Free Electromagnetic Induction MCQs with Answers
288 Electromagnetic Induction MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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Read the Electromagnetic Induction notesFree MDCAT chapter notes with key terms288 questions · page 8 of 15
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Explanation for this question will be added soon!
Correct answer: Option B- A. Maximum and no current pass through the coil
- B. Minimum and a large current pass through the coil
- C. Zero and large current passes through the coil
- D. All of above
Explanation: Explanation for this question will be added soon!
Correct answer: Zero and large current passes through the coil- A. Halt-wave rectified voltage
- B. A.C
- C. D.C
- D. Fluctuating D.C
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Correct answer: Fluctuating D.C144. An electric motor:
- A. Generates mechanical energy
- B. Generates electric energy
- C. Converts mechanical energy into electric energy
- D. Converts electrical energy into mechanical energy
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Correct answer: Converts electrical energy into mechanical energy- A. Charge
- B. emf
- C. Energy
- D. Magnetism
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Correct answer: Energy- A. Converter
- B. Thermo couple
- C. d.c dynamo
- D. d.c galvanometer
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Correct answer: d.c dynamo147. A transformer:
- A. Works on A.C. only
- B. Works on both A.C and D.C
- C. Works on D.C only
- D. Has no hysteresis loss
Explanation: A transformer is an electrical device used to change a given alternating emf into a lame or small alternating emf. It works only on A.C.
Correct answer: Works on A.C. only- A. Less than the number of turns in the primary
- B. Greater than the number of turns in the primary
- C. Equal the number of turns in the primary
- D. Infinite
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Correct answer: Greater than the number of turns in the primary- A. Decreases
- B. Increases
- C. Remain unchanged
- D. None of the above
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Correct answer: Decreases- A. Hystresis loss
- B. Copper loss
- C. Both (a) and (b)
- D. Mechanical loss
Explanation: Explanation for this question will be added soon!
Correct answer: Mechanical loss151. A transformer has:
- A. Two coil
- B. Only one coil
- C. Works on the principle of mutual induction
- D. None of these
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Correct answer: Works on the principle of mutual induction- A. Primary coil
- B. Secondary coil
- C. Field coil
- D. None of these
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Correct answer: Secondary coil- A. Magnetically linked
- B. Electrically linked
- C. Both (a) and (b)
- D. None of these
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Correct answer: Magnetically linked- A. Option A
- B. Option B
- C. Option C
- D. Option D
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Correct answer: Option D- A. Equal to that of primary
- B. Equal to that of secondary
- C. Greater than that of primary
- D. Smaller than that of primary
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Correct answer: Equal to that of secondary- A. Calculated by I2R
- B. Zero
- C. Maximum
- D. All of above
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Correct answer: Calculated by I2R- A. Resistance is reduced
- B. Current is increased
- C. Potential difference is increased
- D. Current is reduced
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Correct answer: Current is reduced- A. Equal to input
- B. Less than input
- C. Greater than input
- D. None of these
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Correct answer: Less than input- A. Hysteresis
- B. Eddy current
- C. Both (a) and (b)
- D. None of these
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Correct answer: Both (a) and (b)- A. In a direction perpendicular to the flux
- B. Along the flux lines
- C. Out of flux area
- D. None of these
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Correct answer: In a direction perpendicular to the flux