Electrical Engineering MCQs

Page No. 180

If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?


aaid the increasing current


btend to decrease the amount of cur-rent


cproduce current opposite to the in-creasing current


d aid the applied voltage



Air-core coils are practically free from______________?


ahysteresis losses


beddy current losses


cboth (A) and (B)


dnone of the above


View Answer both (A) and (B)

The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as__________?


a self-inductance


b mutual inductance


c series aiding inductance


dcapacitance


View Answer self-inductance

The direction of induced e.m.f. can be found by_____________?


aLaplace’s law


bLenz’s law


cFleming’s right hand rule


dKirchhoff s voltage law


View Answer Lenz’s law

An open coil has_____________?


a zero resistance and inductance


b infinite resistance and zero inductance


cinfinite resistance and normal inductance


dzero resistance and high inductance



The inductance of a coil will increase under all the following conditions except______________?


awhen more length for the same number of turns is provided


bwhen the number of turns of the coil increase


c when more area for each turn is provided


dwhen permeability of the core increases



As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?


a lies perpendicular to the magnetic flux


b lies in a magnetic field


c cuts magnetic flux


dmoves parallel to the direction of the magnetic field


View Answer cuts magnetic flux

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?


a increase


b decrease


c remain the same


dinitially increase and then decrease


View Answer decrease

Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?


a unaffected


bdoubled


c halved


d quadrupled


View Answer doubled

Higher the self-inductance of a coil_____________?


alesser its weber-turns


blower the e.m.f. induced


cgreater the flux produced by it


dlonger the delay in establishing steady current through it



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