Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 114 of 494
If an AC mains supply has a frequency of \( 50\text{ Hz} \), what is the fundamental ripple frequency of the output voltage from a full-wave bridge rectifier?
A
25 Hz
B
50 Hz
C
100 Hz
D
200 Hz
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 100 Hz
Concept:

A full-wave rectifier inverts every negative half-cycle into a positive pulse, producing two output pulses for every input cycle.

Formula:

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

Solution:

  • Given \( f_{\text{in}} = 50\text{ Hz} \):


  • \( f_{\text{ripple}} = 2 \times 50\text{ Hz} = 100\text{ Hz} \).


Why other options are incorrect:

  • Option A: 25 Hz would imply frequency division, which does not occur in full-wave rectification.
  • Option B: 50 Hz is the ripple frequency of a half-wave rectifier, which produces one pulse per cycle.
  • Option D: 200 Hz corresponds to a 4-phase polyphase rectifier or a 100 Hz input supply.

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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