Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 336 of 494
What is the primary operational function of an ideal semiconductor \( \text{P-N} \) junction diode?
A
To permit electric current in one direction while blocking it in the reverse direction
B
To amplify weak alternating current signals into high-power direct current signals
C
To maintain a constant electrical capacitance across varying operational frequencies
D
To store electrostatic energy indefinitely within an expanding depletion boundary
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: To permit electric current in one direction while blocking it in the reverse direction
Concept:

A \( \text{P-N} \) junction diode is a non-linear, two-terminal semiconductor device that acts as a unidirectional current valve.

Formula:

Qualitative concept / No formula required.

Solution:

  • Under forward bias, the diode presents negligible dynamic resistance, allowing large current flow.


  • Under reverse bias, the widened depletion layer provides extremely high resistance, blocking current except for a negligible minority leakage current.


Why other options are incorrect:

  • Option B: Signal amplification requires a three-terminal active device such as a bipolar junction transistor (BJT) or operational amplifier.
  • Option C: The junction capacitance changes dynamically with applied reverse voltage rather than remaining constant.
  • Option D: Energy storage is the function of capacitors and inductors, not the primary rectifying function of a diode.

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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