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

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btend to decrease the amount of cur-rent

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cproduce current opposite to the in-creasing current

✓


d aid the applied voltage

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Air-core coils are practically free from______________?


ahysteresis losses

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beddy current losses

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cboth (A) and (B)

✓


dnone of the above

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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

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c series aiding inductance

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dcapacitance

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View Answer self-inductance

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


aLaplace’s law

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bLenz’s law

✓


cFleming’s right hand rule

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dKirchhoff s voltage law

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View Answer Lenz’s law

An open coil has_____________?


a zero resistance and inductance

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b infinite resistance and zero inductance

✓


cinfinite resistance and normal inductance

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dzero resistance and high inductance

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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

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c when more area for each turn is provided

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dwhen permeability of the core increases

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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

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b lies in a magnetic field

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c cuts magnetic flux

✓


dmoves parallel to the direction of the magnetic field

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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

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b decrease

✓


c remain the same

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dinitially increase and then decrease

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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

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bdoubled

✓


c halved

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d quadrupled

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View Answer doubled

Higher the self-inductance of a coil_____________?


alesser its weber-turns

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blower the e.m.f. induced

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cgreater the flux produced by it

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dlonger the delay in establishing steady current through it

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