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# EC6202 Electronic Devices and Circuits Important questions

EC6202 Electronic Devices and Circuits Important questions Regulation 2013 Anna University free download. Electronic Devices and Circuits EC6202 Important questions pdf free download.

## Sample EC6202 Electronic Devices and Circuits Important questions:

Part A

1. Define Knee Voltage of a diode

The minimum voltage at which the diode starts conducting and current starts increasing Exponentially is called knee voltage of a diode.

2. What is peak inverse voltage

In reverse biased, opposite polarity voltage appears across diode. The maximum voltage which diode can withstand without breakdown is called peak inverse voltage. (EC6202 Electronic Devices and Circuits Important questions)

3. Differentiate drift and diffusion current

When a voltage is applied to a material, the free electrons move towards the positive of the battery. While moving them collide with the adjacent atoms and keep changing their directions randomly. In case of diffusion current, the external voltage is not required.

4. What is a PN Junction diode

There are two electrodes each from p-type and n-type materials and due to these two electrodes; the device is called a diode. It conducts only in one direction.

### PART-B (EC6202 Electronic Devices and Circuits Important questions)

1. With a neat diagram explain the working of a PN junction diode in forward bias and reverse bias and show the effect of temperature on its V-I characteristics. (16)

2. Explain V-I characteristics of Zener diode. (8)

3. Draw the circuit diagram and explain the working of full wave bridge rectifier and derive the expression for average output current and rectification efficiency. (8)

4. Explain the operation of FWR with centre tap transformer. Also derive the following for this transformer.dc output voltage (4) dc output current (2) (iv) RMS output voltage. (4) (EC6202 Electronic Devices and Circuits Important questions)

5. Explain the following regulator circuits : (i) Transistorized shunt regulator. (8) (ii) Zener diode shunt regulator. (8)

6. Draw the circuit diagram and explain the operation of full wave rectifier using center tap transformer and using bridge rectifier without center tap transformer. Obtain the expression for peak inverse voltage. (16)

 Subject Name Electronic Devices and Circuits Subject code EC6202 Regulation 2013