Magnetic Circuit MCQs Questions Answers [TOP 50]: A magnetic circuit refers to the path followed by magnetic flux through a material or a series of materials. It is analogous to an electrical circuit, where the flow of current is determined by the electrical resistance and electromotive force. In a magnetic circuit, the flow of magnetic flux is governed by magnetic reluctance and magnetomotive force.
The key components of a magnetic circuit are:
1. Magnetic Field Strength: Magnetic field strength (H) represents the intensity of the magnetic field within the magnetic circuit. It is defined as the amount of magnetomotive force (MMF) per unit length of the magnetic path and is measured in Ampere-turns per meter (A-turn/m).
2. Magnetomotive Force: Magnetomotive force (MMF) is the driving force that establishes the magnetic field within the magnetic circuit. It is analogous to voltage in an electrical circuit and is measured in Ampere-turns (A-turn).
3. Magnetic Reluctance: Magnetic reluctance is the property of a material that opposes the establishment of magnetic flux. It is analogous to electrical resistance and is measured in Ampere-turns per Weber (A-turn/Wb). It is determined by the dimensions, material properties, and the presence of air gaps or other non-magnetic substances in the magnetic path.
4. Magnetic Permeability: Magnetic permeability (μ) is a measure of a material’s ability to conduct magnetic flux. It is defined as the ratio of the magnetic flux density (B) to the magnetic field strength (H) and is measured in Henry per meter (H/m). Different materials have different permeabilities, and it affects the overall magnetic behavior of the circuit.
Magnetic circuits problems and solutions | What is Magnetic Circuit?
1. Which law relates the magnetic field strength (H), magnetic flux density (B), and magnetic permeability (μ) in a magnetic circuit?
a) Ohm’s law
b) Faraday’s law
c) Ampere’s law
d) Gauss’s law
Answer: c) Ampere’s law
2. Magnetic permeability is a measure of:
a) The strength of the magnetic field
b) The ability of a material to conduct magnetic flux
c) The resistance of a material to magnetic flux
d) The voltage induced in a circuit by changing magnetic flux
Answer: b) The ability of a material to conduct magnetic flux
3. The unit of magnetic flux density (B) is:
a) Tesla
b) Ampere
c) Henry
d) Weber
Answer: a) Tesla
4. The magnetic circuit is analogous to which of the following electrical circuit elements?
a) Resistor
b) Capacitor
c) Inductor
d) Transformer
Answer: c) Inductor
5. In a magnetic circuit, the magnetic flux is analogous to which quantity in an electrical circuit?
a) Current
b) Voltage
c) Resistance
d) Power
Answer: b) Voltage
6. In a magnetic circuit, the magnetomotive force (MMF) is analogous to which quantity in an electrical circuit?
a) Current
b) Voltage
c) Resistance
d) Power
Answer: a) Current
7. The reluctance of a magnetic circuit is analogous to which quantity in an electrical circuit?
a) Conductance
b) Resistance
c) Capacitance
d) Inductance
Answer: b) Resistance
8. The magnetic field strength (H) is defined as:
a) The force experienced by a unit magnetic pole
b) The number of magnetic field lines passing through a unit area
c) The product of magnetic flux density and magnetic permeability
d) The magnetomotive force per unit length of the magnetic path
Answer: d) The magnetomotive force per unit length of the magnetic path
9. Which material has the highest magnetic permeability?
a) Air
b) Copper
c) Iron
d) Aluminum
Answer: c) Iron
10. The reluctance of a magnetic circuit is inversely proportional to:
a) Magnetic flux
b) Magnetic field strength
c) Magnetic permeability
d) Magnetomotive force
Answer: c) Magnetic permeability
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11. The magnetic flux in a magnetic circuit is directly proportional to:
a) Magnetic field strength
b) Magnetic permeability
c) Reluctance
d) Magnetomotive force
Answer: d) Magnetomotive force
12. In a closed magnetic circuit, the total magnetic flux is:
a) Zero
b) Constant
c) Changing
d) Depends on the material
Answer: b) Constant
13. The total magnetomotive force in a series magnetic circuit is equal to:
a) The sum of the individual magnetomotive forces
b) The average of the individual magnetomotive forces
c) The product of the individual magnetomotive forces
d) None of the above
Answer: a) The sum of the individual magnetomotive forces
14. In a parallel magnetic circuit, the total reluctance is equal to:
a) The sum of the individual reluctances
b) The average of the individual reluctances
c) The product of the individual reluctances
d) None of the above
Answer: b) The average of the individual reluctances
15. In a magnetic circuit, the magnetic field lines tend to follow the path of:
a) Maximum magnetic permeability
b) Minimum magnetic permeability
c) Maximum magnetic field strength
d) Minimum magnetic field strength
Answer: a) Maximum magnetic permeability
16. The magnetic field strength (H) inside a magnetic material is:
a) Higher than outside the material
b) Lower than outside the material
c) Same as outside the material
d) Depends on the material
Answer: a) Higher than outside the material
17. The magnetic field strength (H) in a magnetic circuit is inversely proportional to:
a) Magnetic flux
b) Magnetic permeability
c) Reluctance
d) Magnetomotive force
Answer: c) Reluctance
18. The concept of magnetic circuit is useful in the design of:
a) Transformers
b) Electric motors
c) Inductors
d) All of the above
Answer: d) All of the above
19. Which of the following is true for a magnetic circuit with a gap?
a) The reluctance is lower compared to a closed magnetic circuit
b) The reluctance is higher compared to a closed magnetic circuit
c) The magnetic flux is higher compared to a closed magnetic circuit
d) The magnetic flux is lower compared to a closed magnetic circuit
Answer: b) The reluctance is higher compared to a closed magnetic circuit
20. The main purpose of a magnetic circuit is to:
a) Store magnetic energy
b) Control the flow of magnetic flux
c) Generate an electromotive force
d) Generate a magnetic field
Answer: b) Control the flow of magnetic flux
Magnetic circuits problems and solutions pdf | parallel magnetic circuit problems and solutions pdf
21. In a magnetic circuit, the magnetic field intensity (H) is measured in:
a) Ohms
b) Amperes per meter
c) Volts
d) Newtons
Answer: b) Amperes per meter
22. The magnetic flux is defined as:
a) The force experienced by a magnetic pole
b) The number of magnetic field lines passing through a surface
c) The product of magnetic field strength and magnetic permeability
d) The magnetomotive force per unit area
Answer: b) The number of magnetic field lines passing through a surface
23. The unit of magnetic reluctance is:
a) Tesla
b) Ampere
c) Henry
d) Permeability
Answer: d) Permeability
24. Which material has the lowest magnetic permeability?
a) Air
b) Copper
c) Iron
d) Aluminum
Answer: a) Air
25. The concept of magnetic reluctance is similar to which concept in electrical circuits?
a) Resistance
b) Conductance
c) Capacitance
d) Inductance
Answer: a) Resistance
26. In a series magnetic circuit, the total magnetic flux is:
a) The sum of the individual fluxes
b) The average of the individual fluxes
c) The product of the individual fluxes
d) None of the above
Answer: a) The sum of the individual fluxes
27. In a parallel magnetic circuit, the total reluctance is:
a) The sum of the individual reluctances
b) The average of the individual reluctances
c) The product of the individual reluctances
d) None of the above
Answer: a) The sum of the individual reluctances
28. In a magnetic circuit, the ratio of magnetic flux to magnetomotive force is called:
a) Magnetic field strength
b) Magnetic permeability
c) Magnetic reluctance
d) Magnetic inductance
Answer: c) Magnetic reluctance
29. The magnetic circuit is open when:
a) There is a gap in the magnetic path
b) The magnetic material is saturated
c) The magnetic field strength is zero
d) The magnetic permeability is infinite
Answer: a) There is a gap in the magnetic path
30. The magnetic flux in a magnetic circuit is proportional to:
a) Magnetic field strength
b) Magnetic permeability
c) Reluctance
d) Magnetomotive force
Answer: d) Magnetomotive force
Parallel magnetic circuit problems and solutions | Series magnetic circuit problems and solutions NEET
31. The magnetic circuit is analogous to which component in an electrical circuit?
a) Resistor
b) Capacitor
c) Inductor
d) Transformer
Answer: c) Inductor
32. The property of a material that determines its ability to conduct magnetic flux is called:
a) Magnetic permeability
b) Magnetic inductance
c) Magnetic reluctance
d) Magnetic field strength
Answer: a) Magnetic permeability
33. Which of the following factors affects the magnetic reluctance of a magnetic circuit?
a) Length of the magnetic path
b) Cross-sectional area of the magnetic path
c) Permeability of the material
d) All of the above
Answer: d) All of the above
34. The magnetic field strength inside a magnetic material depends on:
a) The magnetic permeability of the material
b) The length of the magnetic path
c) The voltage applied to the circuit
d) The resistance of the material
Answer: a) The magnetic permeability of the material
35. The total magnetomotive force (MMF) in a parallel magnetic circuit is:
a) The sum of the individual MMFs
b) The average of the individual MMFs
c) The product of the individual MMFs
d) None of the above
Answer: a) The sum of the individual MMFs
36. In a magnetic circuit, the magnetic field lines tend to follow the path of:
a) Least resistance
b) Greatest resistance
c) Least reluctance
d) Greatest reluctance
Answer: c) Least reluctance
37. The main purpose of a magnetic core in a magnetic circuit is to:
a) Increase the magnetic field strength
b) Decrease the magnetic flux
c) Provide a path for the magnetic flux
d) Generate an electromotive force
Answer: c) Provide a path for the magnetic flux
38. The magnetization curve of a magnetic material shows the relationship between:
a) Magnetic field strength and magnetic flux density
b) Magnetic permeability and magnetic reluctance
c) Magnetomotive force and magnetic flux
d) Magnetic field strength and magnetomotive force
Answer: a) Magnetic field strength and magnetic flux density
39. The concept of magnetic hysteresis refers to:
a) The loss of magnetic field strength over time
b) The dependence of magnetic flux on the magnetic field strength
c) The lagging of magnetic flux behind the magnetomotive force
d) The residual magnetism remaining in a material after the magnetizing force is removed
Answer: d) The residual magnetism remaining in a material after the magnetizing force is removed
40. The presence of air gaps in a magnetic circuit leads to:
a) Increased magnetic permeability
b) Increased magnetic field strength
c) Increased magnetic reluctance
d) Increased magnetic flux density
Answer: c) Increased magnetic reluctance
41. In a magnetic circuit, the total magnetic flux is determined by:
a) The magnetic field strength
b) The magnetic permeability
c) The magnetic reluctance
d) The magnetomotive force
Answer: d) The magnetomotive force
42. The permeability of a material is a measure of its:
a) Magnetic field strength
b) Ability to conduct magnetic flux
c) Magnetic reluctance
d) Magnetization curve
Answer: b) Ability to conduct magnetic flux
43. The concept of magnetic saturation refers to:
a) The loss of magnetic field strength over time
b) The dependence of magnetic flux on the magnetic field strength
c) The lagging of magnetic flux behind the magnetomotive force
d) The point at which the magnetic material cannot be magnetized further
Answer: d) The point at which the magnetic material cannot be magnetized further
44. The magnetic circuit analysis is based on which fundamental law?
a) Ohm’s law
b) Faraday’s law
c) Ampere’s law
d) Coulomb’s law
Answer: c) Ampere’s law
45. The unit of magnetomotive force (MMF) is:
a) Tesla
b) Ampere
c) Henry
d) Weber
Answer: b) Ampere
46. The reluctance of a magnetic circuit is directly proportional to:
a) Magnetic flux
b) Magnetic field strength
c) Magnetic permeability
d) Magnetomotive force
Answer: a) Magnetic flux
47. The magnetic field lines in a magnetic circuit tend to follow the path of:
a) Maximum magnetic field strength
b) Minimum magnetic field strength
c) Maximum magnetic permeability
d) Minimum magnetic permeability
Answer: c) Maximum magnetic permeability
48. The total magnetomotive force in a parallel magnetic circuit is equal to:
a) The sum of the individual magnetomotive forces
b) The average of the individual magnetomotive forces
c) The product of the individual magnetomotive forces
d) None of the above
Answer: b) The average of the individual magnetomotive forces
49. The concept of magnetic leakage refers to:
a) The loss of magnetic field strength over time
b) The dependence of magnetic flux on the magnetic field strength
c) The magnetic field lines that do not follow the desired path
d) The residual magnetism remaining in a material after the magnetizing force is removed
Answer: c) The magnetic field lines that do not follow the desired path
50. The magnetic reluctance of a magnetic circuit is inversely proportional to:
a) Magnetic field strength
b) Magnetic flux
c) Magnetic permeability
d) Magnetomotive force
Answer: c) Magnetic permeability
51. Which law states that the magnetic flux linking a closed loop is directly proportional to the current flowing through the loop?
a) Ohm’s law
b) Ampere’s law
c) Faraday’s law
d) Lenz’s law
Answer: b) Ampere’s law
52. The property of a material that opposes the formation of magnetic flux is known as:
a) Magnetic permeability
b) Magnetic reluctivity
c) Magnetic resistance
d) Magnetic inductance
Answer: c) Magnetic resistance
53. The unit of magnetic reluctivity is:
a) Tesla
b) Ampere
c) Henry
d) Permeability
Answer: d) Permeability
54. The magnetomotive force (MMF) in a magnetic circuit is analogous to which quantity in an electrical circuit?
a) Voltage
b) Current
c) Resistance
d) Power
Answer: a) Voltage
55. The reluctance of a magnetic circuit is determined by:
a) The magnetic field strength
b) The magnetic permeability
c) The length of the magnetic path
d) The cross-sectional area of the magnetic path
Answer: c) The length of the magnetic path
56. The magnetic circuit is closed when:
a) There is a gap in the magnetic path
b) The magnetic material is saturated
c) The magnetic field strength is zero
d) The magnetic permeability is infinite
Answer: d) The magnetic permeability is infinite
57. The energy stored in a magnetic circuit is given by:
a) 0.5 * H * B
b) 0.5 * B * H^2
c) 0.5 * B^2 * H
d) H * B
Answer: c) 0.5 * B^2 * H
58. The concept of magnetic coupling refers to:
a) The interaction between two magnetic circuits
b) The interaction between magnetic and electric fields
c) The interaction between magnetic and gravitational fields
d) The interaction between magnetic and thermal fields
Answer: a) The interaction between two magnetic circuits
59. The magnetic field strength (H) in a magnetic circuit is proportional to:
a) Magnetic flux
b) Magnetic permeability
c) Reluctance
d) Magnetomotive force
Answer: d) Magnetomotive force
60. The magnetic field lines in a magnetic circuit are:
a) Closed loops
b) Straight lines
c) Vary in shape
d) Absent
Answer: a) Closed loops
61. The magnetic circuit is analogous to which component in an electrical circuit?
a) Resistor
b) Capacitor
c) Inductor
d) Transformer
Answer: c) Inductor
62. The magnetic field strength in a magnetic circuit is determined by:
a) The current flowing through the circuit
b) The voltage applied to the circuit
c) The resistance of the circuit
d) The capacitance of the circuit
Answer: a) The current flowing through the circuit
63. The magnetic flux density is defined as:
a) The force experienced by a magnetic pole
b) The number of magnetic field lines passing through a surface per unit area
c) The product of magnetic field strength and magnetic permeability
d) The magnetomotive force per unit length
Answer: b) The number of magnetic field lines passing through a surface per unit area
64. In a series magnetic circuit, the total magnetic field strength is:
a) The sum of the individual field strengths
b) The average of the individual field strengths
c) The product of the individual field strengths
d) None of the above
Answer: a) The sum of the individual field strengths
65. The magnetic field intensity (H) inside a magnetic material is determined by:
a) The magnetic permeability of the material
b) The length of the magnetic path
c) The voltage applied to the circuit
d) The resistance of the material
Answer: a) The magnetic permeability of the material
66. The magnetic flux in a magnetic circuit is proportional to:
a) The magnetic field strength
b) The magnetic permeability
c) The reluctance
d) The magnetomotive force
Answer: d) The magnetomotive force
67. The concept of magnetic hysteresis refers to:
a) The loss of magnetic field strength over time
b) The dependence of magnetic flux on the magnetic field strength
c) The lagging of magnetic flux behind the magnetomotive force
d) The residual magnetism remaining in a material after the magnetizing force is removed
Answer: d) The residual magnetism remaining in a material after the magnetizing force is removed
68. The magnetic circuit is open when:
a) There is a gap in the magnetic path
b) The magnetic material is saturated
c) The magnetic field strength is zero
d) The magnetic permeability is infinite
Answer: a) There is a gap in the magnetic path
69. The main purpose of a magnetic core in a magnetic circuit is to:
a) Increase the magnetic field strength
b) Decrease the magnetic flux
c) Provide a path for the magnetic flux
d) Generate an electromotive force
Answer: c) Provide a path for the magnetic flux
70. The magnetization curve of a magnetic material shows the relationship between:
a) Magnetic field strength and magnetic flux density
b) Magnetic permeability and magnetic reluctance
c) Magnetomotive force and magnetic flux
d) Magnetic field strength and magnetomotive force
Answer: a) Magnetic field strength and magnetic flux density
71. The unit of magnetic flux is:
a) Tesla
b) Ampere
c) Henry
d) Weber
Answer: d) Weber
72. The magnetomotive force (MMF) is defined as:
a) The product of magnetic field strength and magnetic flux density
b) The number of magnetic field lines passing through a surface per unit area
c) The force experienced by a magnetic pole
d) The magnetic field strength times the length of the magnetic path
Answer: d) The magnetic field strength times the length of the magnetic path
73. The magnetic reluctance of a magnetic circuit is directly proportional to:
a) Magnetic field strength
b) Magnetic flux
c) Magnetic permeability
d) Magnetomotive force
Answer: b) Magnetic flux
74. The concept of magnetic saturation refers to:
a) The loss of magnetic field strength over time
b) The dependence of magnetic flux on the magnetic field strength
c) The lagging of magnetic flux behind the magnetomotive force
d) The point at which the magnetic material cannot be magnetized further
Answer: d) The point at which the magnetic material cannot be magnetized further
75. The magnetic field lines in a magnetic circuit tend to follow the path of:
a) Maximum magnetic field strength
b) Minimum magnetic field strength
c) Maximum magnetic permeability
d) Minimum magnetic permeability
Answer: c) Maximum magnetic permeability
76. The total magnetic flux in a series magnetic circuit is:
a) The sum of the individual fluxes
b) The average of the individual fluxes
c) The product of the individual fluxes
d) None of the above
Answer: a) The sum of the individual fluxes
77. The permeability of a material is a measure of its:
a) Magnetic field strength
b) Ability to conduct magnetic flux
c) Magnetic reluctance
d) Magnetization curve
Answer: b) Ability to conduct magnetic flux
78. The main purpose of magnetic shielding in a magnetic circuit is to:
a) Prevent leakage of magnetic flux
b) Increase the magnetic field strength
c) Decrease the magnetomotive force
d) Change the magnetic permeability of the material
Answer: a) Prevent leakage of magnetic flux
79. The energy stored in a magnetic circuit is given by:
a) 0.5 * H * B
b) 0.5 * B * H^2
c) 0.5 * B^2 * H
d) H * B
Answer: c) 0.5 * B^2 * H
80. The magnetic field intensity (H) in a magnetic circuit is proportional to:
a) Magnetic flux
b) Magnetic permeability
c) Reluctance
d) Magnetomotive force
Answer: d) Magnetomotive force