This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “INTELSAT”.
1. INTELSAT II and III operates their TWTA in
a) Saturation region
b) Linear region
c) Hard limiting region
d) None of the mentioned
View Answer
Explanation: INTELSAT II and III operate its traveling wave tube amplifiers in linear region.
2. As the number of carriers, the capacity of the transponder
a) Increases
b) Decreases
c) Remains the same
d) None of the mentioned
View Answer
Explanation: The capacity of the transponder drops as the number of carriers increases.
3. As the number of carriers increases, the number of guard bands
a) Increases
b) Decreases
c) Remains the same
d) None of the mentioned
View Answer
Explanation: Guard bands are needed between the carriers. Thus as carriers increases, guard bands are also increases.
4. TWTA which operates in the linear region
a) Reduces interference
b) Provide less overall power
c) Is power limited
d) All of the mentioned
View Answer
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.
5. Which method is better when traffic is heavy?
a) SPADE
b) Binary tree search
c) SPADE & Binary tree search
d) None of the mentioned
View Answer
Explanation: SPADE operation and binary tree search can be used when the traffic is heavy.
6. SPADE uses
a) QPSK
b) BPSK
c) FSK
d) MSK
View Answer
Explanation: SPADE uses digital voice transmission – QPSK.
7. SPADE is a
a) MAA system
b) DAMA system
c) MAA & DAMA system
d) None of the mentioned
View Answer
Explanation: SPADE is a DAMA system where all channels are shared.
8. In SPADE system, the carrier is done based on
a) Fixed assignment
b) Demand assignment
c) Fixed & Demand assignment
d) None of the mentioned
View Answer
Explanation: In SPADE system, the carrier is assigned dynamically, that is on demand.
9. Which is more costlier?
a) TDMA
b) FDMA
c) ALOHA
d) None of the mentioned
View Answer
Explanation: TDMA earth station equipment is more costlier than the FDMA equipments.
10. Which technique needs precise synchronization?
a) TDMA
b) FDMA
c) TDMA & FDMA
d) None of the mentioned
View Answer
Explanation: TDMA operation needs very precise synchronization needed to assure orthogonality of time slots.
Sanfoundry Global Education & Learning Series – Digital Communications.
To practice all areas of Digital Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.
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