MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The equivalent of the current I in magnetic ohm’s law is? |
| A. | Flux |
| B. | Reluctance |
| C. | MMF |
| D. | Resistance |
| Answer» B. Reluctance | |
| 2. |
What is MMF? |
| A. | Magnetic Machine Force |
| B. | Magnetomotive Force |
| C. | Magnetic Motion Force |
| D. | Magnetomotion Force |
| Answer» C. Magnetic Motion Force | |
| 3. |
Can we apply Kirchhoff’s law to magnetic circuits? |
| A. | Yes |
| B. | No |
| C. | Depends on the circuit |
| D. | Insufficient information provided |
| Answer» B. No | |
| 4. |
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. Relative permeability of ring is 380. Calculate the magnetising current. |
| A. | 6.7A |
| B. | 7.7A |
| C. | 7.6 |
| D. | 6.1A |
| Answer» B. 7.7A | |
| 5. |
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. Relative permeability of ring is 380. Calculate the magnetomotive force. |
| A. | 1442At |
| B. | 1342At |
| C. | 1432At |
| D. | 1344At |
| Answer» E. | |
| 6. |
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. Relative permeability of ring is 380. Calculate the reluctance. |
| A. | 1.68 * 10-4A/Wb |
| B. | 1.68 * 104 A/Wb |
| C. | 1.68 * 106 A/Wb |
| D. | 1.68 * 10-6A/Wb |
| Answer» D. 1.68 * 10-6A/Wb | |
| 7. |
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. |
| A. | 1.6T |
| B. | 2.6T |
| C. | 3.6T |
| D. | 4.6T |
| Answer» B. 2.6T | |
| 8. |
Ohm’s law for magnetic circuits is _________ |
| A. | F=ϕS |
| B. | F=ϕ/S |
| C. | F=ϕ2S |
| D. | F=ϕ/S2 |
| Answer» B. F=ϕ/S | |
| 9. |
WHAT_IS_MMF??$ |
| A. | Magnetic Machine Force |
| B. | Magnetomotive Force |
| C. | Magnetic Motion Force |
| D. | Magnetomotion Force |
| Answer» C. Magnetic Motion Force | |
| 10. |
The_equivalent_of_the_current_I_in_magnetic_ohm’s_law_is?$# |
| A. | Flux |
| B. | Reluctance |
| C. | MMF |
| D. | Resistance |
| Answer» B. Reluctance | |
| 11. |
Can we apply Kirchhoff’s was to magnetic circuits?# |
| A. | Yes |
| B. | No |
| C. | Depends on the circuit |
| D. | Insufficient information provided |
| Answer» B. No | |
| 12. |
A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetising current.# |
| A. | 6.7A |
| B. | 7.7A |
| C. | 7.6 |
| D. | 6.1A |
| Answer» B. 7.7A | |
| 13. |
A ring having a cross-sectional area of 500 mm2, a circumference of and ϕ=800microWb 400 mm has a coil of 200 turns wound around it. Calculate the reluctance.$ |
| A. | 1.68 * 10<sup>-4</sup>A/Wb |
| B. | 1.68 * 10<sup>4</sup> A/Wb |
| C. | 1.68 * 10<sup>6</sup> A/Wb |
| D. | 1.68 * 10<sup>-6</sup>A/Wb |
| Answer» D. 1.68 * 10<sup>-6</sup>A/Wb | |
| 14. |
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.$ |
| A. | 1.6T |
| B. | 2.6T |
| C. | 3.6T |
| D. | 4.6T |
| Answer» B. 2.6T | |
| 15. |
Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb. |
| A. | 10At |
| B. | 10N |
| C. | 15N |
| D. | 15At |
| Answer» E. | |
| 16. |
What happens to the MMF when the magnetic flux decreases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» C. Remains constant | |
| 17. |
Ohm’s law for magnetic circuits is _________ |
| A. | F=ϕS |
| B. | F=ϕ/S |
| C. | F=ϕ<sup>2</sup>S |
| D. | F=ϕ/S<sup>2</sup> |
| Answer» B. F=‚âà√¨‚àö√ò/S | |