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.

Write briefly, how a Zener diode acts as voltage regulator.

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

Name the diode for which the output voltage is a regulated voltage.

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

Assume that the silicon diode in the circui shown in fig. requires a minimum current of 1mA to be above the knee point (0.7V) of its I-V characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point. If R=1kOmega , what is the minimum voltage V_(B) required to keep the diode above the knee point?

Assume that the silicon diode in the circui shown in fig. requires a minimum current of 1mA to be above the knee point (0.7V) of its I-V characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point. What is the power dissipated in the resistance R and in the diode, when a current of 5mA flows in the circuit at V_(B)=6V ?

Assume that the silicon diode in the circui shown in fig. requires a minimum current of 1mA to be above the knee point (0.7V) of its I-V characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point. If V_(B)=5 V, what should be the maximum value of R so that the voltage is above the knee point?