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. |
If the aperture antenna is tapered only in H-plane then which of the following is true compared to uniform non-tapered aperture antenna? |
| A. | Principle patterns in E-plane and H-plane are same in both cases |
| B. | Principle patterns in E-plane and H-plane are different in both cases |
| C. | Principle patterns in E-plane is same and H-plane is different |
| D. | Principle patterns in E-plane is different and H-plane is same |
| Answer» D. Principle patterns in E-plane is different and H-plane is same | |
| 2. |
Tapering is done in order to reduce the side lobe level. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
The principle plane pattern of the E-plane of rectangular aperture of a b is given by F( ) = ______ |
| A. | ( frac{sin u2061(0.5kbsin theta)}{0.5kbsin theta} ) |
| B. | ( frac{cos u2061(0.5kbcos theta)}{0.5kbsin theta} ) |
| C. | ( frac{sec u2061(0.5kbsin theta)}{0.5kbsin theta} ) |
| D. | ( frac{1-sin u2061(0.5kbsin theta)}{0.5kbsin theta} ) |
| Answer» B. ( frac{cos u2061(0.5kbcos theta)}{0.5kbsin theta} ) | |
| 4. |
Which of the following is used to reduce side lobe levels in aperture antenna? |
| A. | Tapering |
| B. | Increasing the power |
| C. | Using repeaters |
| D. | Reducing power |
| Answer» B. Increasing the power | |
| 5. |
The relation between directivity and the effective aperture of the uniform aperture antenna is given by _____ |
| A. | (D = frac{4 pi}{ lambda^2}A_{eff} ) |
| B. | (A_{eff} = frac{4 pi}{ lambda^2}D ) |
| C. | (A_{eff} = frac{4 pi lambda^2}{D} ) |
| D. | (D = frac{4 pi lambda^2}{A_{eff}} ) |
| Answer» B. (A_{eff} = frac{4 pi}{ lambda^2}D ) | |
| 6. |
A rectangular aperture a b is placed in xy-plane, The HPBW in H-plane is given by _____ |
| A. | 0.886 /a |
| B. | 0.443 /a |
| C. | 0.5 /b |
| D. | /b |
| Answer» B. 0.443 /a | |
| 7. |
The first-level of the side lobe occurs at ______ dB for a uniform rectangular aperture antenna. |
| A. | -13.26 |
| B. | -6.63 |
| C. | 3 |
| D. | 8.5 |
| Answer» B. -6.63 | |
| 8. |
The total pattern function for rectangular aperture f(x, y) if f(x) and f(y) are separable is given by ____ |
| A. | f(x, y)=f(x) f(y) |
| B. | f(x, y)=f(x)+f(y) |
| C. | f(x, y)=f(x)/f(y) |
| D. | f(x, y)=f(x)-f(y) |
| Answer» B. f(x, y)=f(x)+f(y) | |
| 9. |
The radiation pattern of rectangular is similar to line source integrated in two directions |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Which of the following antenna belongs to rectangular aperture? |
| A. | Horn antenna |
| B. | Helical antenna |
| C. | Parabolic antenna |
| D. | Conical antenna |
| Answer» B. Helical antenna | |