Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 171 of 494
An AC line voltage with frequency \( f = 50\text{ Hz} \) supplies a bridge full-wave rectifier with a capacitor filter. What is the fundamental frequency of the output ripple?
A
25 Hz
B
50 Hz
C
200 Hz
D
100 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: 100 Hz
Concept:

A full-wave rectifier charges the filter capacitor twice per AC input cycle, producing a ripple frequency equal to double the input mains frequency.

Formula:

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

Solution:

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


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


Why other options are incorrect:

  • Option A: 25 Hz would imply sub-harmonic division.
  • Option B: 50 Hz is the ripple frequency for a half-wave rectifier.
  • Option C: 200 Hz corresponds to a 100 Hz input or a polyphase circuit.

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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