MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 false regarding a linear broadside array with 2 elements and spacing λ? |
| A. | Directivity = 6.02 dB |
| B. | No grating lobes are present |
| C. | Nulls occur at \(cos^{-1}\frac{1}{2} \) |
| D. | The maxima occurs normal to the axis of array and also at other angles |
| Answer» C. Nulls occur at \(cos^{-1}\frac{1}{2} \) | |
| 2. |
The directivity of a linear broadside array with half wave length spacing is equal to _____ |
| A. | Unity |
| B. | Zero |
| C. | Half of the number of elements present in array |
| D. | Number of elements present in array |
| Answer» E. | |
| 3. |
In a broadside array all the elements must have equal ______ excitation with similar amplitude excitations to get maximum radiation. |
| A. | Phase |
| B. | Frequency |
| C. | Voltage |
| D. | Current |
| Answer» B. Frequency | |
| 4. |
What would be the directivity of a linear broadside array in dB consisting 5 isotropic elements with element spacing λ/4? |
| A. | 9.37 |
| B. | 3.97 |
| C. | 6.53 |
| D. | 3.79 |
| Answer» C. 6.53 | |
| 5. |
Find the value θn at which null occurs for an 8-element broadside array with spacing d. |
| A. | \(cos^{-1}\frac{λn}{Nd}\) |
| B. | \(sin^{-1}\frac{λn}{Nd}\) |
| C. | \(cos^{-1}\frac{2λn}{Nd}\) |
| D. | \(sin^{-1}\frac{2λn}{Nd}\) |
| Answer» B. \(sin^{-1}\frac{λn}{Nd}\) | |
| 6. |
Which of the following cannot be the separation between elements in a broadside array to avoid grating lobes? |
| A. | 4λ/2 |
| B. | λ/2 |
| C. | 3λ/2 |
| D. | 5λ/2 |
| Answer» B. λ/2 | |
| 7. |
Which of the following statements is false regarding a broadside array? |
| A. | The maximum radiation is normal to the axis of the array |
| B. | Must have same amplitude excitation but different phase excitation among different elements |
| C. | The spacing between elements must not equal to the integral multiples of λ |
| D. | The phase excitation difference must be equal to zero |
| Answer» C. The spacing between elements must not equal to the integral multiples of λ | |
| 8. |
What is the phase excitation difference for a broadside array? |
| A. | 0 |
| B. | π/2 |
| C. | π |
| D. | 3π/2 |
| Answer» B. π/2 | |
| 9. |
In Broadside array the maximum radiation is directed with respected to the array axis at an angle____ |
| A. | 90° |
| B. | 45° |
| C. | 0° |
| D. | 180° |
| Answer» B. 45° | |