Inductor and Inductance Multiple Choice Questions and Answers


1.  Which of the following inductor will have the least eddy current losses?


   A. Air core

   B. Laminated iron core

   C. Iron core

   D. Powdered iron core


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A. Air core

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2.  A crack in the magnetic path of an inductor will result in


   A. Unchanged inductance

   B. Increased inductance

   C. Zero inductance

   D. Reduced inductance


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D. Reduced inductance

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3.  A laminated iron core has reduced Eddy current losses because


   A. More wire can be used with less DC resistance in coil

   B. The laminations are insulated from each other

   C. The magnetic flux is concentrated in the air gap of the core

   D. The laminations are stacked vertically


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B. The laminations are insulated from each other

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4.  A coil is wound on iron core which carries current . The self induced voltage in the coil is not affected by


   A. Variation in coil current

   B. Variation in voltage to the coil

   C. Change of number of terms of coil

   D. The resistance of magnetic path


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B. Variation in voltage to the coil

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5.  The coefficient of coupling between two air core coils depends on


   A. Self inductance of two coils only

   B. Mutual inductance between two coils only

   C. Mutual inductance and a self inductance of two coils

   D. None of the above


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C. Mutual inductance and self inductance of two coils

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