Magnetic Circuit Objective Questions and Answers


1.  An air gap is usually inserted in a magnetic circuits to


   A. Increase m.m.f.

   B. Increase the flux

   C. Prevent saturation

   D. None of the above


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C. Prevent saturation

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2.  Permeability in a magnetic circuit corresponds to ................in an electric circuit


   A. Resistance

   B. Resistivity

   C. Conductivity

   D. Conductance


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C. Conductivity

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3.  Those magnetic materials are best suited for making armature and transform cores which have ...........permeability and ...........hysteresis loss


   A.High, high

   B. Low, high

   C. High, low

   D. Low, low


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C. High, low

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4.  In a magnetic material hysteresis loss takes place primarily due to


   A. Rapid reversals of its magnetisation

   B. Flux density lagging behind the magnetising force

   C. Molecular friction

   D. It high retentivity


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D. It high retentivity

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5.  The property of a material which opposes the creation of magnetic flux in it is known as


   A. Reluctivity

   B. Magnetomotive force

   C. Permeance

   D. Reluctance


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D. Reluctance

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