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. | 1.07m2 |
| B. | 1.17m2 |
| C. | 1.27m2 |
| D. | 1.77m2 |
| Answer» C. 1.27m2 | |
| 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. | 0.0004m2 |
| B. | 0.001m2 |
| C. | 0.01m2 |
| D. | 25m2 |
| Answer» D. 25m2 | |
| 6. |
What is the effective aperture of Hertzian dipole antenna operating at frequency 100 MHz? |
| A. | 1.07m2 |
| B. | 0.17m2 |
| C. | 1.7m2 |
| D. | 1.2m2 |
| Answer» B. 0.17m2 | |
| 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 | |