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Magnetic Circuit - Interview Questions and Answers

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6. Permanent magnets are normally made of
A. alnico alloys
B. aluminium
C. cast iron
D. wrought iron
Explanation:
7. Energy stored by a coil is doubled when its current is increased by percent.
A. 25
B. 50
C. 41.4
D. 100
Explanation:
8. Relative permeability of vacuum is
A. 1
B. 1 H/m
C. 1/4JI
D. 4n x 10-' H/m
Explanation:
9. When both the inductance and resistance of a coil are doubled the value of
A. time constant remains unchanged
B. initial rate of rise of current is doubled
C. final steady current is doubled
D. time constant is halved
Explanation:
10. A ferrite core has less eddy current loss than an iron core because
A. ferrites have high resistance
B. ferrites are magnetic
C. ferrites have low permeability
D. ferrites have high hysteresis
Explanation:
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