Electromagnetic Induction MCQs Part 4

Electrical Engineering Multiple Choice – Electromagnetic Induction MCQs Part 4

A crack in the magnetic path of an inductor will likely cause

A crack in the magnetic path of an inductor will likely cause

  1. Increased inductance
  2. Reduced inductance
  3. Unchanged inductance
  4. Zero inductance

Correct answer: 2. Reduced inductance

The resistance and inductance of an open coil are

The resistance and inductance of an open coil are

  1. Infinite resistance and normal inductance respectively
  2. Infinite resistance and zero inductance respectively
  3. Zero resistance and high inductance respectively
  4. Zero resistance and inductance respectively

Correct answer: 2. Infinite resistance and zero inductance respectively

If all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

If all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

  1. 0
  2. 0.5
  3. 1
  4. 2

Correct answer: 3. 1

Laminated iron core has reduced eddy-current losses since

Laminated iron core has reduced eddy-current losses since

  1. More wire can be used with less DC resistance in coil
  2. The laminations are insulated from each other
  3. The laminations are stacked vertically
  4. The magnetic flux is concentrated in the air gap of the core

Correct answer: 2. The laminations are insulated from each other

Lenz’s law is a consequence of the law of conservation of

Lenz’s law is a consequence of the law of conservation of

  1. Charge
  2. Energy
  3. Induced current
  4. Induced EMF

Correct answer: 2. Energy

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