MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Antenna Parameters knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The physical aperture of an isotropic radiator is _______ |
| A. | ( frac{4 pi eta}{ lambda^2} ) |
| B. | ( frac{4 pi}{ lambda^2 eta} ) |
| C. | ( frac{ lambda^2}{4 pi eta} ) |
| D. | ( frac{ lambda^2 eta}{4 pi} ) |
| Answer» D. ( frac{ lambda^2 eta}{4 pi} ) | |
| 2. |
What is the relation between effective length and Effective aperture of antenna? |
| A. | (A_e = frac{dL^2 eta}{4R_{rad}} ) |
| B. | (A_e = frac{dL^2}{4 eta R_{rad}} ) |
| C. | (A_e = frac{dL^2 R_{rad}}{4 eta} ) |
| D. | (A_e = frac{dL^2 eta ^2}{4R_{rad}} ) |
| Answer» B. (A_e = frac{dL^2}{4 eta R_{rad}} ) | |
| 3. |
What is the effective aperture of a Half-wave dipole operating at 100MHz? |
| A. | 1.07m<sup>2</sup> |
| B. | 1.17m<sup>2</sup> |
| C. | 1.27m<sup>2</sup> |
| D. | 1.77m<sup>2</sup> |
| Answer» C. 1.27m<sup>2</sup> | |
| 4. |
Expression for aperture efficiency in terms of physical aperture Ae and effective aperture Aem is ____ |
| A. | ( frac{A_e}{A_{em}} ) |
| B. | ( frac{A_{em}}{A_e} ) |
| C. | ( frac{A_e+A_{em}}{A_e-A_{em}} ) |
| D. | ( frac{A_e-A_{em}}{A_e+A_{em}} ) |
| Answer» C. ( frac{A_e+A_{em}}{A_e-A_{em}} ) | |
| 5. |
If physical aperture of antenna is 0.02m2 and aperture efficiency is 0.5, then what is the value of effective aperture? |
| A. | 0.0004m<sup>2</sup> |
| B. | 0.001m<sup>2</sup> |
| C. | 0.01m<sup>2</sup> |
| D. | 25m<sup>2</sup> |
| Answer» D. 25m<sup>2</sup> | |
| 6. |
What is the effective aperture of Hertzian dipole antenna operating at frequency 100 MHz? |
| A. | 1.07m<sup>2</sup> |
| B. | 0.17m<sup>2</sup> |
| C. | 1.7m<sup>2</sup> |
| D. | 1.2m<sup>2</sup> |
| Answer» B. 0.17m<sup>2</sup> | |
| 7. |
Which of the following best describes the condition for Maximum effective aperture? |
| A. | Load impedance must be equal to the antenna impedance |
| B. | Load impedance must be equal complex conjugate to the antenna impedance |
| C. | Receiver power should be minimum |
| D. | Transmitter power should be minimum |
| Answer» C. Receiver power should be minimum | |
| 8. |
Effective aperture is the ability of antenna to extract energy from the electromagnetic wave. |
| A. | True |
| B. | False |
| Answer» B. False | |