Tricky Magnetic Circuit Multiple choice Questions and Answers pdf

21. The property of a material which opposes the creation of magnetic flux in it is known as
(a) reluctivity
(b) magnetomotive force
(c) permeance
(d)     reluctance
Ans: d

22. The unit of retentivity is
(a)     weber
(b)     weber/sq. m
(c) ampere turn/metre
(d) ampere turn
Ans: b

23. Reciprocal of reluctance is
(a) reluctivity
(b) permeance
(c) permeability  
(d) susceptibility
Ans: b

24. 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
Ans: b

25. The unit of reluctance is
(a) metre/henry  
(b) henry/metre
(c) henry
(d) 1/henry
Ans: d

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