Top 250+ Solved Electromagnetic Theory MCQ Questions Answer
Q. Paramagnetic materials have relative permeability
a. slightly less than uuity
b. equal to unity
c. slightly more than unity
d. equal to that ferromagnetic mate rials
Q. Substances which have permeability less than the permeability of free space are knownas
a. ferromagnetic
b. paramagnetic
c. diamagnetic
d. bipolar
Q. Two infinitely long parallel conductors in vacuum anf' separated 1 metre between centres >rhen a current of 1 ampere flows thn. ugh each conductor, produce on each otLer 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)
Q. In the left hand rule, forefinger always represents
a. voltage
b. current
c. magnetic field
d. direction of force on the conductor
Q. Which of the following is a ferromagnetic material ?
a. Tungsten
b. Aluminium
c. Copper
d. Nickel
Q. Ferrites are a sub-group of
a. non-magnetic materials
b. ferro-magnetic materials
c. paramagnetic materials
d. ferri-magnetic materials
Q. Gilbert is a unit of
a. electromotive force
b. magnetomotive force
c. conductance
d. permittivity
Q. The working of a meter is based on the use of a permanent magnet. In order to protectthe meter functioning from stray magnetic fields
a. meter is surrounded by strong magnetic fields
b. a soft iron shielding is used
c. a plastic shielding is provided
d. a shielding of anon-magnetic material is used
Q. The relative permeability is less than unity is case of
a. ferromagnetic materials
b. ferrites
c. non-ferrous materials
d. diamagnetic materials
Q. Which of the following is the unit of magnetic flux density ?
a. weber
b. lumens
c. tesla
d. none of the above
Q. The magnetism left in the iron after exciting field has been removed is known as
a. permeance
b. residual magnetism
c. susceptance
d. reluctance
Q. Which of the following is expected to have the maximum permeability ?
a. Brass
b. Copper
c. Zinc
d. Ebonite