Physics Electromagnetic Induction SZABMU 2022
PMDC Verified Question 44 of 69
The efficiency of transformer is:
A
60%
B
70%
C
80%
D
90%
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 90%
Concept:

Transformers are highly efficient solid-state devices with no moving parts.

Solution:

  • Because there is no mechanical friction or air resistance, real-world transformers only suffer from minor copper (resistive) and iron (eddy current/hysteresis) losses.


  • Well-designed commercial transformers typically achieve an efficiency of 90% to 99%.


Why other options are incorrect:

Efficiencies of 60%, 70%, or 80% are characteristic of machines with heavy mechanical moving parts (like combustion engines or older motors), not modern transformers.

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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