Top 250+ Solved Electromagnetic Theory MCQ Questions Answer
Q. The magnetic reluctance of a material
a. decreases with increasing cross sectional area of material
b. increases with increasing cross-sec-tional area of material
c. does not vary with increasing cross-sectional area of material
d. any of the above
Q. The initial permeability of an iron rod is
a. the highest permeability of the iron rod
b. the lowest permeability of the iron rod
c. the permeability at the end of the iron rod
d. the permeability almost in non-magnetised state
Q. How does the magnetic compass needle behave in a magnetic field ?
a. It assures a position right angle to magnetic field
b. It starts rotating
c. It assures a position which follows a line of magnetic flux
d. None of the above
Q. In a simple magnetic field the strength of magnet flux
a. is constant and has same value in energy part of the magnetic field
b. increases continuously from initial value to final value
c. decreases continuously from initial value to final value
d. first increases and then decreases till it becomes zero
Q. The stray line of magnetic flux is defined as
a. a line vertical to the flux lines
b. the mean length of a ring shaped coil
c. a line of magnetic flux in a non-uniform field
d. a line of magnetic flux which does not follow the designed path
Q. The bar magnet has
a. the dipole moment
b. monopole moment
c. (a) and (b) both
d. none of the above
Q. Which of the following materials are dia-magnetic ?
a. Silver
b. Copper
c. Silver and copper
d. Iron
Q. Which of the following type of materials are not very important for engineeringapplications ?
a. Ferromagnetic
b. Paramagnetic
c. Diamagnetic
d. None of the above
Q. The susceptibility of paramagnetic materials generally lies between
a. KT3 and 1CT6
b. 1CT3 and 1CT7
c. KT4 and KT8
d. 10"2 and KT5
Q. For which of the following materials the saturation value is the highest ?
a. Ferromagnetic materials
b. Paramagnetic materials
c. Diamagnetic materials
d. Ferrites
Q. The magnetic materials exhibit the property of magnetisation because of
a. orbital motion of electrons
b. spin of electrons
c. spin of nucleus
d. either of these
Q. For which of the following materials the net magnetic moment should be zero ?
a. Diamagnetic materials
b. Ferrimagnetic materials
c. Antiferromagnetic materials
d. Antiferrimagnetic materials
Q. The attraction capacity of electromagnet will increase if the
a. core length increases i
b. core area increases
c. flux density decreases
d. flux density increases
Q. Which of the following statements is correct ?
a. The conductivity of ferrites is better than ferromagnetic materials
b. The conductivity of ferromagnetic materials is better than ferrites
c. The conductivity of ferrites is very high
d. The conductivity of ferrites is same as that of ferromagnetic materials