Realtime Magnetic Circuit Multiple choice Questions and Answers pdf

6. Relative permeability of vacuum is
(a) 1
(b) 1 H/m
(c) 1/4JI
(d) 4n x 10-' H/m
Ans: a

7. Permanent magnets are normally made of
(a) alnico alloys  
(b) aluminium
(c) cast iron
(d) wrought iron
Ans: a

8. Energy stored by a coil is doubled when its current is increased by percent.
(a) 25
(b) 50
(c)41.4
(d) 100
Ans: c

9. Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.
(a) high, high
(b) low, high
(c) high, low
(d) low, low
Ans: c

10. 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
Ans: b

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