GTU BE 2019 Summer Question Papers || Gujarat Technological University
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Subject Code: 131101
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III(OLD) EXAMINATION - SUMMER 2019
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Date:07/06/2019
Subject Name: Basic Electronics
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Time: 02:30 PM TO 05:00 PM
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) Draw the circuit diagram of full wave bridge rectifier and draw its input and output waveforms. Also derive the expression for the D.C. current. | 07 |
| (b) Explain Hall effect. Derive expression of Hall voltage and state its applications. | 07 | |
| Q.2 | (a) State the role of voltage regulators in power supplies? Discuss working of a series voltage regulator. | 07 |
| (b) How does the designer minimize the percentage variation in Ic , due to Variation in Ico and Vgg and due to variation in ß in transistor amplifier circuit. | 07 | |
| OR | ||
| (b) Prove that current density is proportional to product of charge density, mobility of charge and electric field intensity. | 07 | |
| Q.3 | (a) Draw the circuit of CE configuration of transistor. Explain Input and output characteristics. Also derive a = ß/(1 + ß) | 07 |
| (b) Explain the h-parameter model of CE amplifier with Bypass resistor Re and derive the expression for Ai, Av, Ri, Ro | 07 | |
| OR | ||
| (a) What is biasing? Why biasing is required for transistor? List biasing methods for transistor. Draw and explain the circuit of voltage divider biasing | 07 | |
| Q.4 | (a) Draw circuit of an idealized class-B push-pull power amplifier and explain its operation with the help of necessary waveforms. | 07 |
| (b) Explain the different types of clipping circuits. | 07 | |
| OR | ||
| (a) Explain DC load line and Q-point for any transistor configuration. Also state the necessity of biasing. | 07 | |
| Q.5 | (a) Explain the principle of operation of JFET. Also compare FET with BJT. | 07 |
| (b) Explain with the help of circuit diagram the working of Tunnel Diode in detail. | 07 | |
| OR | ||
| (a) State the limitations of Rutherford model and explain Bohr atomic model. | 07 | |
| (b) Briefly discuss the term mobility in connection to charged carriers and derive equation for point form of Ohm’s law. | 07 | |
| OR | ||
| (a) Explain in detail the base-width modulation or ‘early effect’ for common-base configured transistor and draw its output and input characteristics. | 07 | |
| (b) Define and prove the Miller’s theorem and its dual alternative | 07 | |
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