Electrical Engineering MCQs

Page No. 168

The relative permeability of materials is not constant


adiamagnetic

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bparamagnetic

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c ferromagnetic

✓


dinsulating

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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

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cscalar quantity

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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

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bamplify flux

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crestore lost flux

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dprovide a closed path for flux

✓



The uniform magnetic field is______________?


athe field of a set of parallel conductors

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bthe field of a single conductor

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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

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bthe flow of an electric current

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

✓


d the passage of magnetic field through an exciting coil

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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

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b Increases

✓


c Remains same

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

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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

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b4 AT

✓


c6 AT

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d 10 AT

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View Answer 4 AT

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