Test: Magnetic Materials


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10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Magnetic Materials

Test: Magnetic Materials for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Magnetic Materials questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Magnetic Materials MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Magnetic Materials below.
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Test: Magnetic Materials - Question 1

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

Detailed Solution for Test: Magnetic Materials - Question 1

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

Test: Magnetic Materials - Question 2

The magnetic materials follow which law?

Detailed Solution for Test: Magnetic Materials - Question 2

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

Test: Magnetic Materials - 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.

Detailed Solution for Test: Magnetic Materials - Question 3

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.

Test: Magnetic Materials - Question 4

In which materials the magnetic anisotropy is followed?

Detailed Solution for Test: Magnetic Materials - Question 4

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.

Test: Magnetic Materials - Question 5

Piezoelectric effect is analogous to which phenomenon?

Detailed Solution for Test: Magnetic Materials - Question 5

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.

Test: Magnetic Materials - Question 6

The converse of magnetostriction is called the

Detailed Solution for Test: Magnetic Materials - Question 6

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.

Test: Magnetic Materials - Question 7

The materials having very small susceptibility at all temperatures are

Detailed Solution for Test: Magnetic Materials - Question 7

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

Test: Magnetic Materials - 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.

Detailed Solution for Test: Magnetic Materials - Question 8

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.

Test: Magnetic Materials - Question 9

The susceptibility is independent of temperature in which material?

Detailed Solution for Test: Magnetic Materials - Question 9

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.

Test: Magnetic Materials - Question 10

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

Detailed Solution for Test: Magnetic Materials - Question 10

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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