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WorksheetsEC8652 WC IAT 1 PART-A
Total questions: 30
Worksheet time: 30mins
Name
Class
Date
1.
1. In wireless communication systems the medium of propagation of signals is_____________________________ (CO1) (B2)
a)
Optical Fiber Cables
b)
Twisted Pair of Cables
c)
Open Air Interface
d)
Wave Guides
2.
2. Among the following Identify the communication system, in which LOS communication is followed. (CO1)(B2)
a)
Micrwave Communication Links
b)
High speed Optical Networks
c)
Under Water Communication systems
d)
Wireless LAN
3.
3. The signal strength ________________________ as the distance between the transmitter and receiver increases. (CO1)(B2)
a)
increases
b)
remains same
c)
decreases
d)
becomes zero
4.
4.___________________ are used to predict the average received signal strength at a distance from the transmitter, as well as the variability of the signal strength in close proximity to a particular location. (CO1)(B2)
a)
Propogation Models
b)
Propagation Mechanisms
c)
Power Delay Profiles
d)
Channel Line Models
5.
5. Large Scale Models are used to characterize the signal strength when the T-R seperation is ___________________ (CO1) (B1)
a)
within a building
b)
within 50 meters
c)
exceeds several 100 meters
d)
is exactly 10 meters
6.
6. Unlike Large scale models, small scale models do not characterise the pathloss, but it characterises the ____________ (CO1) (B1)
a)
attenuation
b)
noise
c)
interference
d)
fluctuations and fading
7.
7. According to Frii's equation of free space propagation, the Received Power is expressed as a function of __________ (CO1) (B2)
a)
wavelength of the Signal
b)
Gains of antennae involved
c)
transmitter -receiver seperation distance
d)
the total loss due to the hardware
8.
8. The Factor (λ/ 4πd)^2 is frii's equation corresponds to________________ (CO1) (B1)
a)
System Loss Factor
b)
Free space Loss factor
c)
Overall Gain
d)
Frii's Coefficient
9.
9.If an antenna is radiating power in all directions uniformly with unity gain, one such ideal radiator is known as____________ (CO1) (B1)
a)
Adiabatic Radiator
b)
Isotropic Radiator
c)
Ergodic Radiator
d)
Free Radiator
10.
10.The difference between the effective transmitted power and effective received power when expressed in dB scale, it is termed as_______________ (CO1)(B1)
a)
Path loss
b)
Transmission Loss
c)
Receiver Loss
d)
System Loss
11.
11. The distance from an antenna, beyond its Far field distance df, which is also related to the largest physical dimension of the antenna and the wavelenth of the transmitted signal is known as ________________(CO1)(B1)
a)
Franklin distance
b)
Frii's distance
c)
Fraunhofer distance
d)
Fergussion distance
12.
12. Which among the following is the main limitation of Two ray ground reflection model? (CO1)(B2)
a)
It considers an LOS Path and only one reflected path,wherea as in reality there are more reflected paths in between T-R
b)
The effects of rapid signal fluctuations due to interacting obejcts is not considered
c)
Type of the Transmitter and Reciver antenna structures are more generalised
d)
No inclusion of other propagation mechanisms like diffraction and scattering
13.
13.In two ray model ,___________________ is the difference in the distances travelled by ground reflected component and LOS components. (CO1)(B1)
a)
Path Difference
b)
Phase difference
c)
Time Delay
d)
Amplitude difference
14.
14.The Path Difference Δ =___________________ (CO1)(B1)
a)
2hthr/d
b)
4π(d^2)
c)
λ/4π
d)
4(ht)^2(hr)^2/d^2
15.
15.For situations like , if the distance between Transmitter and receiver are very large, then the path difference Δ becomes very negligibel, that results in ________________________ (CO1)(B1)
a)
|E-LOS| ≈ |Eg|
b)
|E-LOS| > |Eg|
c)
|E-LOS| < |Eg|
d)
|E-LOS| = 0
16.
16._________________________- is the clearest and most sensitive way of computing the required amount of transmitting power by considering all the power losses that can occur in a radio path.(CO1)(B1)
a)
Power Delay Profile
b)
Power Estimate
c)
Link Budget
d)
Delay Times model
17.
17.In log distance path loss model, the ensemble average of path loss at a point , is expressed as a function of distance with reference to a power at a known point raised to___________________________ (CO1)(B2)
a)
Delay Exponent
b)
Pahse Deviation Exponent
c)
Pathloss Exponent
d)
Gain margin Exponent
18.
18. In Log distance path loss models, the path loss exponent (n) that corresponds to a Urban area cellular radio system can be in the range_______________ (CO1)(B1)
a)
2.7-3.5
b)
3.0 -5.0
c)
1.6-1.8
d)
4.0 - 6.0
19.
19.The disadvantage of Log distance pathloss model is over come by log normal shadowing model by including ________________ (CO1)(B1)
a)
an arbitrary constant
b)
a factor (random variable) that represents the effects of shadowing due to sorrounding objects
c)
the interference among the multipath components
d)
a factor that considers the sorroung noise
20.
20._____________________ are used to allow many users to communicate with each other simultaneously through a finite amount of radio spectrum (CO2) (B1)
a)
Multiple antennas
b)
Multiplexing
c)
Multiple Access Techniques
d)
Diversity Techniques
21.
21.The foremost objective of Multiple Access techniques is to __________________________________ (CO2)(B1)
a)
Maximise the channel utilisation
b)
Maximise the performance
c)
Minimise the conflicts among users
d)
Neutralise the effects of congestion
22.
22. The FDD provides __________________ distinct bands of frequecies for Forward and Reverse communications (CO2)(B1)
a)
1
b)
2
c)
4
d)
8
23.
23.In ______________________ the available radio spectrum (bandwidth ) is divided into large number of narrowband channels (CO2)(B1)
a)
CDMA/FDD
b)
CDMA/TDD
c)
FDMA/FDD
d)
SSMA
24.
24.Identify among the following, the cellular standard that use FDMA/FDD (CO2)(B1)
a)
US-Digital Cellular
b)
GSM
c)
DECT
d)
AMPS
25.
25. GSM Technology uses the _______________ multiple access scheme.(CO2)(B1)
a)
FDMA/FDD
b)
FDMA/TDD
c)
TDMA/FDD
d)
CDMA
26.
26. The interference with adjascent sub band frequencies in FDMA is overcome by________________(CO2)(B1)
a)
Guard Bands
b)
Guard Time Interval
c)
Intermodulation of signals
d)
Purposeful Jitter
27.
27. The Number of Channels (Ns) that can be simultaneously supported in a FDMA system is given by ______________(CO2)(B1)
a)
Ns= (Bs - 2Bg)/Bc
b)
Ns= (Bs + 2Bg)/Bc
c)
Ns= (2Bs -Bg)/Bc
d)
Ns= (2Bs + Bg)/Bc
28.
28.The most commonly used multiple access method for analog voice and data transmission is ______________(CO2)(B1)
a)
CDMA
b)
SDMA
c)
TDMA
d)
FDMA
29.
29.In CDMA, the multiple access is achieved by assigning each user a different______________________(CO2)(B1)
a)
Code
b)
Time
c)
Frequency
d)
Overhead
30.
30.TDMA users are permitted to transmit their signals in their assigned time slots only in__________________(CO2)(B1)
a)
Frame to Frame
b)
Packets
c)
Burst mode
d)
symbols
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