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Electromagnetic Induction - Interview Questions and Answers

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6. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
A. 6 H
B. 8 H
C. 12 H
D. 24 H
Explanation:
7. Which of the following circuit elements will oppose the change in circuit current ?
A. Capacitance
B. Inductance
C. Resistance
D. All of the above
Explanation:
8. The inductance of a coil will increase under all the following conditions except
A. when more length for the same number of turns is provided
B. when the number of turns of the coil increase
C. when more area for each turn is provided
D. when permeability of the core increases
Explanation:
9. In case of an inductance, current is proportional to
A. voltage across the inductance
B. magnetic field
C. both (a) and (b)
D. neither (a) nor (b)
Explanation:
10. A laminated iron core has reduced eddy-current losses because
A. more wire can be used with less D.C. resistance in coil
B. the laminations are insulated from each other
C. the magnetic flux is concentrated in the air gap of the core
D. the laminations are stacked vertf-cally
Explanation:
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