GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- II (New) EXAMINATION — WINTER 2019
Subject Code: 3134104 Date: 3/12/2019
Subject Name: Electronic Devices and Circuits
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Marks | |
|---|---|
| Q.1 (a) Explain the function of LED with neat sketch. | 03 |
| (b) Explain p and n semiconductor formation in detail. | 04 |
| (c) Differentiate FET and BJT. | 07 |
| Q.2 (a) List the two types of carriers and name the type of impurity that causes each to be a majority carrier. | 03 |
| (b) With help of voltage doubler circuit, describe the action of voltage multipliers. | 04 |
| (c) Draw and explain bridge rectifier circuit with capacitor filter. | 07 |
| OR | |
| (c) Draw and explain series and shunt positive clipper with output waveforms. | 07 |
| Q.3 (a) Explain Transistor as a switch. | 03 |
| (b) With the help of neat figure, explain the operation of a N-P-N transistor. | 04 |
| (c) Determine the output waveform for the sinusoidal input of figure given below. | 07 |
| OR | |
| Q.3 (a) Draw V-I characteristics of Zener diode. | 03 |
| (b) Drive the relation between dc alpha and dc beta for bipolar junction transistor. | 04 |
| (c) Explain Darlington pair in detail. Also derive its current gain. | 07 |
| Q.4 (a) Draw and explain the input and output characteristics of common emitter configuration. | 03 |
| (b) Explain the JFET application as analog switch. | 04 |
| (c) Draw the basic construction of a p-channel JFET and explain its operation in detail. | 07 |
| OR | |
| Q.4 (a) Compare E MOSFET with D MOSFET. | 03 |
| (b) Write the advantages and disadvantages of negative feedback. | 04 |
| (c) Explain Voltage Divider Bias biasing in detail. | 07 |
| Q.5 (a) What is the difference between a voltage amplifier and a power amplifier? | 03 |
| (b) Draw Ebers-Moll model and p-model of a transistor. | 04 |
| (c) Explain the working of a transformer coupled class A power amplifier and show the efficiency of class A transformer coupled amplifier is 50%. | 07 |
| OR | |
| Q.5 (a) Explain the difference between class B and class AB Operation. | 03 |
| (b) Draw a schematic of class B push-pull amplifier and explain its operation. | 04 |
| (c) Describe the characteristics of amplifiers, including classes of operation, types of coupling, and frequency ranges. | 07 |
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