1) The use of permanent magnets is. not made in_____________? a. magnetoes b. energy meters c. transformers d. loud-speakers
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2) Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________? a. 2 x 1(T2 N/m) b. 2 x KT3 N/m c. 2 x 10″5 N/m d. 2x 1(T7 N/m)
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3) The main constituent of permalloy is_____________? a. cobalt b. chromium c. nickel d. tungsten
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4) Paramagnetic materials have relative permeability________________? a. slightly less than unity b. equal to unity c. slightly more than unity d. equal to that ferromagnetic mate rials
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5) Gilbert is a unit of_______________? a. electromotive force b. magnetomotive force c. conductance d. permittivity
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6) Substances which have permeability less than the permeability of free space are known as_____________? a. ferromagnetic b. paramagnetic c. diamagnetic d. bipolar
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7) In the left hand rule, forefinger always represents______________? a. voltage b. current c. magnetic field d. direction of force on the conductor
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8) Ferrites are a sub-group of_______________? a. non-magnetic materials b. ferro-magnetic materials c. paramagnetic materials d. ferri-magnetic materials
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9) Reciprocal of permeability is____________? a. reluctivity b. susceptibility c. permittivity d. conductance
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10) Which of the following is the unit of magnetic flux density ? a. weber b. lumens c. tesla d. none of the above
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