Electrical Engineering MCQs

Page No. 168

The relative permeability of materials is not constant


adiamagnetic


bparamagnetic


c ferromagnetic


dinsulating


View Answer ferromagnetic

A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?


aM


bM/2


c 2 M


dM/4


View Answer M/2

Magnetic moment is a_____________?


a pole strength


buniversal constant


cscalar quantity


dvector quantity


View Answer vector quantity

Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials


acircular


btriangular


crectangular


dnone of the above


View Answer rectangular

A keeper is used to_____________?


achange the direction of magnetic lines


bamplify flux


crestore lost flux


dprovide a closed path for flux



The uniform magnetic field is______________?


athe field of a set of parallel conductors


bthe field of a single conductor


c the field in which all lines of magnetic flux are parallel and equidistant


dnone of the above



The change of cross-sectional area of conductor in magnetic field will affect______________?


areluctance of conductor


bresistance of conductor


cA. and B. both in the same way


d none of the above



The magneto-motive force is______________?


athe voltage across the two ends of exciting coil


bthe flow of an electric current


c the sum of all currents embraced by one line of magnetic field


d the passage of magnetic field through an exciting coil



A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?


aDecreases


b Increases


c Remains same


dFirst increases and then decreases depending on the depth of iron in¬sertion


View Answer Increases

What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?


a2 AT


b4 AT


c6 AT


d 10 AT


View Answer 4 AT

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