ANALOG ELECTRONICS 2022 Question Paper — Government College of Engine…
The 2022 ANALOG ELECTRONICS previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: ANALOG ELECTRONICS
- Course: ANALOG ELECTRONICS
- Branch: Electrical Engg.
- Year: 2022
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all.
- Select at least two questions from each section.
- Use of calculator is allowed.
- Assume reasonable data, wherever missing.
Questions
Section-A
- Q1. What is the need of a power amplifier ? Differentiate between a power amplifier and a voltage amplifier. Draw the transformer coupled Audio power Amplifier and explain its operation. Prove that the max. conversion efficiency in class A amplifier is 50%. A transistor supplies 2 W for a 5 k$\Omega$ load. The zero signal dc current is 35 mA and it rises to 40 mA, when the signal is applied. Determine the %age 2nd harmonic distortion. [20 marks]
- Q2. Why distortion present in power amplifiers ? Explain the various types of distortions and their sources in power amplifiers. Draw and explain push-pull amplifier (class-A mode). What are its advantages and disadvantages ? A transformer coupled class A power Amplifier has max and min values of collector emitter voltage of 25V and 2.5V respectively. Determine its collecter efficiency. [20 marks]
- Q3. List the four characteristics of three terminal IC regulators. Design a current source using 7805 to supply a current of 1.0 A to a 10 $\Omega$, 10 W load. How can LM317 be used to provide various voltage options of output voltage in a regulator ? Explain design an adjustable voltage regulator to satisfy the following specifications. Output voltage $V_0$ = 12 to 15V Output Current $I_0$ = 1.0A [20 marks]
- Q4. Draw a series voltage regulator using emitter follower and explain its operation. Draw and explain the short circuit protection circuit used in such regulator. Explain the performance parameters of 78XX regulators. [20 marks]
Section-B
- Q5. Explain the following specifications of D/A converters : (i) Accuracy (ii) Offset voltage and gain error (iii) Linearity (iv) Resolution (v) Settling time (vi) Monotonicity (vii) Temperature sensitivity. With circuit diagram, explain a 4-bit weighted resistor D/A converter. [20 marks]
- Q6. Draw the differential amplifer using single OP-Amp and derive an expression for its differential gain 'Ad'. Write the characteristics of ideal and practical OP-Amp. What is CMRR ? Explain its significance. [20 marks]
- Q7. How can OP-Amp be used as summing and averaging amplifiers using non-inverting configuration ? Explain with necessary derivations. Find the output voltage '$V_0$' of the circuit of Fig. 1 Assume OP-Amp is 741. [20 marks]
- Q8. Draw and explain OP-Amp as differentiator. What do you mean by an active filter ? Explain the various types of filter responses. Draw and explain 2nd order HP filter. [20 marks]