Physics Electromagnetic Induction ETEA 2018
PMDC Verified Question 66 of 69
The function of main transformer is to convert:
A
One direct voltage to another direct voltage of different magnitude
B
One alternating voltage to another alternating voltage of different magnitude
C
A high value alternating voltage to low value direct voltage
D
A high value alternating current to low value direct voltage
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: One alternating voltage to another alternating voltage of different magnitude
Concept:

A transformer requires a continuously changing magnetic flux to induce an EMF in the secondary coil, which is only possible with alternating current (AC).

Solution:

  • The core function of a transformer is to step up or step down AC voltages while maintaining the same frequency. Therefore, it converts one alternating voltage to another alternating voltage of different magnitude.


Why other options are incorrect:

Transformers cannot operate on direct current (DC) because constant current produces no change in flux. They also do not convert AC to DC; that is the job of a rectifier.

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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