250+ TOP MCQs on INTELSAT & Answers

Digital Communications Multiple Choice Questions 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
Answer: B
Clarification: 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
Answer: B
Clarification: 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
Answer: A
Clarification: 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
Answer: D
Clarification: 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
Answer: C
Clarification: 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
Answer: A
Clarification: 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
Answer: B
Clarification: 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
Answer: B
Clarification: 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
Answer: A
Clarification: 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
Answer: A
Clarification: TDMA operation needs very precise synchronization needed to assure orthogonality of time slots.