386 [Total Marks : 100 |
N.B. (1) Question No. 1 is compulsory.
(2) Answer any four out of remaining six questions.
(3) Assume any suitable data wherever required but justify the same.
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(4) FTgures tathe right Indicate marks. . . \
1. Explain trie following . >
(a) General characteristics of negative feedback amplifiers
(b) Secord and higher harmonic distortion
(c) Resonant circuit oscillators
(d) Explain basic block diagram of operational amplifier
(b) Basic characteristics of practical operational amplifiers.
2. (a) If two cascaded stages have very unequal bandpasses, show that the combined bandwidth is esssentially that of the smaller.
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12
(b) Calculate the voltage gain, output voltage, input impedance, and output impedance for the cascade BJT amplifier shown figure. Calculate the output voltage resulting if 10 KO load is connected to the output.
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3. |
(a) |
Draw UJT relaxation oscillator and explain its operation. Derive the expression for output frequency ? |
10 |
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(b) |
Oorivo Ad1 R, and R0 for DIDO differential amplifier using BJTs. |
10 | |
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4. |
(a) |
Derive the condition and frequency of oscillation of fi-C phase shift BJT amplifier. |
10 |
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(b> |
LC osciUalors Vs. Crystal oscillators. |
10 | |
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5. |
(a) |
Class A large-signal amplifiers Vs. Transformer coupled audio power amplifier. |
10 |
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<b) |
Draw and explain class B push-pull amplifier ? What are advantages of a push-pull system. |
10 | |
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6. |
(a) |
Effects of negative feedback on amplifier stability, bandwidth, non-linear dislortion, input impedance and output impedance. |
10 |
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(b) |
Identify the type of leedback and amplifier. Derive expression for R(t, A and R. |
10 |
7, (a) Explain the working and also derive the necessary output equation 10
(i) Sibtractor circuit using OP-Amp
(ii) Logarithmic amplifier circuit using OP-Amp.
(b) (i) Millers effect and frequency response. 10
(ii) Darlington pair and its application.
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Attachment: |
| Earning: Approval pending. |
