Electrical Engineering MCQs

Page No. 169

The initial permeability of an iron rod is________________?


a the highest permeability of the iron rod

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b the lowest permeability of the iron rod

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c the permeability at the end of the iron rod

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d the permeability almost in non-magnetised state

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Which of the following statements is correct ?


aThe magnetic flux inside an exciting coil is lower than its outside surface

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b The magnetic flux inside an exciting coil is zero

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cThe magnetic flux inside the exciting coil is greater than its outside surface

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dThe magnetic flux inside the exciting coil is same as on its outside surface

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The magnetic reluctance of a material______________?


adecreases with increasing cross sectional area of material

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bincreases with increasing cross-sec-tional area of material

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cdoes not vary with increasing cross-sectional area of material

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dany of the above

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In a simple magnetic field the strength of magnet flux_______________?


ais constant and has same value in energy part of the magnetic field

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b increases continuously from initial value to final value

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cdecreases continuously from initial value to final value

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dfirst increases and then decreases till it becomes zero

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The bar magnet has____________?


athe dipole moment

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bmonopole moment

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cA. and B. both

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d none of the above

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View Answer the dipole moment

How does the magnetic compass needle behave in a magnetic field ?


aIt assures a position right angle to magnetic field

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b It starts rotating

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c It assures a position which follows a line of magnetic flux

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dNone of the above

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Which of the following type of materials are not very important for engineering applications ?


aFerromagnetic

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b Paramagnetic

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cDiamagnetic

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dNone of the above

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View Answer Diamagnetic

The stray line of magnetic flux is defined as_____________?


aa line vertical to the flux lines

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bthe mean length of a ring shaped coil

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ca line of magnetic flux in a non-uniform field

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da line of magnetic flux which does not follow the designed path

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Which of the following materials are diamagnetic ?


aSilver

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bCopper

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c Silver and copper

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d Iron

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View Answer Silver and copper

For which of the following materials the saturation value is the highest ?


a Ferromagnetic materials

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b Paramagnetic materials

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cDiamagnetic materials

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dFerrites

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View Answer Ferrites

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