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Turn your Class 12 AC generator notes into MCQs with explanations

Upload your chapter on alternating current and get multiple-choice questions on the AC generator, with an explanation for every option. Start free with no credit card.

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How to practice AC generator MCQs for Class 12

Class 12 physics students often need MCQs on AC generator practice once the electromagnetic induction chapter is done, because exam questions test the emf formula, the role of slip rings, and how the output changes with speed. Ready-made sets may not match your syllabus or your teacher's wording, so a set built from your own notes is usually more useful.

Principle of electromagnetic induction and Lenz's law
Instantaneous emf e = NBAω sin ωt and peak emf E0 = NBAω
Slip rings in an AC generator versus the commutator in a DC dynamo
Relation between angular speed, frequency, and the period of the output

Example Class 12 AC generator MCQs

What is the principle of an AC generator?Electromagnetic induction: a coil rotating in a magnetic field produces an emf that changes direction periodically, because the flux linkage keeps changing.

What is the instantaneous emf of an AC generator with N turns, area A, field B, and angular speed ω?e = NBAω sin ωt. The sine term comes from the angle between the coil's normal and the field, which changes with time.

Why do AC generators use slip rings instead of a commutator?Slip rings keep the output alternating, while a commutator reverses the connection each half turn to give one-directional current in a DC dynamo.

True or false: the emf in an AC generator is maximum when the coil plane is perpendicular to the magnetic field.False. The emf is maximum when the coil plane is parallel to the field, because the rate of change of flux is then greatest.

What happens to the peak emf if the coil's angular speed is doubled?It doubles. Peak emf equals NBAω, so it is directly proportional to the angular speed ω.

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Multiple-choice, true/false, and short answer

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Answer the questions, read the explanations, and revisit the ones you missed. Spaced repetition is available on Plus.

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Frequently asked questions

How does an AC generator produce alternating current?

A coil rotates in a magnetic field, so the magnetic flux through it changes continuously. By Faraday's law, this induces an emf that reverses direction every half turn.

Which formulas should I memorize for AC generator MCQs?

Memorize e = NBAω sin ωt and the peak value E0 = NBAω, since many questions test them directly. Also know that ω = 2πf, which links angular speed to frequency.

Can I generate MCQs from my own textbook pages?

Yes. Upload a PDF, slides, or notes, or photograph the pages, and DeckOwl writes multiple-choice, true/false, and short answer questions with explanations. The free plan includes 3 generations per month.

Do I need to pay to export the questions?

Yes, exports are a paid feature. Plus includes PDF, DOCX, and Anki export at $99.90/year or $9.99/month, and Pro adds QTI 2.1 and Moodle XML. Students get 40% off with a school email.

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