Digital Communications

INTELSAT

Question 1
Marks : +2 | -2
Pass Ratio : 100%
TWTA which operates in the linear region
Reduces interference
Provide less overall power
Is power limited
All of the mentioned
Explanation:
TWTA operating in the linear region reduces interference, and can provide less overall power. The channel becomes power limited and can service fewer carriers.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
INTELSAT II and III operates their TWTA in
Saturation region
Linear region
Hard limiting region
None of the mentioned
Explanation:
INTELSAT II and III operate its traveling wave tube amplifiers in linear region.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
SPADE is a
MAA system
DAMA system
MAA & DAMA system
None of the mentioned
Explanation:
SPADE is a DAMA system where all channels are shared.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In SPADE system, the carrier is done based on
Fixed assignment
Demand assignment
Fixed & Demand assignment
None of the mentioned
Explanation:
In SPADE system, the carrier is assigned dynamically, that is on demand.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
SPADE uses
QPSK
BPSK
FSK
MSK
Explanation:
SPADE uses digital voice transmission – QPSK.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
As the number of carriers increases, the number of guard bands
Increases
Decreases
Remains the same
None of the mentioned
Explanation:
Guard bands are needed between the carriers. Thus as carriers increases, guard bands are also increases.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
As the number of carriers, the capacity of the transponder
Increases
Decreases
Remains the same
None of the mentioned
Explanation:
The capacity of the transponder drops as the number of carriers increases.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which technique needs precise synchronization?
TDMA
FDMA
TDMA & FDMA
None of the mentioned
Explanation:
TDMA operation needs very precise synchronization needed to assure orthogonality of time slots.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which is more costlier?
TDMA
FDMA
ALOHA
None of the mentioned
Explanation:
TDMA earth station equipment is more costlier than the FDMA equipments.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which method is better when traffic is heavy?
SPADE
Binary tree search
SPADE & Binary tree search
None of the mentioned
Explanation:
SPADE operation and binary tree search can be used when the traffic is heavy.