GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Name: Electronic Devices and Circuits
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION - WINTER 2018
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Subject Code: 2131006 Date: 01/12/2018Subject Name: Electronic Devices and Circuits
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | |
|---|---|
| Q.1 | |
| (a) Define Semiconductor. Explain the Formation of P-type Semiconductor. | 03 |
| (b) Explain AC and DC Resistances for Diode. | 04 |
| (c) Draw and explain bridge rectifier circuit with capacitor filter. | 07 |
| Q.2 | |
| (a) Compare Zener Diode and PN junction Diode. | 03 |
| (b) With the help of neat figure, explain the operation of a N-P-N transistor. | 04 |
| (c) A full-wave rectifier circuit is fed from a transformer having a centre-tapped secondary winding. The rms voltage from either end of secondary to center tap is 30V. If the diode forward resistance is 2 O and that of the half secondary is 8 O, for a load of 1 KO, calculate (1) Power delivered to load (2) % Regulation at full load --- Content provided by FirstRanker.com --- (3) Efficiency of rectification(4) TUF of secondary. | 07 |
| OR | |
| (c) Analyze the given circuit and sketch the nature of its output voltage. Assume silicon diode with cut in voltage 0.6V. [Circuit Diagram Description: A voltage source Vi is connected to a series circuit. The circuit contains a resistor and a diode. The output voltage is measured across the diode.] | 07 |
| Q.3 | |
| (a) Explain Transistor as a switch. | 03 |
| (b) Draw a fixed bias circuit, write the advantages and disadvantages of fixed bias circuit. | 04 |
| (c) Draw the base biased amplifier circuit and explain its operation. | 07 |
| OR | |
| Q.3 | |
| (a) Explain DC load line and Q-point for any transistor Configuration. | 03 |
| (b) Define following terms. (1) Surge current (2) Drift Current (3) Pinch off voltage (4) Ripple Factor | 04 |
| (c) For the Circuit given below, Ic=2mA, ß=100, calculate Rb, Vce and stability factor S. [Circuit Diagram Description: A transistor circuit with a resistor Rb connected to the base, a resistor Rc connected to the collector, and a voltage source Vcc. The values of Ic and ß are given.] | 07 |
| Q.4 | |
| (a) State and Describe Miller’s Theorem | 03 |
| (b) Discuss the working of a series voltage Regulator. | 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.4 | |
| (a) Explain the effect of coupling and bypass capacitors on the bandwidth. | 03 |
| (b) Compare different types of power amplifier based on conduction angle, position of Q-point, efficiency and distortion. | 04 |
| (c) Define Voltage Regulation. Explain working of two transistor Regulator. | 07 |
| Q.5 | |
| (a) Explain Principal of operation of Photodiode. | 03 |
| (b) Write the advantages and disadvantages of negative feedback. | 04 |
| (c) Explain construction, operation and characteristic of P-channel Enhancement type MOSFET in detail. | 07 |
| OR | |
| Q.5 | |
| (a) If the base current in a transistor is 20uA when the emitter current is 6.4mA, calculate the values of a and ß. Also calculate the collector current. | 03 |
| (b) Differentiate Ohmic region and Saturation region of JFET | 04 |
| (c) Derive the expression of the input resistance with feedback for voltage shunt feedback amplifier. | 07 |
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