MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 magnetic field of the solenoid is 18.84mT, the current is 30A. Calculate the number of turns per unit length if the core is air. |
| A. | 1500 turns/m |
| B. | 1000 turns/m |
| C. | 500 turns /m |
| D. | 2000 turns/m |
| Answer» D. 2000 turns/m | |
| 2. |
What happens to the magnetic field in the solenoid when the current increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 3. |
The magnetic field of the solenoid is 18.84mT, the current is 30A. Calculate the number of turns per unit length if the core is air? |
| A. | 1500 turns/m |
| B. | 1000 turns/m |
| C. | 500 turns /m |
| D. | 2000 turns/m |
| Answer» D. 2000 turns/m | |
| 4. |
The magnetic field of the solenoid is 18.84mT, the number of turns per unit length is 500 turns per metre. Calculate the current if the core is air. |
| A. | 300A |
| B. | 30A |
| C. | 3A |
| D. | 300mA |
| Answer» C. 3A | |
| 5. |
The current in a solenoid is 30A, the number of turns per unit length is 500 turns per metre. Calculate the magnetic field if the core is air. |
| A. | 18.84T |
| B. | 18.84mT |
| C. | 1.84T |
| D. | 1.84mT |
| Answer» C. 1.84T | |
| 6. |
What happens to the magnetic field in the solenoid when the length of the solenoid increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» C. Remains constant | |
| 7. |
What happens to the magnetic field in the solenoid when the number of turns increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 8. |
What is the formula for the magnetic field due to a solenoid? |
| A. | μnI |
| B. | μn<sup>2</sup> |
| C. | μNI |
| D. | μN<sup>2</sup>I<sup>2</sup> |
| Answer» B. ‚âà√≠¬¨‚à´n<sup>2</sup> | |
| 9. |
If a coil is wound around a steel core and electric current is passed through the coil, the steel core acts as a? |
| A. | Electromagnet |
| B. | Permanent magnet |
| C. | Neither electromagnet nor permanent magnet |
| D. | Either electromagnet or permanent magnet |
| Answer» C. Neither electromagnet nor permanent magnet | |
| 10. |
The magnetic field strength of a solenoid can be increased by inserting which of the following materials as the core? |
| A. | Copper |
| B. | Silver |
| C. | Iron |
| D. | Aluminium |
| Answer» D. Aluminium | |