Electrical Engineering MCQs

Page No. 169

The initial permeability of an iron rod is________________?


a the highest permeability of the iron rod


b the lowest permeability of the iron rod


c the permeability at the end of the iron rod


d the permeability almost in non-magnetised state



Which of the following statements is correct ?


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


b The magnetic flux inside an exciting coil is zero


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


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



The magnetic reluctance of a material______________?


adecreases with increasing cross sectional area of material


bincreases with increasing cross-sec-tional area of material


cdoes not vary with increasing cross-sectional area of material


dany of the above



In a simple magnetic field the strength of magnet flux_______________?


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


b increases continuously from initial value to final value


cdecreases continuously from initial value to final value


dfirst increases and then decreases till it becomes zero



The bar magnet has____________?


athe dipole moment


bmonopole moment


cA. and B. both


d none of the above


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


b It starts rotating


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


dNone of the above



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


aFerromagnetic


b Paramagnetic


cDiamagnetic


dNone of the above


View Answer Diamagnetic

The stray line of magnetic flux is defined as_____________?


aa line vertical to the flux lines


bthe mean length of a ring shaped coil


ca line of magnetic flux in a non-uniform field


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



Which of the following materials are diamagnetic ?


aSilver


bCopper


c Silver and copper


d Iron


View Answer Silver and copper

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


a Ferromagnetic materials


b Paramagnetic materials


cDiamagnetic materials


dFerrites


View Answer Ferrites

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