Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 196 of 494
If an AC source with a frequency of \( 60\text{ Hz} \) is connected to the input of a full-wave bridge rectifier, what is the fundamental ripple frequency of the output voltage across the load?
A
30 Hz
B
60 Hz
C
90 Hz
D
120 Hz
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 120 Hz
Concept:

A full-wave rectifier converts every half-cycle of the input AC sine wave into a positive output pulse, producing two output pulses per input cycle and doubling the ripple frequency.

Formula:

$$f_{\text{ripple, full-wave}} = 2 \times f_{\text{in}}$$

Solution:

  • Given: \( f_{\text{in}} = 60\text{ Hz} \).


  • Output ripple frequency: \( f_{\text{ripple}} = 2 \times 60\text{ Hz} = 120\text{ Hz} \).


Why other options are incorrect:

  • Option A: 30 Hz would imply sub-harmonic division.
  • Option B: 60 Hz is the ripple frequency of a half-wave rectifier.
  • Option C: 90 Hz is an incorrect harmonic combination.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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