# Effective Aperture MCQ’s

This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Effective Aperture”.

1. 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

2. 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

3. Effective aperture is the ability of antenna to extract energy from the electromagnetic wave.
a) True
b) False

4. 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

5. 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

6. 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}

7. 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}}

8. What is the relation between effective length and Effective aperture of antenna?
d) A_e = \frac{dL^2 \eta ^2}{4R_{rad}}

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