MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
A 4-isotropic element end-fire array separated by a λ/4 distance has first null occurring at ____________ |
| A. | 60 |
| B. | 30 |
| C. | 90 |
| D. | 150 |
| Answer» D. 150 | |
| 2. |
The direction of the first minor lobe of 4 element isotropic broadside array separated by λ/2 is ___________ |
| A. | 41.4° |
| B. | 30° |
| C. | 60° |
| D. | 90° |
| Answer» B. 30° | |
| 3. |
The necessary condition for maximum of the second side lobe of n element array is __________ |
| A. | \( \frac{Nᴪ}{2}=±\frac{5π}{2}\) |
| B. | \( \frac{Nᴪ}{2}=±\frac{3π}{2}\) |
| C. | \( \frac{Nᴪ}{2}=±\frac{π}{2}\) |
| D. | \( \frac{Nᴪ}{2}=±\frac{4π}{2}\) |
| Answer» B. \( \frac{Nᴪ}{2}=±\frac{3π}{2}\) | |
| 4. |
What is the direction of first null of broadside 4-element isotropic antenna having a separation of λ/4? |
| A. | 0 |
| B. | 60 |
| C. | 30 |
| D. | 120 |
| Answer» B. 60 | |
| 5. |
What is the direction of first null of broadside 4-element isotropic antenna having a separation of λ/2? |
| A. | 60° |
| B. | 30° |
| C. | 180° |
| D. | 0° |
| Answer» B. 30° | |
| 6. |
The array factor of 4- isotropic elements of broadside array separated by a λ/2 is given by ____________ |
| A. | sinc(2cosθ) |
| B. | sin(2πcosθ) |
| C. | sinc(2πsinθ) |
| D. | sin(2sinθ) |
| Answer» B. sin(2πcosθ) | |
| 7. |
The array factor of 4- isotropic elements of broadside array separated by a λ/4 is given by ____________ |
| A. | sinc(cosθ) |
| B. | cos(sinθ) |
| C. | sin(sinθ) |
| D. | sin(cosθ) |
| Answer» B. cos(sinθ) | |
| 8. |
A 4-isotropic element broadside array separated by a λ/4 distance has nulls occurring at ____________ |
| A. | cos-1 (±n) |
| B. | \(cos^{-1} (±\frac{n}{2})\) |
| C. | \(sin^{-1} (±\frac{n}{2})\) |
| D. | sin-1 (±n) |
| Answer» B. \(cos^{-1} (±\frac{n}{2})\) | |
| 9. |
A 4-isotropic element broadside array separated by a λ/2 distance has nulls occurring at ____________ |
| A. | \(cos^{-1} (±\frac{n}{2}) \) |
| B. | \(cos^{-1} (±\frac{4n}{2}) \) |
| C. | \(sin^{-1} (±\frac{n}{2}) \) |
| D. | \(sin^{-1} (±\frac{n}{4}) \) |
| Answer» B. \(cos^{-1} (±\frac{4n}{2}) \) | |
| 10. |
The array factor of 4- isotropic elements of broadside array is given by ____________ |
| A. | \(\frac{sin(2kdcosθ)}{2kdcosθ} \) |
| B. | \(\frac{sin(kdcosθ)}{2kdcosθ} \) |
| C. | \(\frac{sin(2kdcosθ)}{kdcosθ} \) |
| D. | \(\frac{cos(2kdcosθ)}{2kdcosθ} \) |
| Answer» B. \(\frac{sin(kdcosθ)}{2kdcosθ} \) | |