WorksheetsMOBILE COMMUNICATION UNIT 1
Total questions: 40
Worksheet time: 23mins
In the two ray model, if the power of the transmitter increases, the received power will
Increase
Decrease
Stay the same
become zero
Diffraction occurs when the wave hits the __________ surfaces
sharp edge
rough
flat
smooth
When a signal hits the sharp edge of a hill which of the following occurs?
Reflection
Diffraction
Scattering
Refraction
Scattering happens when a wave encounters:
A large wall
A small object or rough surface
Open space
High voltage
In the free space model, the received power decreases with the square of
Frequency
Transmit power
Distance
Antenna height
Small scale fading is caused by ______________
Drag shift
Doppler shift
Vertical shift
Horizontal shift
Which phenomenon occurs when a radio wave hits objects much smaller than its wavelength?
Reflection
Diffraction
Absorption
Scattering
Which of the following occurs when the wave hits the objects with rough surface?
Reflection
Diffraction
Scattering
Refraction
In the free space model, if the distance between transmitter and receiver increases, the received power will
Increase
Decrease
Stay the same
become zero
Small-scale fading happens _____________
Over long distances
When changing phone settings
Over short distances and short times
When antenna is turned off
Large-scale path loss depends mainly on:
Antenna color
Battery percentage
Distance and obstacles
Which phenomenon helps radio waves reach non-line-of-sight areas?
Reflection
Diffraction
Absorption
Refraction
In Two-Ray model, the reflected wave comes from:
The sky
The transmitter
The ground
Trees
Which of the following is large-scale path loss?
Signal gets weaker quickly over short distances
Signal gets weaker slowly over long distances
Signal is blocked by one object only
Signal becomes stronger when moving
Diffraction allows radio waves to:
Penetrate through metal
Travel only in a straight line
Bend around obstacles
Get completely absorbed
The Two-Ray Model is more accurate than FSPL at:
Very short ranges
High altitudes
Long distances
No range
The free space propagation model assumes
Multipath fading
Line of sight between transmitter and receiver
Which one causes rapid fluctuation in signal strength?
Large-scale fading
Small-scale fading
Free space loss
Path reflection
Which of the following is a type of small-scale fading?
Reflection loss
Refraction loss
Fast fading
Attenuation
In the two ray model, if the distance between transmitter and receiver increases, the received power will:
Increase
Decrease
Stay the same
become zero
Reflection occurs when a wave hits a surface that is:
Smooth and large compared to wavelength
Smaller than the wavelength
Transparent
Moving
The Free Space Propagation Model assumes:
Multipath environment
No obstacles
Underground cable
Urban setup
Small-scale fading is caused by:
Distance alone
Atmospheric pressure
Multipath propagation
Power failure
Two-ray model considers:
Only direct path
Reflected and diffracted paths
Direct and reflected path
Multiple scattered paths
In FSPL, received power decreases:
Linearly
Logarithmically
Not at all
Irregularly
Which of the following is NOT a radio wave propagation mechanism?
Reflection
Refraction
Rotation
Diffraction
When a signal is spread in multiple directions from a rough surface, it describes ____________
Diffraction
Reflection
Scattering
Refraction
Which of the following is the rapid fluctuation of a radio signal's amplitude and phase over short distances?
Shadowing
Path loss
Free space propagation
Small-scale fading
Which phenomenon occurs when a radio wave hits objects much larger than its wavelength?
Reflection
Diffraction
Scattering
Absorption
Large-scale path loss depends mainly on:
Reflection and refraction
Distance and environment
Scattering
Transmitter power only
Which formula is used in the Free Space Path Loss model?
Friis transmission formula
Ohm's law
Snell's law
Kirchhoff's law
Which factor has the biggest effect on large-scale path loss?
Device temperature
Weather condition
Distance between transmitter and receiver
Length of antenna cable
Which of the following occurs when the wave hits the objects with smooth surface?
diffraction
refraction
Path loss in free space increases with:
Decreasing frequency
Increasing antenna height
Increasing distance
Decreasing distance
Which factor affects path loss in the Two-Ray Model?
Antenna height
Frequency only
Noise figure
Impedance
The two-ray model includes ________________
Direct line-of-sight path only
Ground reflection and direct line-of-sight path
Scattering only
Absorption only
What does FSPL stand for?
Full Signal Power Line
Free Signal Phase Loss
Free Space Path Loss
Forward Signal Processing Logic
Large-scale path loss increases with:
Lower frequency
Shorter distance
Higher distance
Higher SNR
In Two-Ray Model, interference occurs between:
Which of the following is related to direct and reflected waves?
Frequency and wavelength
Transmitter and antenna
Direct and reflected waves
Path loss and shadowing
