Test: Magnetic Energy & Circuits - Electrical Engineering (EE) MCQ

# Test: Magnetic Energy & Circuits - Electrical Engineering (EE) MCQ

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## 10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) - Test: Magnetic Energy & Circuits

Test: Magnetic Energy & Circuits for Electrical Engineering (EE) 2024 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Magnetic Energy & Circuits questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Magnetic Energy & Circuits MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Magnetic Energy & Circuits below.
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Test: Magnetic Energy & Circuits - Question 1

### The magnetic energy of a magnetic material is given by

Detailed Solution for Test: Magnetic Energy & Circuits - Question 1

Explanation: The magnetic energy of a material is given by half of the product of the magnetic flux density and the magnetic field intensity. It is represented as BH/2. Since B = μH, we can also write as μH2 or B2/2μ.

Test: Magnetic Energy & Circuits - Question 2

### The induced emf in a material opposes the flux producing it. This is

Detailed Solution for Test: Magnetic Energy & Circuits - Question 2

Explanation: The induced emf in a material under the influence of a magnetic field will oppose the flux that produces it. This is indicated by a negative sign in the emf equation. This phenomenon is called Lenz law.

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Test: Magnetic Energy & Circuits - Question 3

### The energy in a magnetic material is due to which process?

Detailed Solution for Test: Magnetic Energy & Circuits - Question 3

Explanation: The energy in a magnetic material is due to the formation of magnetic dipoles which are held together due to magnetic force. This gives energy to the material. Hence it is due to magnetization process.

Test: Magnetic Energy & Circuits - Question 4

The flux lines of two energised coils overlapping on each other will give

Detailed Solution for Test: Magnetic Energy & Circuits - Question 4

Explanation: Flux lines are the magnetic lines of force of a magnetic material. Since the flux is overlapping, the total flux of the two coils together will be high. Thus it is an aiding flux. Also this type of overlapping is possible only when the two coils are back to back or in series connection.

Test: Magnetic Energy & Circuits - Question 5

The resistance in a magnetic material is called as

Detailed Solution for Test: Magnetic Energy & Circuits - Question 5

Explanation: The reluctance of a magnetic material is the ability of the material to oppose the magnetic flux. It is the ratio of the magnetic motive force mmf to the flux.

Test: Magnetic Energy & Circuits - Question 6

Calculate the reluctance of the material with a mmf of 3.5 units and flux of 7units.

Detailed Solution for Test: Magnetic Energy & Circuits - Question 6

Explanation: The reluctance is defined as the ratio of the mmf and the flux. It is given by S = mmf/φ. On substituting mmf = 3.5 and φ = 7, we get S = 3.5/7 = 0.5 units.

Test: Magnetic Energy & Circuits - Question 7

Which of the following relations is correct?

Detailed Solution for Test: Magnetic Energy & Circuits - Question 7

Explanation: The reluctance is also defined by the ratio of the current element to the flux. In other words, mmf = NI. Thus S = NI/φ. We get the relation NI = Sφ.

Test: Magnetic Energy & Circuits - Question 8

Calculate the reluctance of a material with length 2π x 10-4 in air with area 0.5.

Detailed Solution for Test: Magnetic Energy & Circuits - Question 8

Explanation: The reluctance is given by S = L/μ A, where L is the length, A is the area and μ is the permeability. On substituting L = 2π x 10-4, A = 0.5 and μ = 4π x 10-7, we get S = 103/(2×0.5) = 1000 units.

Test: Magnetic Energy & Circuits - Question 9

Ampere turn is equivalent to which element?

Detailed Solution for Test: Magnetic Energy & Circuits - Question 9

Explanation: Ampere turn refers to the current element, which is the product of the turns and the current. It is given by NI. From the definition of reluctance, S = NI/φ. Thus NI = Sφ is the best equivalent.

Test: Magnetic Energy & Circuits - Question 10

The line integral of the magnetic field intensity is given by

Detailed Solution for Test: Magnetic Energy & Circuits - Question 10

Explanation: The line integral of H is given by ∫H. dl. From Ampere law it can be related to the current density and hence the current element NI for a coil of N turns. Thus, ∫H. dl = NI.

## Electromagnetic Fields Theory (EMFT)

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## Electromagnetic Fields Theory (EMFT)

11 videos|45 docs|73 tests