Name the semiconductor device that can be used to regulate an unregulated d.c. power supply. With the help of I-V characteristics of this device, explain its working principle.

In figure shows the V-I characteristics of semiconductor diode. Draw the circuit diagram to obtain the given characteristic of this device.

Figure VSAQ 61 shows the I-V characterstic of a given device. Name the device and write where it is used?

Name the optoelectronic device used for detecting optical signals and mention the biasing in which it is operated. Draw its I-V characterstics?

Explain the principle of a device that can build up high voltages of the order of a few million volts.Draw a schematic diagram and explain the working of this device. Is there any restriction on the upper limit of the high voltages set up in this machine? Explain.

Draw a labelled diagram of a d.c. motor. State its principle and explain its working.

Which special type of diode can act as a voltage regulator? Give the symbol of this diode and draw the general shape of its V-I characteristics.

Name the devic,e which is used as a voltage regulator. Draw the necessary circuit diagram and explain its working.

An electric device which runs at 80 volt d.c. and consumes 10 A is connected to 100 V, 50 Hz a.c. supply through a choke. Calculate the inductance of the choke for safe working of the device.

What is photo diode? Briefly explain its working and draw its V-I characteristics?