If a full wave rectifier circuit is operating from `50 Hz` mains, the fundamental frequency in the ripple frequency will be

Options

A. 1. 25 Hz
B. 2. 50 Hz
C. 3. 70.7 Hz
D. 4. 100 Hz

Explanation

To solve the problem, we need to determine the ripple frequency generated by a full wave rectifier when it operates from a 50 Hz mains supply.

### Step-by-step Solution:

1. **Understand the Concept of Ripple Frequency**:
A full wave rectifier converts both halves of the AC waveform into DC. This means that for each cycle of AC, the rectifier produces two pulses of DC output (one for each half of the AC cycle).

2. **Identify the AC Frequency**:
The problem states that the AC frequency is 50 Hz. This is the frequency of the mains supply.

3. **Calculate the Ripple Frequency**:
Since a full wave rectifier produces two output pulses for each cycle of the AC input, the ripple frequency (which is the frequency of the output DC ripple) is twice the frequency of the AC input.
\[ \text{Ripple Frequency} = 2 \times \text{AC Frequency} \]
Substituting the given value:
\[ \text{Ripple Frequency} = 2 \times 50 \text{ Hz} = 100 \text{ Hz} \]

4. **Conclusion**:
The ripple frequency for a full wave rectifier operating from a 50 Hz mains supply is 100 Hz.

### Final Answer:
The fundamental frequency in the ripple frequency will be **100 Hz**.

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