MCQs of Magnetic forces, materials and inductance (Electromagnetics Field - 3140912)

Showing 61 to 70 out of 171 Questions

61.

Magnetic reluctance of a material

(a)	Decreases with increasing cross sectional area of material
(b)	Increases with increasing cross sectional area of material
(c)	Does not vary with increasing cross sectional area of material
(d)	Insufficient data

62.

Initial permeability of an iron rod is

(a)	Highest permeability of the iron rod
(b)	Lowest permeability of the iron rod
(c)	Permeability at the end of the iron rod
(d)	Permeability almost in non-magnetized state

63.

How does the magnetic compass needle behave in a magnetic field?

(a)	A position right angle to magnetic field
(b)	Starts rotating
(c)	A position which follows a line of magnetic flux
(d)	None of above

64.

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

65.

Stray line of magnetic flux is defined as a

(a)	Line vertical to the flux lines
(b)	Mean length of a ring shaped coil
(c)	Line of magnetic flux in a non-uniform field
(d)	Line of magnetic flux which does not follow the designed path

66.

Bar magnet has

67.

Which of the following materials are diamagnetic?

68.

Which of the following materials are not very important for engineering applications ?

69.

Which of the following materials has highest saturation value?

70.

Magnetic materials exhibit the property of magnetization because of

Showing 61 to 70 out of 171 Questions