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MCQs 1: A laminated iron core has reduced eddy-current losses because____________?

more wire can be used with less D.C. resistance in coil the laminations are insulated from each other the magnetic flux is concentrated in the air gap of the core the laminations are stacked vertfcally
Answer Explanation

MCQs 2: The magnitude of the induced e.m.f. in a conductor depends on the______________?

flux density of the magnetic field amount of flux cut amount of flux linkages rate of change of flux-linkages
Answer Explanation

MCQs 3: Which of the following is not a unit of inductance ?

Henry Coulomb/volt ampere Volt second per ampere All of the above
Answer Explanation

MCQs 4: Mutually inductance between two magnetically-coupled coils depends on____________?

permeability of the core the number of their turns cross-sectional area of their common core all of the above
Answer Explanation

MCQs 5: The law that the induced e.m.f. and current always oppose the cause producing them is due to____________?

Faraday Lenz Newton Coulomb
Answer Explanation

MCQs 6: If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?

aid the increasing current tend to decrease the amount of cur-rent produce current opposite to the in-creasing current aid the applied voltage
Answer Explanation

MCQs 7: Air-core coils are practically free from______________?

hysteresis losses eddy current losses both (A) and (B) none of the above
Answer Explanation

MCQs 8: 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__________?

self-inductance mutual inductance series aiding inductance capacitance
Answer Explanation

MCQs 9: The direction of induced e.m.f. can be found by_____________?

Laplace’s law Lenz’s law Fleming’s right hand rule Kirchhoff s voltage law
Answer Explanation

MCQs 10: An open coil has_____________?

zero resistance and inductance infinite resistance and zero inductance infinite resistance and normal inductance zero resistance and high inductance
Answer Explanation

MCQs 11: The inductance of a coil will increase under all the following conditions except______________?

when more length for the same number of turns is provided when the number of turns of the coil increase when more area for each turn is provided when permeability of the core increases
Answer Explanation

MCQs 12: As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?

lies perpendicular to the magnetic flux lies in a magnetic field cuts magnetic flux moves parallel to the direction of the magnetic field
Answer Explanation

MCQs 13: 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_____________?

increase decrease remain the same initially increase and then decrease
Answer Explanation

MCQs 14: Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?

unaffected doubled halved quadrupled
Answer Explanation

MCQs 15: Higher the self-inductance of a coil_____________?

lesser its weber-turns lower the e.m.f. induced greater the flux produced by it longer the delay in establishing steady current through it
Answer Explanation

MCQs 16: Which of the following circuit element stores energy in the electromagnetic field ?

Inductance Condenser Variable resistor Resistance
Answer Explanation

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