Previous year question paper for EDC (Diploma Electronics & Communication Engineering 3rd)

1. Wave Shaping Circuits (08 hrs)

1.1 General idea about different wave shapes

1.2 RC and RL integrating and differentiating circuits with their applications

1.3 Diode clipping and clamping circuits and simple numerical problems on

these circuits

2. Multivibrator Circuits (14 hrs)

2.1 Working principle of transistor as switch

2.2 Concept of multi-vibrator:- astable, monostable, and bistable and their

applications

2.3 Block diagram of IC555 and its working and applications

2.4 IC555 as monostable and astable multi-vibrator

3. Operational Amplifiers (18hrs)

3.1 Characteristics of an ideal operational amplifier and its block diagram

and Pin Identification

3.2 Definition of differential voltage gain, CMRR, PSRR, slew rate and input

offset current, input offset voltage, Input Bias current, total output offset

voltage, Thermal drift.

3.3 Open loop configurations: Differential, Inverting & Non Inverting.

3.4 Operational amplifier as an inverter, scale changer, adder, subtractor,

differentiator, and integrator

3.5 Concept of Schmitt trigger circuit, Zero crossing detector, Peak

Detector,and sample/hold circuit using operational amplifier and their

application

3.6 Op-Amp as saw-tooth wave generator.

3.7 Op-Amps with negative feedback:- Block diagram representation of

feedback configurations, Voltage-series feedback Amplifier, Voltage

shunt feedback amplifier, current series, current shunt. 

4. Regulated DC Power Supplies (10 hrs)

4.1 Concept of DC power supply. Line and load regulation

4.2 Concept of fixed voltage, IC regulators (like 7805, 7905), and variable

voltage regulator like (IC 723)

4.3 Concept of SMPS

5. Opto-Electronic Devices (08 hrs)

Working principle, characteristics and applications of photo resistors, photo

diodes, photo transistors and opto-couplers.

6. IC Based oscillators & PLL. (06 hrs)

VCO (IC 565) and Phase Locked Control (IC 566) and their Applications