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Electromagnetic Induction - Interview Questions and Answers

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36. Which of the following is not a unit of inductance ?
A. Henry
B. Coulomb/volt ampere
C. Volt second per ampere
D. All of the above
Explanation:
37. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
A. unaffected
B. doubled
C. halved
D. quadrupled
Explanation:
38. If current in a conductor increases then according to Lenz's law self-induced voltage will
A. aid the increasing current
B. tend to decrease the amount of cur-rent
C. produce current opposite to the in-creasing current
D. aid the applied voltage
Explanation:
39. The law that the induced e.m.f. and current always oppose the cause producing them is due to
A. Faraday
B. Lenz
C. Newton
D. Coulomb
Explanation:
40. Air-core coils are practically free from
A. hysteresis losses
B. eddy current losses
C. both (a) and (b)
D. none of the above
Explanation:
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