MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Electromagnetic Theory knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How many classifications of magnetic materials are present? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 2. |
What is the unit of reluctance in magnetic materials? |
| A. | Henry/m |
| B. | Weber/m2 |
| C. | Ampere-turns/Weber |
| D. | Ampere-turns/m |
| Answer» D. Ampere-turns/m | |
| 3. |
High Reluctance affects the performance of magnetic materials. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
What is reluctance in magnetic materials? |
| A. | Allows the buildup of magnetic flux |
| B. | Reduces the buildup of magnetic flux |
| C. | Resists the buildup of magnetic flux |
| D. | Increases the buildup of magnetic flux |
| Answer» D. Increases the buildup of magnetic flux | |
| 5. |
What is the property of retentivity in magnetic materials? |
| A. | After removal of external magnetic fields, magnetization exists |
| B. | After removal of external magnetic fields, magnetization doesn’t exist |
| C. | After removal of internal magnetic fields, magnetization exists |
| D. | After removal of internal magnetic fields, magnetization doesn’t exist |
| Answer» B. After removal of external magnetic fields, magnetization doesn’t exist | |
| 6. |
What is the property of magnetic materials? |
| A. | Resistivity |
| B. | Conductivity |
| C. | Permeability |
| D. | Ductility |
| Answer» D. Ductility | |
| 7. |
In ferromagnetic materials the susceptibility is infinity. State True/False |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
The susceptibility is independent of temperature in which material? |
| A. | Paramagnetic |
| B. | Ferromagnetic |
| C. | Diamagnetic |
| D. | Ferromagnetic |
| Answer» D. Ferromagnetic | |
| 9. |
Find the susceptibility when the curie constant is 0.2 and the difference in critical temperature and paramagnetic curie temperature is 0.01. |
| A. | 2 |
| B. | 20 |
| C. | 0.02 |
| D. | 200 |
| Answer» C. 0.02 | |
| 10. |
WHAT_IS_RELUCTANCE_IN_MAGNETIC_MATERIALS??$ |
| A. | Allows the buildup of magnetic flux |
| B. | Reduces the buildup of magnetic flux |
| C. | Resists the buildup of magnetic flux |
| D. | Increases the buildup of magnetic flux |
| Answer» D. Increases the buildup of magnetic flux | |
| 11. |
THE_SUSCEPTIBILITY_IS_INDEPENDENT_OF_TEMPERATURE_IN_WHICH_MATERIAL??$ |
| A. | Paramagnetic |
| B. | Ferromagnetic |
| C. | Diamagnetic |
| D. | Ferromagnetic |
| Answer» D. Ferromagnetic | |
| 12. |
What is the unit of reluctance in magnetic materials?$ |
| A. | Henry/m |
| B. | Weber/m<sup>2</sup> |
| C. | Ampere-turns/Weber |
| D. | Ampere-turns/m |
| Answer» D. Ampere-turns/m | |
| 13. |
High_Reluctance_affects_the_performance_of_magnetic_materials.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
In_ferromagnetic_materials_the_susceptibility_is_infinity._State_True/False$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
What is the example of ferromagnetic materials is? |
| A. | Magnetite |
| B. | Hematite |
| C. | Nickel |
| D. | Biotite |
| Answer» B. Hematite | |
| 16. |
What is the example of diamagnetic materials? |
| A. | Quartz |
| B. | Pyrite |
| C. | Montmorillonite |
| D. | Biotite |
| Answer» B. Pyrite | |
| 17. |
What is the property of ferromagnetic materials? |
| A. | Negative magnetization |
| B. | Magnetization slightly less than 1 |
| C. | Magnetization slightly greater than 1 |
| D. | Magnetization very much higher than 1 |
| Answer» E. | |
| 18. |
How many classification of magnetic materials are present? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 19. |
What are magnetic hard materials? |
| A. | High retentivity, low coercivity |
| B. | High retentivity, high coercivity |
| C. | Low retentivity, low coercivity |
| D. | Low retentivity, high coercivity |
| Answer» C. Low retentivity, low coercivity | |
| 20. |
Find the susceptibility when the curie constant is 0.2 and the difference in critical temperature and paramagnetic curie temperature is 0.01? |
| A. | 2 |
| B. | 20 |
| C. | 0.02 |
| D. | 200 |
| Answer» C. 0.02 | |
| 21. |
What is coercivity force in magnetic materials? |
| A. | The force required to add upon the existing magnetization |
| B. | The force required to remove the existing magnetization |
| C. | The force required to produce magnetic flux |
| D. | The force required to break magnetic flux |
| Answer» C. The force required to produce magnetic flux | |
| 22. |
The materials having very small susceptibility at all temperatures are |
| A. | Antiferromagnetic |
| B. | Diamagnetic |
| C. | Ferromagnetic |
| D. | Paramagnetic |
| Answer» B. Diamagnetic | |
| 23. |
The converse of magnetostriction is called the |
| A. | Magnetization |
| B. | Magnetic anisotropy |
| C. | Villari effect |
| D. | Curie effect |
| Answer» D. Curie effect | |
| 24. |
Is retentivity associated with B-H curve? |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 25. |
Piezoelectric effect is analogous to which phenomenon? |
| A. | Electrostriction |
| B. | Magnetostriction |
| C. | Anisotropy |
| D. | Magnetization |
| Answer» C. Anisotropy | |
| 26. |
How should the permeability and number of ampere turns for good magnetic materials be? |
| A. | high permeability, high ampere turns |
| B. | high permeability, low ampere turns |
| C. | low permeability, low ampere turns |
| D. | low permeability, high ampere turns |
| Answer» C. low permeability, low ampere turns | |
| 27. |
In which materials the magnetic anisotropy is followed? |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Ferromagnetic |
| Answer» D. Ferromagnetic | |
| 28. |
What is the representation of permeability? |
| A. | coercivity/retentivity |
| B. | flux/flux density |
| C. | magnetic force/magnetic flux density |
| D. | magnetic flux density/magnetic force |
| Answer» E. | |
| 29. |
Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units. |
| A. | 86 |
| B. | 62 |
| C. | 752 |
| D. | 19.4 |
| Answer» E. | |
| 30. |
What is the property of permeability in magnetic materials? |
| A. | how easily the magnetic flux is broken/clear |
| B. | how easily the magnetic flux is set up |
| C. | how long the magnetic flux takes to form |
| D. | how long the magnetic flux takes to clear |
| Answer» C. how long the magnetic flux takes to form | |
| 31. |
The magnetic materials follow which law? |
| A. | Faraday’s law |
| B. | Ampere law |
| C. | Lenz law |
| D. | Curie Weiss law |
| Answer» E. | |
| 32. |
The presence of parallel alignment of magnetic dipole moment is given by which materials? |
| A. | Diamagnetic |
| B. | Ferromagnetic |
| C. | Paramagnetic |
| D. | Ferromagnetic |
| Answer» C. Paramagnetic | |