36. Eddy current losses may be minimized by
A. decreasing the resistivity of magnetic medium
B. increasing the resistivity of magnetic medium
C. decreasing the permeability of magnetic medium
D. increasing the permeability of magnetic medium
37. Maximum relative permeability pr(max) for iron is
A.3000
B.5000
C.7000
D.105
38. Maximum relative permeability pr(max) for numetal is
A.3000
B.5000
C.105
D. 8 x 105
39. The most important use of soft magnetic materials is in
A. meters
B. transducers
C. transformers and machine cores
D. transformer winding wire
40. Transormer cores used at microwave frequencies are generally made of
A. copper
B. ferrites
C. cilicon
D. supermally
41. Lowest hysteresis loss results in
A. platinum cobalt
B. Mn-Zn ferrite
C. supermalloy
D. alnico
42. Which of following is the Ohm's law relating the electric field E, conductivity a and current density J?
A. J = ?a
B.(d) J = GE2
C.
D.
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