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WorksheetsEC8652 WC IAT 1 PART-B
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
1.Which of the following do not undergo free space propagation? (CO1) (B3)
a)
Satellite communication system
b)
Microwave line of sight radio links
c)
Wireless line of sight radio links
d)
Wired telephone systems
2.
2.Relation between gain and effective aperture is given by ______(CO1) (B4)
a)
G=(4πAe)/λ2
b)
G=(4π λ2)/Ae
c)
G=4πAe
d)
G=Ae/λ2
3.
3.What does path loss exponent indicates?(CO1) (B3)
a)
Rate at which path loss decreases with distance
b)
Rate at which path loss increases with distance
c)
Rate at which path loss decreases with power density
d)
Rate at which path loss increases with power density
4.
4.Log normal shadowing implies that measured signal levels at specific T-R separation have ______ distribution when signal levels have values in dB units.(CO1) (B3)
a)
Rayleigh
b)
Gamma
c)
Gaussian
d)
Binomial
5.
5.Which of the following is not an effect caused by multipath in radio channel? (CO1) (B4)
a)
Rapid changes in signal strength
b)
Random frequency modulation
c)
Power of Transmitter
d)
Time dispersion
6.
6.How the measure of the maximum frequency difference for which signals have strong amplitude correlation is called? (CO1)(B3)
a)
Coherence bandwidth
b)
Narrow bandwidth
c)
Incoherent bandwidth
d)
Wide bandwidth
7.
7.What is the value of far-field distance df for a transmitting antenna, if the largest dimension of the antenna is 2 meters ,that operates for a wavelength of 0.3 m? (CO1)(B4)
a)
26.67 m
b)
28.09 m
c)
30.13 m
d)
10.64 m
8.
8.For fast fading channel, the coherence time (Tc) of the channel is smaller than _______ of transmitted signal.(CO1)(B4)
a)
Doppler spread (Bd)<br />
b)
Bandwidth of the signal (Bs)
c)
Symbol period (Ts)
d)
Coherence bandwidth (Bc)
9.
9.For Frequency slective fading, the required condition is_______________________(CO1)(B4)
a)
Bs>Bc; Ts<στ
b)
Bs<<Bc; Ts>>στ
c)
Ts>Tc;Bs<BD
d)
Ts<<Tc;Bs>>BD
10.
10. If Ts<<Tc and Bs>>BD, such a condition will result in ___________________________ (CO1)(B3)
a)
Fast Fading
b)
Slow Fading
c)
Frequency Selective Fading
d)
Flat Fading
11.
11.In wideband systems, the transmission bandwidth of a single channel _________ coherence bandwidth of the channel.(CO2)(B3)
a)
Equal to
b)
Not related to
c)
Larger than
d)
Smaller than
12.
12. __________ is undesired RF radiation that happens in FDMA.(CO2)(B3)
a)
Intermodulation frequency
b)
Intermediate frequency
c)
Instantaneous frequency
d)
Instrumental frequency
13.
13.Guard band is______________ (CO2)(B3)
a)
The small unused bandwidth between the frequency channels to avoid interference
b)
The bandwidth allotted to the signal
c)
The channel spectrum
d)
The spectrum acquired by the noise between the signal
14.
14.In FDMA,<br />1. Each user is assigned unique frequency slots<br />2. Demand assignment is possible<br />3. Fixed assignment is possible<br />4. It is vulnerable to timing problems (CO2)(B3)<br />
a)
1) and 2) are correct
b)
2) and 4) are correct
c)
1), 2) and 3) are correct
d)
All four are correct
15.
15.Cable television is an example of______________ (CO2)(B3)
a)
FDMA
b)
TDMA
c)
CDMA
d)
SDMA
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