MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Antennas knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following type does helical antenna belongs to? |
| A. | Wire type |
| B. | Aperture |
| C. | Reflector |
| D. | Array |
| Answer» B. Aperture | |
| 2. |
Find the number of turns in the helical antenna with directivity 120 and C =1 and pitch angle 6 . |
| A. | 100 |
| B. | 50 |
| C. | 120 |
| D. | 12 |
| Answer» B. 50 | |
| 3. |
The Axial ratio of the helical antenna with 3 turns is _____ |
| A. | 1.11 |
| B. | 0.89 |
| C. | 6 |
| D. | 0.98 |
| Answer» B. 0.89 | |
| 4. |
What is the total axial length of the helical antenna with 5 turns and circumference per wavelength is 1.2 and separation between turns is 2 cm? |
| A. | 10cm |
| B. | 20cm |
| C. | 6cm |
| D. | 12cm |
| Answer» B. 20cm | |
| 5. |
What is the Input impedance of the axial feed helical antenna with circumference per unit wavelength is 1.2? |
| A. | 168 |
| B. | 186 |
| C. | 198 |
| D. | 158 |
| Answer» B. 186 | |
| 6. |
What is the pitch angle of the helical antenna to become a linear antenna? |
| A. | 90 |
| B. | 0 |
| C. | 45 |
| D. | 60 |
| Answer» B. 0 | |
| 7. |
What is the necessary condition for a helical antenna to operate in the axial mode? |
| A. | D << |
| B. | D |
| C. | D n |
| D. | D=0 |
| Answer» C. D n | |
| 8. |
What is the pitch angle if the separation of turns is at 2 cm and the circumference is of 4 cm? |
| A. | 26.56 |
| B. | 62.65 |
| C. | 30 |
| D. | 25.34 |
| Answer» B. 62.65 | |
| 9. |
What is the pitch angle of the helical antenna to become a loop antenna? |
| A. | 90 |
| B. | 0 |
| C. | 45 |
| D. | 60 |
| Answer» C. 45 | |
| 10. |
Which of the following modes does the condition D << is satisfied in helical antenna? |
| A. | Axial mode |
| B. | Normal mode |
| C. | Conical mode |
| D. | Axial, Normal and Conical |
| Answer» C. Conical mode | |