Physics Electromagnetic Induction PMC 2021
PMDC Verified Question 61 of 69

Alternating current (AC) generators utilize which of the following contact rings to connect the rotating armature coil to the external circuit?
A
Split rings
B
Solenoid rings
C
Slip rings
D
Coiled rings
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Slip rings
Concept:

This question covers the mechanical interface for drawing electrical current from a rotating shaft in a generator.

Solution:

An AC generator uses continuous copper slip rings. These rings rotate with the armature coil and maintain constant sliding contact with stationary carbon brushes, allowing the naturally alternating current induced in the coil to flow into the external load as AC.

Why other options are incorrect:

  • Split rings (or commutators) are used in DC generators and DC motors to mechanically reverse the connection polarities every half-turn, converting the internal AC into an external DC.

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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