Digital Communications Multiple Choice Questions on “TDM and FDM”.
1. Which is based on orthogonality?
A. TDM
B. FDM
C. TDM & FDM
D. None of the mentioned
Answer: B
Clarification: FDM technique is based on the orthogonality of sinusoids.
2. Which provides constant delay?
A. Synchronous TDM
B. Non synchronous TDM
C. Synchronous & Non synchronous TDM
D. None of the mentioned
Answer: A
Clarification: Synchronous time division multiplexing provides constant bandwidth and constant delay.
3. Random access is
A. Distributed
B. Fault tolerant
C. Distributed & Fault tolerant
D. None of the mentioned
Answer: C
Clarification: Random access is simple, distributed and very fault tolerant.
4. Example of reservation system is
A. Synchronous TDM
B. Non synchronous TDM
C. Synchronous & Non synchronous TDM
D. None of the mentioned
Answer: A
Clarification: Synchronous TDM is an example for the reservation system.
5. Reservation systems are useful when
A. Delay is small
B. Delay is large
C. Delay is small or large
D. None of the mentioned
Answer: B
Clarification: Reservation systems are useful when delays are large.
6. In slotted system, access is
A. Synchronous
B. Asynchronous
C. Synchronous & Asynchronous
D. None of the mentioned
Answer: B
Clarification: In slotted system, access is asynchronous and requires addressing information inside.
7. In CSMA, collision window is _____ to cable length.
A. Equal
B. Greater
C. Lesser
D. None of the mentioned
Answer: B
Clarification: The collision window is twice the cable length.
8. Which isolates collision?
A. Bridges
B. Routers
C. Bridges & Routers
D. None of the mentioned
Answer: C
Clarification: Bridges and routers isolates collision.
9. Minimum packet size increases as
A. Speed increases
B. Distance increases
C. Speed & Distance increases
D. None of the mentioned
Answer: C
Clarification: As speed and distance goes up, minimum packet size also goes up.
10. Which are non orthogonal multiplexing?
A. TDM
B. FDM
C. TDM & FDM
D. None of the mentioned
Answer: D
Clarification: TDM and FDM are both orthogonal multiplexing.