# Free Space Propagation Model – Multiple Choice Questions and Answers (MCQs)

Set of MCQs (Multiple Choice Questions & Answers) with Answers on Free Space Propagation Model of Wireless & Mobile Communications in ECE (Electronics & Communication Eng.).

1. The mechanism behind electromagnetic wave propagation cannot be attributed to ___________
a) Reflection
b) Diffraction
c) Scattering
d) Sectoring

2. The propagation model that estimates radio coverage of a transmitter is called ___________
a) Large scale propagation model
b) Small scale propagation model
d) Okumura model

3. Propagation model that characterize rapid fluctuation is called _________
a) Hata model
c) Large scale propagation model
d) Okumura model

4. Small scale propagation model is also known as _________
b) Micro scale propagation model
c) Okumura model
d) Hata model

5. Free space propagation model is to predict ______
b) Transmitted power
c) Gain of transmitter

6. Which of the following do not undergo free space propagation?
a) Satellite communication system
d) Wired telephone systems

7. The free space model predicts that received signal decays as a function of _________
a) Gain of transmitter antenna
b) T-R separation
c) Power of transmitter antenna
d) Effective aperture of the antenna

8. Relation between gain and effective aperture is given by ______
a) G=(4πAe)/λ2
b) G=(4π λ2)/Ae
c) G=4πAe
d) G=Ae2

9. Relation between wavelength and carrier frequency is _________
a) λ=c/f
b) λ=c*f
c) λ=f/c
d) λ=1/f

10. Which of the following antenna radiates power with unit gain uniformly in all directions?
a) Directional antenna
b) Dipole antenna
c) Isotropic antenna
d) Loop antenna

11. EIRP is abbreviated as __________
c) Effective and immediate radiated power
d) Effective and immediate ratio of power

12. Path loss in free space model is defined as difference of ________
a) Effective transmitted power and gain
b) Effective received power and distance between T-R
d) Effective transmitter power and receiver power

13. Far field region is also known as _________
a) Near field region
b) Fraunhofer region
c) Erlang region
d) Fresnel region

14. Fraunhofer distance is given by _____
a) 2D2/λ
b) 2D/λ
c) D/λ
d) 2D/λ2

15. Which of the following is called an ideal antenna?
a) Dipole antenna
b) Directional antenna
c) Isotropic antenna
d) Loop antenna