Edc Full Form – Edc అంటే ఏమిటి?

First Semester Exam Paper – 2025

PART-A

1.a) What is mean by potential barrier in the pn junction diode?
b) Define Diode Reverse Recovery time.
c) Why a simple capacitor filter in rectifiers not suitable for heavy loads?
d) What is PIV? What value it have for Full Wave Bridge Rectifier?
e) What is early effect?
f) Write a relation between α and ß.
g) Define a pinch off voltage of FET.
h) Write the drain current equation of FET.
i) What is tunneling phenomenon?
j) Write any two applictions of SCR.

PART-B

2.a) Draw the VI characteristics of a PN junction diode and derive the diode equation.
b) How diffusion capacitance is formed and what are the problems posed by this?

OR

3.a) A PN junction diode has at a temperature of 125°C , a reverse saturation current of 3oµA.
Find the dynamic resistance for 0.2V bias in forward and reverse direction?
b) How the reverse saturation current of PN junction diode depends on temperature?

4.a) Draw the circuit diagram of full wave rectifier with capacitor filter and derive the equation for its ripple factor.
b) Explain the working of two level diod clipper with neat circuit diagram.

OR

5.a) Compare the performance parameter of positive and negative clampers.
b) A 10Hz symmetrical squal wave, with a peak to peak amplitude of 2 V, is impressed upon a positive clamper circuit. Calculate and sketch the oputput waveform.
What is the peak to peak output amplitude?

6.a) Prove the current relation Ic = αIE + ßiCBO depends on temperature.
b) How a transistor is worked as switch and define all switching times.

OR

7. Draw the circuit diagram of CE configuration circuit and explain it and also draw the input and output characteristics.

8.a) Compare N-channel and P- channel FETs.
b) Explain how FET is working as a VVR?

OR

9. Explain the working of different types of MOSFETs with their input and output characteristics.

10.a) Draw the V-I characteristics of zener diods and compare it with pn diode.
b) Explain the principle of basic solar cell.

OR

11.a) Explain the working of UJT with its its neat construction and VI characteristics.
b) Draw the symbol of Schottky diode and explain its characteristics in detail.

Edc Full Form 

Electronics Devices And Circuits

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