Question

Zener diode is used for

• A. producing oscillations in an oscillator
• B. amplification
• C. stabilisation
• D. rectification

Answer 1

The Correct Option is C

A Zener diode is a special type of semiconductor diode that is designed to reliably allow current to flow "backwards" when a certain set reverse voltage, known as the Zener voltage, is reached. This unique characteristic makes it an ideal component for voltage stabilization purposes.

Let's evaluate the options one by one:

1. Producing oscillations in an oscillator: Oscillators are circuits that produce a continuous, repeated waveform without an input signal. Zener diodes are not used in generating oscillations. Rather, they are used to maintain a constant voltage.
2. Amplification: Amplification is the process of increasing the power of a signal using devices like transistors or operational amplifiers. A Zener diode does not amplify signals; instead, it maintains a fixed output voltage.
3. Stabilisation: This is the correct option. Zener diodes are primarily used for voltage stabilization. They are employed in circuits where a stable reference voltage is required, even with variations in load current or input voltage. When the input voltage exceeds the Zener voltage, the diode conducts in reverse, maintaining a constant output voltage.
4. Rectification: Rectification involves converting alternating current (AC) to direct current (DC). While normal diodes are used in rectification processes, Zener diodes are not generally used for this purpose due to their reverse-biased operation.

In summary, the main function of the Zener diode in electrical circuits is voltage stabilisation. This property makes them very useful in power supplies and voltage regulation systems where maintaining a constant output voltage is crucial.