NEW
Font size
WorksheetsWC unit 2 Review Quiz
Total questions: 40
Worksheet time: 20mins
In free space transmission, the signal attenuation increases
proportional with distance
proportional with the square of the distance
proportional with distance cube
If radio propagation attenuation increases with distance, cellular systems will be
relatively inefficient
relaively efficient
No difference
Line-of-sight radio propagation plus a large number of weak scattered, reflected waves lead to
shadow fading
Rayleigh fading
Rician fading
Small scale multipath propagation is caused due to waves with
Different propagation delays and different amplitudes only
Different propagation delays only
Different propagation delays, different amplitudes and different phases
Different propagation delays and different phases only
The effects of small scale multipath propagation are
Changes in signal strength and Time dispersion
Random frequency modulation and change in signal strength
Time dispersion only
Changes in signal strength, time dispersionand random frequency modulation
The mechanism behind electromagnetic wave propagation cannot be attributed
Reflection
Diffraction
Scattering
Sectoring
Free space propagation model is to predict ______
Received signal strength
Transmitted power
Gain of transmitter
Gain of receiver
EIRP is abbreviated as __________
Effective isotropic radiated power
Effective isotropic radio power
Effective and immediate radiated power
Effective and immediate ratio of power
Path loss in free space model is defined as difference of ________
Effective transmitted power and gain
Effective received power and distance between TX-RX
Gain and received power
Effective transmitter power and receiver power
Power density is basically termed as______ power per unit area.
Reflected
Refracted
Radiated
Diffracted
What is the dimension of object as compared to wavelength of propagating wave when reflection occurs?
Large
Small
Same
Very small
In ionosphere propagation, waves arriving at the receiving antenna using the phenomenon of _______
Scattering
Refraction
Diffraction
Radiation
Friis free space equation
1. Is an expression for noise power
2. Is a function of transmitting and receiving antenna gain
3. Depends upon the distance between transmitting and receiving antenna
1) and 2) are correct
All the three are correct
1) and 3) are correct
2) and 3) are correct.
In free space, radio waves travel at a speed of:
3 × 106 meters per second
300 × 106 meters per second
3 × 106 miles per second
300 × 106 miles per second
Radio waves sometimes “bend” around a corner because of:
reflection
diffusion
refraction
diffraction
In a communications system, noise is most likely to affect the signal
at the transmitter
in the channel
in the information source
at the destination
The propagation model that estimates radio coverage of a transmitter is called ___________
Large scale propagation model
Small scale propagation model
Fading model
Okumura model
Propagation model that characterize rapid fluctuation is called _________
Hata model
Fading model
Large scale propagation model
Okumura model
Small scale propagation model is also known as _________
Fading model
Micro scale propagation model
Okumura model
Hata model
Relation between gain and effective aperture is given by ______
G=(4πAe)/λ2
G=(4π λ2)/Ae
G=4πAe
G=Ae/λ2
Relation between wavelength and carrier frequency is _________
λ=c/f
λ=c*f
λ=f/c
λ=1/f
Which of the following antenna radiates power with unit gain uniformly in all directions?
Directional antenna
Dipole antenna
Isotropic antenna
Loop antenna
Far field region is also known as _________
Near field region
Fraunhofer region
Erlang region
Fresnel region
Which of the following is not a practical path loss estimation technique?
Log distance path loss model
Log normal shadowing
Determination of percentage of coverage area
Hata model
Average received signal power decreases __________ with distance.
Exponentially
Logarithmically
Two times
Four times
Log normal shadowing implies that measured signal levels at specific T-R separation have ______ distribution when signal levels have values in dB units.
Rayleigh
Gamma
Gaussian
Nakagami
A link budget is accounting of all __________
Gain and losses from the transmitter
Power transmitted by transmitter
Power received by receiver
Power transmitted and received
Small scale fading describes the _________ fluctuations of the amplitude, phases of a signal.
Rapid
Slow
Instantaneous
Different
Fading is caused by interference.
True
False
Which of the following is not an effect caused by multipath in radio channel?
Rapid changes in signal strength
Random frequency modulation
Power of base station
Time dispersion
Fading does not occur when mobile receiver is stationary.
True
False
Apparent shift in frequency in multipath wave is caused due to relative motion between________
Base station and MSC
Mobile and surrounding objects
Mobile and MSC
Mobile and base station
Signal will distort if transmitted signal bandwidth is greater than bandwidth of __________
Receiver
Radio channel
Transceiver
Multipath channel
What is a measure of the maximum frequency difference for which signals are strongly correlated in amplitude?
Coherence bandwidth
Narrow bandwidth
Incoherent bandwidth
Wide bandwidth
Which of the following describes time varying nature of the channel in a small scale region?
Delay spread and coherence time
Coherence bandwidth and delay spread
Doppler spread and coherence time
Delay spread and doppler spread
______ leads to time dispersion and frequency selective fading.
a)
b)
c)
d)
Doppler spread
Multipath delay spread
Time dispersive parameters
Frequency delay spread
Which of the following s not a characteristic of flat fading?
Mobile radio channel has constant gain
Linear phase response
Non linear phase response
Bandwidth is greater than the bandwidth of transmitted signal
In a frequency selective fading, mobile radio channel possess a constant gain and a linear phase over bandwidth smaller than bandwidth of transmitted signal.
True
False
Frequency selective fading channels are also known as ________
Narrowband channel
Wideband channel
Amplitude varying channel
Phase varying channel
For fast fading channel, the coherence time of the channel is smaller than _______ of transmitted signal.
Doppler spread
Bandwidth
Symbol period
Coherence bandwidth
