Question

Diagram shows a circuit consisting of some elements. The input and output of the circuit is shown. Choose the correct option that shows the component in box. (Zener diode has a breakdown potential of 5V)





Options are:



 

• A. (1)
• B. (2)
• C. (3)
• D. (4)

Answer 1

The Correct Option is D

Step 1: Analyze input and output waveforms.
Input peak is $20\text{V}$. Output is clipped symmetrically at $+5\text{V}$ and $-5\text{V}$.

Step 2: Understand the function of a Zener clipper.
To clip both halves of the cycle at a specific voltage, two Zener diodes are connected back-to-back in series. When one diode is in breakdown, the other is forward biased.

Step 3: Determine required breakdown voltage.
Since clipping occurs at $5\text{V}$ and Zener breakdown is $5\text{V}$, the series combination will clip when the input exceeds $V_Z + V_{forward} \approx 5\text{V} + 0\text{V} = 5\text{V}$.

Step 4: Identify the correct configuration.
Option (4) shows two Zener diodes connected in series facing each other (anodes connected together or cathodes connected together). This configuration provides symmetrical clipping.

Final Answer: Option (4).