Electrical Engineering MCQs

Page No. 179

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?


a64 A/s


b32 A/s


c16 A/s


d4 A/s


View Answer 4 A/s

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?


a32 mH


b38 mH


c40 mH


d48 mH


View Answer 38 mH

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?


a3 mH


b12 mH


c24mH


d48mH


View Answer 3 mH

Which of the following is unit of inductance ?


aOhm


bHenry


cAmpere turns


dWebers/metre


View Answer Henry

Which of the following circuit elements will oppose the change in circuit current ?


aCapacitance


bInductance


cResistance


dAll of the above


View Answer Inductance

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


amore wire can be used with less D.C. resistance in coil


bthe laminations are insulated from each other


cthe magnetic flux is concentrated in the air gap of the core


dthe laminations are stacked vertfcally



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


aflux density of the magnetic field


bamount of flux cut


camount of flux linkages


d rate of change of flux-linkages



Which of the following is not a unit of inductance ?


aHenry


bCoulomb/volt ampere


cVolt second per ampere


dAll of the above


View Answer Coulomb/volt ampere

Mutually inductance between two magnetically-coupled coils depends on____________?


apermeability of the core


b the number of their turns


ccross-sectional area of their common core


dall of the above


View Answer all of the above`

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


aFaraday


bLenz


cNewton


dCoulomb


View Answer Lenz

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