Wireless and Mobile Communications Practice Test 3

1. The mechanism behind electromagnetic wave propagation cannot be attributed to ___________

Scattering

Sectoring

Reflection

Diffraction

2. The actual received signal is ______ than what is predicted by reflection and diffraction model.

Very weak

Stronger

Equal

Weaker

3. Difference between the direct path and the diffracted path is called _______

Radio path length

Average length

Wavelength

Excess path length

4. Partitions that can be moved are called _______

Dynamic partition

Hard partitions

Soft partitions

Disk partition

5. The propagation model that estimates radio coverage of a transmitter is called ___________

Okumura model

Large scale propagation model

Fading model

Small scale propagation model

6. Antenna’s efficiency is given by the ratio of __________

Signal power to noise power

Effective aperture to physical aperture

Physical aperture to effective aperture

Losses

7. Scattered waves are produced at ________

Shadowed region

Horizon

Rough surface

Smooth surface

8. RCS of scattering object is defined as the ratio of _______

Power density of incident waves to power density of reflected wave

Power density of reflected wave to power density of incident waves

Power density of radio wave incident to power density of signal scattered

Power density of signal scattered to power density of radio wave incident

9. Which principle explains the phenomenon of diffraction?

Pascal’s Principle

Huygen’s principle

Archimedes’ Principle

Principle of Simultaneity

10. The variability of the environment is slower for a smaller range of T-R separation distances in indoor models.

False

True