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Magnetic Circuit - Interview Questions and Answers

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21. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
A. E.m.f.
B. Current
C. Current density
D. Conductivity
Explanation:
22. Those materials are well suited for making permanent magnets which have______retentivity and _______coercivity.
A. low, high
B. high, high
C. high, low
D. low, low
Explanation:
23. The rate of rise of current through an inductive coil is maximum
A. at 63.2% of its maximum steady value
B. at the start of the current flow
C. after one time constant
D. near the final maximum value of current
Explanation:
24. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
A. zero
B. small
C. large
D. none of the above
Explanation:
25. The unit of retentivity is
A. weber
B. weber/sq. m
C. ampere turn/metre
D. ampere turn
Explanation:
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