Test: Reluctance


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

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

Reciprocal of reluctance is __________

Detailed Solution for Test: Reluctance - Question 1

The reciprocal of reactance is permeance. It is the ability of a material to allow the passage of magnetic lines of flux.

Test: Reluctance - Question 2

Reluctance is _________ to the area of cross section the material.

Detailed Solution for Test: Reluctance - Question 2

The formula for reluctance is:
S = l/(µ0 µr*A).
From the formula, we can see that reluctance is inversely proportional to the area of cross section of the material.

Test: Reluctance - Question 3

When the area of cross section of the material increases, what happens to reluctance?

Detailed Solution for Test: Reluctance - Question 3

Reluctance is inversely proportional to the area of cross section of the material hence as area increases, reluctance decreases.

Test: Reluctance - Question 4

The electrical equivalent of reluctance is?

Detailed Solution for Test: Reluctance - Question 4

Resistance is the opposition to the flow of charge, similarly reluctance is the opposition to the flow of magnetic flux.

Test: Reluctance - Question 5

As the magnetic flux density increases, the reluctance _____________

Detailed Solution for Test: Reluctance - Question 5

Reluctance is inversely proportional to the magnetic flux density, hence as magnetic flux density increases, reluctance decreases.

Test: Reluctance - Question 6

Reluctance is _______ to the length of the material.

Detailed Solution for Test: Reluctance - Question 6

The formula for reluctance is:
S = l/µ0 µr*A.
From the formula, we can see that reluctance is directly proportional to the length of the material.

Test: Reluctance - Question 7

When the length of the material increases, what happens to reluctance?

Detailed Solution for Test: Reluctance - Question 7

Reluctance is directly proportional to the length of the material hence as length increases, reluctance also increases.

Test: Reluctance - Question 8

Unit of reluctance is?

Detailed Solution for Test: Reluctance - Question 8

Reluctance is magnetomotive force per unit flux,
So unit of reluctance = unit of MMF / unit of magnetic flux = A/Wb.

Test: Reluctance - Question 9

As the magnetic field strength increases, reluctance?

Detailed Solution for Test: Reluctance - Question 9

Reluctance is directly proportional to the strength of the magnetic field, hence as the strength of magnetic field increases, the reluctance increases.

Test: Reluctance - Question 10

Calculate the reluctance when the magnetomotive force is 10A turns and the flux is 5Wb.

Detailed Solution for Test: Reluctance - Question 10

We know that:
F = ϕ*S
Substituting the given values from the question:
S = 2A/Wb.

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