Which of the following expresses the relationship of the AC input frequency and DC ripple output frequency in a full wave rectifier?

Correct Answer: Option D — The output ripple frequency is twice the input frequency.

In a full-wave rectifier, both the positive and negative half-cycles of the AC input are utilized. Because the negative half-cycle is inverted to become a second positive pulse, the output ripple frequency is exactly twice the input frequency, resulting in a more efficient conversion to DC.