Physics Electronics ETEA 2022
PMDC Verified Question 464 of 494
The resistance of full wave rectifier is:
A
Less than the resistance of half wave rectifier
B
Equal to the resistance of half wave rectifier
C
More than the resistance of half wave rectifier
D
Negligible in comparison to the resistance of half wave rectifier
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: More than the resistance of half wave rectifier
Concept:

The total internal forward resistance of a rectifier circuit depends on the number of diodes in the conduction path during any given half-cycle.

Solution:

  • In a Half-Wave Rectifier, current flows through only \( 1 \) diode during the active half-cycle. Therefore, the forward resistance is \( R_d \).


  • In a Full-Wave Bridge Rectifier (the most common un-tapped configuration), current must pass through \( 2 \) diodes in series during every half-cycle. Therefore, the forward resistance is \( 2 R_d \).


  • Since \( 2 R_d > R_d \), the internal resistance of the FWR circuit is more than the resistance of a half wave rectifier.


Why other options are incorrect:

  • A single diode will physically offer less resistance than two diodes in series, making "less than" or "equal to" incorrect when comparing bridge to half-wave architectures.

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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