Electrical Engineering MCQs

Page No. 164

Indicate which of the following material does not retain magnetism permanently


a Soft iron


bStainless steel


c Hardened steel


dNone of the above


View Answer Soft iron

The force between two long parallel conductors is inversely proportional to_____________?


aradius of conductors


bcurrent in one conductor


cproduct of current in two conductors


ddistance between the conductors



The left hand rule correlates to______________?


acurrent, induced e.m.f. and direction of force on a conductor


bmagnetic field, electric field and direction of force on a conductor


c self induction, mutual induction and direction of force on a conductor


d current, magnetic field and direction of force on a conductor



A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be______________?


azero


bBLI


cB2LI


d BLI2


View Answer zero

The use of permanent magnets is. not made in_____________?


amagnetoes


benergy meters


ctransformers


dloud-speakers


View Answer transformers

Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________?


a2 x 1(T2 N/m)


b2 x KT3 N/m


c2 x 10″5 N/m


d 2x 1(T7 N/m)


View Answer 2x 1(T7 N/m)

The main constituent of permalloy is_____________?


acobalt


bchromium


c nickel


dtungsten


View Answer nickel

Paramagnetic materials have relative permeability________________?


aslightly less than unity


b equal to unity


c slightly more than unity


dequal to that ferromagnetic mate rials



Gilbert is a unit of_______________?


aelectromotive force


bmagnetomotive force


cconductance


dpermittivity


View Answer magnetomotive force

Substances which have permeability less than the permeability of free space are known as_____________?


aferromagnetic


bparamagnetic


c diamagnetic


d bipolar


View Answer diamagnetic

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