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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Basic Electrical Technology  >  Test: Ohm’s Law For a Magnetic Circuit - Electrical Engineering (EE) MCQ

Test: Ohm’s Law For a Magnetic Circuit - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Basic Electrical Technology - Test: Ohm’s Law For a Magnetic Circuit

Test: Ohm’s Law For a Magnetic Circuit for Electrical Engineering (EE) 2024 is part of Basic Electrical Technology preparation. The Test: Ohm’s Law For a Magnetic Circuit questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Ohm’s Law For a Magnetic Circuit MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Ohm’s Law For a Magnetic Circuit below.
Solutions of Test: Ohm’s Law For a Magnetic Circuit questions in English are available as part of our Basic Electrical Technology for Electrical Engineering (EE) & Test: Ohm’s Law For a Magnetic Circuit solutions in Hindi for Basic Electrical Technology course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Ohm’s Law For a Magnetic Circuit | 10 questions in 10 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Basic Electrical Technology for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Ohm’s Law For a Magnetic Circuit - Question 1
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 Ohm’s law for magnetic circuits is _________

Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 1

Ohm’s law for magnetic circuits states that the MMF is directly proportional to the magnetic flux where reluctance is the constant of proportionality.

Test: Ohm’s Law For a Magnetic Circuit - Question 2
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What happens to the MMF when the magnetic flux decreases?

Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 2

Ohm’s law for magnetic circuit’s states that the MMF is directly proportional to the magnetic flux hence as the magnetic flux decreases, the MMF also decreases.

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Test: Ohm’s Law For a Magnetic Circuit - Question 3
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 Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.

Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 3

We know that:
F=ϕS
Substituting the given values from the question, we get MMF= 15At.

Test: Ohm’s Law For a Magnetic Circuit - Question 4
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A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the flux density of the ring.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 4

From the given question:
Flux density= 800*10-6/500*106=1.6 Wb/m2.

Test: Ohm’s Law For a Magnetic Circuit - Question 5
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A ring having a cross-sectional area of 500 mm2, a circumference of and ϕ=800microWb 400 mm has a coil of 200 turns wound around it. Calculate the reluctance.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 5

From the given question:
Flux density= 800*10-6/500*106=1.6 Wb/m2.
Reluctance= 0.4/(380*4*pi*10-7*10-4*5)=1.68 * 106 A/Wb.

Test: Ohm’s Law For a Magnetic Circuit - Question 6
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A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetomotive force.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 6

We know that:
F=ϕS
Substituting the given values from the question, we get F= 1342At.

Test: Ohm’s Law For a Magnetic Circuit - Question 7
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A ring having a cross-sectional area of 500 mm2 , a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetising current.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 7

We know that:
F=ϕS
Substituting the given values from the question, we get F= 1342At.
The magnetic current is:
I=F/N
Substituting the values from the question, we get I=6.7A.

Test: Ohm’s Law For a Magnetic Circuit - Question 8
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Can we apply Kirchhoff’s was to magnetic circuits?
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 8

Magnetic circuits have an equivalent to the potential difference of electric circuits. This is the magnetic potential difference which allows us to apply Kirchhoff’s laws to magnetic circuit analysis.

Test: Ohm’s Law For a Magnetic Circuit - Question 9
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What is MMF?
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 9

MMF stands for magnetomotive force. It is the sum of the magnetizing forces along a circuit.

Test: Ohm’s Law For a Magnetic Circuit - Question 10
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The equivalent of the current I in magnetic ohm’s law is?
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 10

The equivalent of current in magnetic ohm’s law is flux as:
V=IR is equivalent to F=ϕS.

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