A Best Way To Crack Gorenment Job Exams

Electrical Engineering Objective Questions { Material And Components }



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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