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Digital Communications
Digital Communications
Link Budget Analysis and Error Control
Question 1
Marks :
+2
|
-2
Pass Ratio :
100%
Antenna gain ______ as effective area increases.
Increases
Decreases
Remains same
None of the mentioned
Explanation:
Antenna gain increases with a decrease in wavelength increase in frequency and increase in effective area.
Question 2
Marks :
+2
|
-2
Pass Ratio :
100%
Thermal noise is generated due to
Lossy coupling
Lossless coupling
Lossy & Lossless coupling
None of the mentioned
Explanation:
Thermal noise occurs due to the thermal motion of electrons in all conductors. It occurs due to lossy coupling between an antenna and the receiver.
Question 3
Marks :
+2
|
-2
Pass Ratio :
100%
The stop and wait ARQ needs _______ connection.
Half duplex
Full duplex
Simplex
None of the mentioned
Explanation:
The stop and wait ARQ needs half duplex system since the transmitter needs ACK for each transmission.
Question 4
Marks :
+2
|
-2
Pass Ratio :
100%
In continuous ARQ will pullback uses _____ system.
Half duplex
Full duplex
Simplex
None of the mentioned
Explanation:
The ARQ procedure called continuous ARQ with pullback requires full duplex connection.
Question 5
Marks :
+2
|
-2
Pass Ratio :
100%
Field of view is ______ to antenna gain.
Proportional
Inversely proportional
Half the
Double
Explanation:
The antenna field of view is the measure of a solid angle in which most of the field power is concentrated. It is inversely related to antenna gain.
Question 6
Marks :
+2
|
-2
Pass Ratio :
100%
Visibility is ________ to required availability.
Proportional
Inversely proportional
Equal
Not related
Explanation:
For a fixed link margin, visibility is inversely proportional to the required availability, and for a fixed availability visibility increases monotonically with margin.
Question 7
Marks :
+2
|
-2
Pass Ratio :
100%
The link availability measures the percentage of time the link can be ______
Open
Closed
Used
None of the mentioned
Explanation:
Link availability is the measure of long term link utility stated on an average annual basis for a given geographical location, the link availability measures the percentage of time the link can be closed.
Question 8
Marks :
+2
|
-2
Pass Ratio :
100%
Path loss Ls is dependent on
Signal power
Effective area
Wavelength
Antenna size
Explanation:
The path loss is wavelength(frequency) dependent.
Question 9
Marks :
+2
|
-2
Pass Ratio :
100%
The beam-width becomes narrower on
Increasing frequency
Increasing antenna size
Increasing frequency & antenna size
None of the mentioned
Explanation:
Increasing either the signal frequency or antenna size results in narrower beam-width.
Question 10
Marks :
+2
|
-2
Pass Ratio :
100%
In analog receivers, noise bandwidth is _________ signal bandwidth.
Lesser than
Greater than
Equal to
Not related
Explanation:
With analog receivers, noise bandwidth seen by the demodulator is usually greater than the signal bandwidth.
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