TDM and FDM

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “TDM and FDM”.

1. Which is based on orthogonality?
a) TDM
b) FDM
c) TDM & FDM
d) None of the mentioned

2. Which provides constant delay?
a) Synchronous TDM
b) Non synchronous TDM
c) Synchronous & Non synchronous TDM
d) None of the mentioned

3. Random access is
a) Distributed
b) Fault tolerant
c) Distributed & Fault tolerant
d) None of the mentioned

4. Example of reservation system is
a) Synchronous TDM
b) Non synchronous TDM
c) Synchronous & Non synchronous TDM
d) None of the mentioned

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

6. In slotted system, access is
a) Synchronous
b) Asynchronous
c) Synchronous & Asynchronous
d) None of the mentioned

7. In CSMA, collision window is _____ to cable length.
a) Equal
b) Greater
c) Lesser
d) None of the mentioned

8. Which isolates collision?
a) Bridges
b) Routers
c) Bridges & Routers
d) None of the mentioned
.

9. Minimum packet size increases as
a) Speed increases
b) Distance increases
c) Speed & Distance increases
d) None of the mentioned

10. Which are non orthogonal multiplexing?
a) TDM
b) FDM
c) TDM & FDM
d) None of the mentioned

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