Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 92
Q1261:
Fill in the blank: In FDM, each signal is modulated onto a different _______.
A. Time slot
B. Amplitude
C. Frequency
D. Bit rate
Correct Answer:
C
Chapter: 92
Q1262:
In FDM, a composite signal is formed by combining multiple _______.
A. Time slots
B. Frequency bands
C. Data packets
D. Bit sequences
Correct Answer:
B
Chapter: 92
Q1263:
If a telephone network uses analog transmission, which technique is used to combine multiple calls?
A. Time-Division Multiplexing
B. Frequency-Division Multiplexing
C. Code-Division Multiplexing
D. Wavelength-Division Multiplexing
Correct Answer:
B
Chapter: 92
Q1264:
Which of the following is NOT true about Frequency-Division Multiplexing?
A. Each signal is modulated onto a unique carrier frequency
B. FDM is mainly used for digital signals
C. Guard bands are used to separate signals
D. A demultiplexer extracts individual signals at the receiving end
Correct Answer:
B
Chapter: 92
Q1265:
What is the disadvantage of FDM?
A. Requires high-speed clocks
B. Increases bandwidth efficiency
C. Requires guard bands, which reduce efficiency
D. Works only with digital signals
Correct Answer:
C
Chapter: 92
Q1266:
Fill in the blank: In an FDM system, signals are combined into a _______ before transmission.
A. Digital packet
B. Single composite signal
C. Time slot
D. Separate data stream
Correct Answer:
B
Chapter: 93
Q1267:
What is the main advantage of using fiber-optic cables over metallic transmission cables?
A. Higher data rate
B. Lower cost
C. Greater flexibility
D. More interference
Correct Answer:
A
Chapter: 93
Q1268:
Why is using a fiber-optic cable for a single line considered wasteful?
A. It has a limited lifespan
B. It requires frequent maintenance
C. It has high bandwidth capacity
D. It is prone to signal loss
Correct Answer:
C
Chapter: 93
Q1269:
What technique allows multiple signals to be transmitted over a single fiber-optic cable?
A. Frequency-Division Multiplexing (FDM)
B. Time-Division Multiplexing (TDM)
C. Wavelength-Division Multiplexing (WDM)
D. Code-Division Multiplexing (CDM)
Correct Answer:
C
Chapter: 93
Q1270:
What component is essential in Wavelength-Division Multiplexing (WDM) for combining different wavelengths?
A. Amplifier
B. Prisms
C. Resistor
D. Capacitor
Correct Answer:
B
Chapter: 93
Q1271:
In Wavelength-Division Multiplexing (WDM), how are different signals separated?
A. By assigning different time slots
B. By using different frequencies
C. By assigning different wavelengths
D. By using separate physical channels
Correct Answer:
C
Chapter: 93
Q1272:
Fill in the blank: _______ is a technique used to combine multiple optical signals into a single fiber-optic cable.
A. Frequency-Division Multiplexing
B. Wavelength-Division Multiplexing
C. Time-Division Multiplexing
D. Space-Division Multiplexing
Correct Answer:
B
Chapter: 93
Q1273:
Which of the following is NOT an advantage of Wavelength-Division Multiplexing?
A. Increases fiber-optic cable efficiency
B. Allows multiple signals to travel simultaneously
C. Requires less bandwidth per signal
D. Requires precise wavelength separation
Correct Answer:
C
Chapter: 93
Q1274:
What optical component is used in WDM to split and combine different wavelengths?
A. Filter
B. Diode
C. Prism
D. Modulator
Correct Answer:
C
Chapter: 93
Q1275:
What is the key feature of Wavelength-Division Multiplexing?
A. It assigns different frequencies to signals
B. It uses different wavelengths for transmission
C. It divides signals based on time slots
D. It encodes signals using unique codes
Correct Answer:
B
Chapter: 93
Q1276:
What is the purpose of using multiplexing in fiber-optic communication?
A. To reduce power consumption
B. To increase bandwidth utilization
C. To eliminate signal loss
D. To minimize interference
Correct Answer:
B
Chapter: 93
Q1277:
Which type of multiplexing is most suitable for fiber-optic communication?
A. Time-Division Multiplexing
B. Frequency-Division Multiplexing
C. Wavelength-Division Multiplexing
D. Space-Division Multiplexing
Correct Answer:
C
Chapter: 93
Q1278:
What is the main reason for using Wavelength-Division Multiplexing?
A. To increase fiber-optic efficiency
B. To reduce the number of transmission lines
C. To enhance signal clarity
D. To improve network security
Correct Answer:
A
Chapter: 93
Q1279:
Fill in the blank: In WDM, signals are transmitted using different _______.
A. Frequencies
B. Time slots
C. Wavelengths
D. Power levels
Correct Answer:
C
Chapter: 93
Q1280:
What is a key requirement for effective Wavelength-Division Multiplexing?
A. Low bandwidth usage
B. Precise wavelength separation
C. Limited data channels
D. High noise levels
Correct Answer:
B