Electrical Engineering MCQs

Page No. 177

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?


avariation in coil current


bvariation in voltage to the coil


cchange of number of turns of coil


dthe resistance of magnetic path



A crack in the magnetic path of an inductor will result in________________?


aunchanged inductance


bincreased inductance


czero inductance


dreduced inductance


View Answer reduced inductance

The co-efficient of coupling between two air core coils depends on____________?


aself-inductance of two coils only


b mutual inductance between two coils only


cmutual inductance and self inductance of two coils


dnone of the above



Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?


a5 mH


b10 mH


c5 H


d10 H


View Answer 5 H

A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is___________?


a3500 mH


b350 mH


c 250 mH


d 150 mH


View Answer 350 mH

Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla


a100 N


b400 N


c600 N


d1000 N


View Answer 100 N

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?


a20 Wb


b 2 Wb


c0.2 Wb


d 0.02 Wb


View Answer 0.02 Wb

Two 300 uH coils in series without mutual coupling have a total inductance of___________?


a300 uH


b 600 uH


c 150 uH


d 75 uH


View Answer 300 uH

Which of the fpllowing inductor will have the least eddy current losses ?


aAir core


bLaminated iron core


c Iron core


dPowdered iron core


View Answer Air core

A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?


a0.01 s


b0.1 s


c0.5 s


d 5 s


View Answer 0.5 s

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