Download OU B.Sc 2019 Dec 3rd Sem (2nd Year) 8081 Electronics Question Paper

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SUBJECT : ELECTRONICS

(DSC) Paper - III

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(Analog Circuits)

Max Marks : 80

PART - A (5x4 = 20 Marks)

(Short Answer Type)

Note : Answer all the following FIVE questions. Each question carries 4 marks.

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1. Explain about choke input filter.
2. A full wave rectifier uses two diodes with load resistance. Each diode is having negligible forward resistance. Find efficiency of this full wave rectifier.
3. Explain working of switch mode power supply (SMPS).
4. Explain about three terminal 78XX IC regulator.
5. Explain the mechanism of current flow in a NPN transistor.

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6. Calculate the gain of a negative feedback amplifier with an internal gain of A = 100 and feedback factor =1/1000.
7. Write a note on RC Phase Shift Oscillator.
8. What is Astable multivibrator?

PART - B (4x15 = 60 Marks)

(Essay Answer Type)

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Answer the following questions. Each question carries 15 marks.

1. Explain the working of a Half-wave rectifier with a neat diagram and compare with full wave rectifier.

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