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Test: Magnetic Materials


10 Questions MCQ Test Electromagnetic Theory | Test: Magnetic Materials


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This mock test of Test: Magnetic Materials for Electrical Engineering (EE) helps you for every Electrical Engineering (EE) entrance exam. This contains 10 Multiple Choice Questions for Electrical Engineering (EE) Test: Magnetic Materials (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Magnetic Materials quiz give you a good mix of easy questions and tough questions. Electrical Engineering (EE) students definitely take this Test: Magnetic Materials exercise for a better result in the exam. You can find other Test: Magnetic Materials extra questions, long questions & short questions for Electrical Engineering (EE) on EduRev as well by searching above.
QUESTION: 1

The presence of parallel alignment of magnetic dipole moment is given by which materials?

Solution:

Answer: b
Explanation: The ferromagnetic materials are characterized by parallel alignment of magnetic dipole moments. Their susceptibility is very large.

QUESTION: 2

The magnetic materials follow which law?

Solution:

Answer: d
Explanation: Generally, the ferromagnetic, paramagnetic and diamagnetic materials follow the Curie Weiss law, which relates the magnetization and the applied field.

QUESTION: 3

Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units.

Solution:

Answer: d
Explanation: From Curie law, the internal field of a magnetic material is given by H = Ho + χ M, where χ is the molecular field constant. Put χ = 0.1, M = 74 and Ho = 12, we get H = 12 + (0.1)74 = 19.4 units.

QUESTION: 4

In which materials the magnetic anisotropy is followed?
Solution:

Answer: c
Explanation: In materials like iron, the magnetic properties depend on the direction in which they are measured. This is magnetic anisotropy. The material iron is a ferromagnetic material type.

QUESTION: 5

Piezoelectric effect is analogous to which phenomenon?
Solution:

Answer: b
Explanation: The piezoelectric effect is the mechanical strain caused on a material like quartz when subjected to an electric field. The same is observed in a ferromagnetic material called magnetostriction.

QUESTION: 6

The converse of magnetostriction is called the
Solution:

Answer: c
Explanation: When a strain is applied, the change in magnetic field is observed. This is the converse of the magnetostriction phenomenon and is called Villari effect.

QUESTION: 7

The materials having very small susceptibility at all temperatures are
Solution:

Answer: a
Explanation: In antiferromagnetic materials, the susceptibility will decrease with increase in temperature. They have relatively small susceptibility at all temperatures.

QUESTION: 8

Find the susceptibility when the curie constant is 0.2 and the difference in critical temperature and paramagnetic curie temperature is 0.01.
Solution:

Answer: b
Explanation: The susceptibility in magnetic materials is given by χm = C/(T-θ), where C is the curie constant, T is the critical temperature and θ is the paramagnetic curie temperature. Put C = 0.2 and T-θ = 0.01, thus we get susceptibility as 0.2/0.01 = 20.

QUESTION: 9

The susceptibility is independent of temperature in which material?
Solution:

Answer: c
Explanation: In the diamagnetic materials, the susceptibility is very small and negative. Thus the susceptibility will be independent of the temperature. The atoms of solids having closed shells and metals like gold have this property.

QUESTION: 10

In ferromagnetic materials the susceptibility is infinity. State True/False 
Solution:

Answer: a
Explanation: The ferromagnetic materials are iron, nickel, cobalt which are highly attracted by magnetic field. Thus their susceptibility is also very high and nearing infinity. Also ferrimagnetics have infinite susceptibility.

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