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

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b32 A/s

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c16 A/s

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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

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b38 mH

✓


c40 mH

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d48 mH

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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

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c24mH

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d48mH

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View Answer 3 mH

Which of the following is unit of inductance ?


aOhm

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bHenry

✓


cAmpere turns

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dWebers/metre

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View Answer Henry

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


aCapacitance

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bInductance

✓


cResistance

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dAll of the above

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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

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bthe laminations are insulated from each other

✓


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

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dthe laminations are stacked vertfcally

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


aflux density of the magnetic field

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bamount of flux cut

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camount of flux linkages

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d rate of change of flux-linkages

✓



Which of the following is not a unit of inductance ?


aHenry

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bCoulomb/volt ampere

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cVolt second per ampere

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dAll of the above

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View Answer Coulomb/volt ampere

Mutually inductance between two magnetically-coupled coils depends on____________?


apermeability of the core

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b the number of their turns

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ccross-sectional area of their common core

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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

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bLenz

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cNewton

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dCoulomb

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View Answer Lenz

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