Electromagnetics Field (3140912) MCQs

MCQs of Magnetic forces, materials and inductance

Showing 51 to 60 out of 171 Questions
3 4 5 6 7 8
51.
Which materials are a inferior conductors of magnetic flux than air?
(a) Ferromagnetic
(b) Paramagnetic
(c) Diamagnetic
(d) Dielectric
Answer:

Option (c)

52.
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
(a) Circular
(b) Triangular
(c) Rectangular
(d) None of above
Answer:

Option (c)

53.
Rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
(a) M
(b) M/2
(c) 2M
(d) M/4
Answer:

Option (b)

54.
A keeper is used to
(a) Change the direction of magnetic lines
(b) Amplify flux
(c) Restore lost flux
(d) Provide a closed path for flux
Answer:

Option (d)

55.
Magnetic moment is a
(a) Pole strength
(b) Universal constant
(c) Scalar quantity
(d) Vector quantity
Answer:

Option (d)

56.
The change of cross-sectional area of conductor in magnetic field will affect
(a) Reluctance of conductor
(b) Resistance of conductor
(c) Both (a) and (b) in same way
(d) None of above
Answer:

Option (c)

57.
The uniform magnetic field is a
(a) Field of a set of parallel conductors
(b) Field of a single conductor
(c) Field in which all lines of magnetic flux are parallel and equidistant
(d) None of above
Answer:

Option (c)

58.
The magneto motive force is
(a) Voltage across the two ends of exciting coil
(b) Flow of an electric current
(c) Sum of all currents embraced by one line of magnetic field
(d) Passage of magnetic field through an exciting coil
Answer:

Option (c)

59.
Pick up the correct statement
(a) Magnetic flux inside an exciting coil is lower than its outside surface
(b) Magnetic flux inside an exciting coil is zero
(c) Magnetic flux inside the exciting coil is greater than its outside surface
(d) Magnetic flux inside the exciting coil is same as on its outside surface
Answer:

Option (d)

60.
Certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic flux density B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
(a) Decreases
(b) Increases
(c) Remains same
(d) First increases and then decreases
Answer:

Option (b)

Showing 51 to 60 out of 171 Questions
3 4 5 6 7 8