Physics Electronics PMDC 2021
PMDC Verified Question 470 of 494
Which has less ripple factor?
A
Half wave rectifier
B
None
C
Full wave rectifier
D
Both
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Full wave rectifier
Concept:

The ripple factor (\( \gamma \)) measures the smoothness of the DC output. A lower ripple factor means a smoother DC output with fewer AC fluctuations.

Solution:

  • For a Half-Wave Rectifier (HWR), the standard ripple factor is approximately \( 1.21 \) (or \( 121\% \)), meaning the AC ripple is actually larger than the DC component.


  • For a Full-Wave Rectifier (FWR), the standard ripple factor is approximately \( 0.48 \) (or \( 48\% \)).


  • Since \( 0.48 < 1.21 \), the Full wave rectifier has significantly less ripple factor.


Why other options are incorrect:

  • Half-wave rectifiers have huge gaps between pulses, leading to massive ripples.


  • They cannot be "Both" or "None" as their mathematical constants for ripple factor distinctly differ.

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