Download PTU B.Tech 2020 March EE 3rd Sem Electronic Devices And Circuits Question Paper

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Roll No. [ ] Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EE) (2012 Onwards)/(Electrical & Electronics Engg.) (2011 Onwards)
B.Tech. (Electronics & Electrical Engg.) (2012 to 2017) (Sem.-3)
ELECTRONIC DEVICES AND CIRCUITS

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

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2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Answer briefly :
   1. What do you mean by diffusion current? Explain.
   2. Compare intrinsic and extrinsic semiconductors.

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   3. Why biasing is required? Explain.
   4. Define Icgo and Icro. How they are different?
   5. What are h-parameters? Discuss their importance.
   6. What do you mean by unregulated power supply? Discuss.
   7. Discuss the importance of op-amps in engineering.

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   8. What do you mean by CMRR? Explain.
   9. Compare active and passive filters.
   10. What do you mean by line regulation? Explain.

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SECTION-B

1. Draw and explain the basic principle, construction and characteristics of Schottky diodes.
2. Describe the basic structure and operation of a JFET. Also draw and explain the V-I characteristics of JFET. How is it different from BJT?

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3. Draw the diagram and explain the working of operational amplifier as comparator and Schmitt trigger.
4. Draw the circuit diagram and explain the working of a Wien bridge oscillator. Also compare its operation with that of Hartley oscillator.
5. Discuss in detail the working of Zener diode voltage regulators.

SECTION-C

1. a) Discuss any one of the transistor configuration. Also draw and explain its input and output characteristics.
   

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   b) Why clippers and clampers are required? Draw the diagram and discuss the working of clamping circuits.
2. Explain (in detail) :
   1. SMPS
   2. Current to voltage converter using op-amps
3. Explain the Timer 555 and its applications as mono-stable and bi-stable multi-vibrators.

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.