Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 96
Q1321:
Which of the following multiplexing techniques is most commonly used for optical fiber communication?
A. Frequency-Division Multiplexing (FDM)
B. Time-Division Multiplexing (TDM)
C. Wavelength-Division Multiplexing (WDM)
D. Space-Division Multiplexing (SDM)
Correct Answer:
C
Chapter: 96
Q1322:
What is the role of a demultiplexer in a multiplexed communication system?
A. Combines multiple signals
B. Splits the combined signal back into individual signals
C. Increases transmission speed
D. Generates new signals
Correct Answer:
B
Chapter: 96
Q1323:
Fill in the blank: _______ is a method of combining multiple signals into one signal over a shared medium.
A. Multiplexing
B. Modulation
C. Encoding
D. Switching
Correct Answer:
A
Chapter: 96
Q1324:
Which component in a multiplexing system assigns time slots to different signals?
A. Multiplexer
B. Demultiplexer
C. Encoder
D. Modulator
Correct Answer:
A
Chapter: 96
Q1325:
What happens if two signals are assigned overlapping time slots in TDM?
A. Interference occurs
B. Data transmission speed increases
C. Multiplexing efficiency improves
D. Signals are automatically corrected
Correct Answer:
A
Chapter: 96
Q1326:
Which of the following is a key application of Time-Division Multiplexing?
A. Digital telephony
B. AM radio broadcasting
C. Power transmission
D. Magnetic storage
Correct Answer:
A
Chapter: 96
Q1327:
Fill in the blank: TDM is an example of _______ multiplexing.
A. Space-Division
B. Frequency-Division
C. Time-Based
D. Code-Division
Correct Answer:
C
Chapter: 96
Q1328:
What is a major disadvantage of TDM?
A. High hardware cost
B. Inefficient bandwidth utilization
C. Requires separate frequencies for each user
D. Low data transmission speed
Correct Answer:
A
Chapter: 96
Q1329:
Fill in the blank: _______ is used in digital transmission to allocate time slots for multiple users.
A. Frequency-Division Multiplexing
B. Time-Division Multiplexing
C. Space-Division Multiplexing
D. Packet Switching
Correct Answer:
B
Chapter: 96
Q1330:
What is the function of a multiplexer?
A. Splits a signal into multiple outputs
B. Combines multiple input signals into one
C. Reduces noise in the signal
D. Increases data transmission speed
Correct Answer:
B
Chapter: 97
Q1331:
What does Synchronous Time-Division Multiplexing (TDM) do?
A. Assigns fixed time slots to each signal
B. Dynamically allocates time slots
C. Uses different frequencies for each signal
D. Compresses data before transmission
Correct Answer:
A
Chapter: 97
Q1332:
In Synchronous TDM, time slots are allocated to signals _______.
A. Dynamically
B. Based on demand
C. Evenly and in a fixed manner
D. Only when data is available
Correct Answer:
C
Chapter: 97
Q1333:
Fill in the blank: In Synchronous TDM, each device gets a _______ time slot, even if it has no data to send.
A. Dynamic
B. Fixed
C. Variable
D. Random
Correct Answer:
B
Chapter: 97
Q1334:
Which of the following is a major disadvantage of Synchronous TDM?
A. High bandwidth utilization
B. Wasted bandwidth if a device has no data to send
C. Inefficient for analog signals
D. Requires separate frequencies for each user
Correct Answer:
B
Chapter: 97
Q1335:
What is the main difference between Synchronous TDM and Statistical TDM?
A. Synchronous TDM dynamically assigns slots
B. Statistical TDM allocates time slots even when there is no data
C. Synchronous TDM assigns fixed time slots
D. Statistical TDM does not use multiplexers
Correct Answer:
C
Chapter: 97
Q1336:
Which component is responsible for assigning time slots in Synchronous TDM?
A. Demultiplexer
B. Multiplexer
C. Router
D. Switch
Correct Answer:
B
Chapter: 97
Q1337:
Fill in the blank: In Synchronous TDM, the time slots are divided _______ among all sources.
A. Equally
B. Randomly
C. On demand
D. As per signal strength
Correct Answer:
A
Chapter: 97
Q1338:
What happens to unused time slots in Synchronous TDM?
A. They are assigned to other devices
B. They remain empty and unused
C. They are used for error correction
D. They are combined to form new time slots
Correct Answer:
B
Chapter: 97
Q1339:
What is the primary advantage of Synchronous TDM?
A. Efficient bandwidth usage
B. Guaranteed transmission for each source
C. Reduces hardware costs
D. Reduces the need for synchronization
Correct Answer:
B
Chapter: 97
Q1340:
Which of the following is an example of Synchronous TDM?
A. Ethernet
B. SONET/SDH
C. Wi-Fi
D. Bluetooth
Correct Answer:
B