MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Antenna Array knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is the correct condition of an ordinary end-fire array? |
| A. | β=±kd |
| B. | β=kd |
| C. | β > kd |
| D. | β < ±kd |
| Answer» B. β=kd | |
| 2. |
Find the overall length of an end-fire array with 10 elements and spacing λ/4. |
| A. | \(\frac{9λ}{4}\) |
| B. | \(\frac{5λ}{4}\) |
| C. | \(\frac{5λ}{2}\) |
| D. | \(\frac{9λ}{2}\) |
| Answer» B. \(\frac{5λ}{4}\) | |
| 3. |
What is the progressive phase excitation of an end-fire array with element spacing λ/4 at θ=180°? |
| A. | \(\frac{π}{2}\) |
| B. | \(-\frac{π}{2}\) |
| C. | π |
| D. | \(\frac{π}{4}\) |
| Answer» B. \(-\frac{π}{2}\) | |
| 4. |
Which of the following statements is true regarding end-fire array? |
| A. | The necessary condition of an ordinary end-fire array is β=±kd+nπ |
| B. | The phase excitation difference is zero |
| C. | Same input current is fed through the array, but the phase excitation is varies progressively |
| D. | Maximum radiation occurs at normal to the axis of array |
| Answer» D. Maximum radiation occurs at normal to the axis of array | |
| 5. |
What is the phase excitation difference in end-fire array with array spacing d at θ=0°? |
| A. | \(-\frac{2π}{λ} d \) |
| B. | \(\frac{2π}{λ} d \) |
| C. | \(-\frac{π}{λ} d \) |
| D. | \(\frac{π}{λ} d \) |
| Answer» B. \(\frac{2π}{λ} d \) | |
| 6. |
The phase excitation difference is zero in end-fire array. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
What is the phase excitation difference for an end-fire array? |
| A. | 0 |
| B. | ±kd /2 |
| C. | π |
| D. | ±kd |
| Answer» E. | |
| 8. |
The direction of maximum radiation in end-fire array is ______ with respect to the array axis. |
| A. | 0° or 180° |
| B. | 90° |
| C. | 45° |
| D. | 270° |
| Answer» B. 90° | |