Special Purpose p-n Junction Diodes
Special Purpose p-n Junction Diodes: Overview
This topic covers concepts, such as Zener Diode, Avalanche Diode, V-I Characteristics of a Zener Diode, Field Ionisation, Zener Diode as Voltage Stabiliser, Optoelectronic Junction Devices, Photo Diode, Working of Photodiode, etc.
Important Questions on Special Purpose p-n Junction Diodes
Which of the following is/are correct
(i) The symbol for zener diode is
(ii) The reverse I – V characteristics of a zener diode.

The following characteristics. Curve is of a:

In Zener diode, for currents greater than the knee current, the V-I curve is almost straight line_____ to x-axis.

Explain V-I characteristics of zener diode?

What is the principle of working of solar cell.

What is field ionisation?

What is the optoelectronic junction devices

Solar cells are made of

Photo diode used in reverse bias condition.

LED is a forward bias p-n junction diode.

In a photodiode,

A Zener diode, having breakdown voltage equal to , is used in a circuit shown in the figure. If the applied voltage is , the current through the Zener diode is . The value of is

What is the order of the reverse saturation current before breakdown in a zener diode?

Solar cell is a photodiode operated at

Identify characteristics are given below, in the order (i), (ii), (iii), (iv):
i. ii.
iii. iv.

List some uses of solar cell.

Briefly explain the working of a solar cell.

What is Light emitting diode?

Which of the characteristic curve are correct.
Photodiode for
Solar cell
L.E.D.

Mention some advantages of LEDs over an incandescent lamp.
