Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 144 of 494
Which device converts direct current (DC) into alternating current (AC)?
A
Rectifier
B
Inverter
C
Step-down transformer
D
Filter capacitor
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Inverter
Concept:

An inverter uses electronic switching circuits (such as MOSFETs or IGBTs) to convert steady direct current (DC) into alternating current (AC).

Formula:

$$\text{Inverter: } \text{DC Input} \longrightarrow \text{AC Output}$$

$$\text{Rectifier: } \text{AC Input} \longrightarrow \text{DC Output}$$

Solution:

  • An inverter converts DC from sources like batteries or solar panels into standard AC power.


  • A rectifier performs the opposite function, converting AC into DC.


Why other options are incorrect:

  • Option A: A rectifier converts AC into DC.
  • Option C: A transformer changes the voltage level of an AC signal; it cannot operate on steady DC.
  • Option D: A filter capacitor smooths voltage ripple in DC circuits.

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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