Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 91
Q1241:
What is the purpose of a guard band in FDM?
A. To increase bandwidth efficiency
B. To separate adjacent frequency channels
C. To boost the signal strength
D. To improve data compression
Correct Answer:
B
Chapter: 91
Q1242:
If each channel in an FDM system requires a bandwidth of 200 kHz and a guard band of 20 kHz, how much bandwidth is required for 4 channels?
A. 800 kHz
B. 820 kHz
C. 880 kHz
D. 920 kHz
Correct Answer:
C
Chapter: 91
Q1243:
Which of the following is NOT a characteristic of FDM?
A. Each signal is modulated onto a different frequency
B. Signals are separated by guard bands
C. It is commonly used for analog transmission
D. It assigns time slots to each signal
Correct Answer:
D
Chapter: 91
Q1244:
A Frequency-Division Multiplexing system has six signals, each requiring 50 kHz. If a 5 kHz guard band is required between each signal, what is the total bandwidth needed?
A. 300 kHz
B. 305 kHz
C. 325 kHz
D. 355 kHz
Correct Answer:
C
Chapter: 91
Q1245:
Which of the following is an application of FDM?
A. Ethernet
B. AM and FM radio broadcasting
C. Packet switching
D. Digital signal processing
Correct Answer:
B
Chapter: 91
Q1246:
If three signals of 10 kHz each are multiplexed using FDM with a 2 kHz guard band between them, what is the minimum bandwidth required?
A. 30 kHz
B. 32 kHz
C. 34 kHz
D. 36 kHz
Correct Answer:
C
Chapter: 91
Q1247:
In which domain is the frequency-domain representation of signals used for multiplexing?
A. Time domain
B. Frequency domain
C. Phase domain
D. Amplitude domain
Correct Answer:
B
Chapter: 91
Q1248:
If an FDM system has five channels, each requiring 150 kHz with 10 kHz guard bands between them, what is the total bandwidth required?
A. 750 kHz
B. 760 kHz
C. 790 kHz
D. 800 kHz
Correct Answer:
C
Chapter: 91
Q1249:
Which of the following is a disadvantage of FDM?
A. It requires more bandwidth
B. It is inefficient for digital signals
C. It cannot handle multiple users
D. It does not allow full-duplex communication
Correct Answer:
A
Chapter: 92
Q1250:
What type of multiplexing is used by telephone companies to combine signals from lower-bandwidth lines onto higher-bandwidth lines?
A. Time-Division Multiplexing
B. Code-Division Multiplexing
C. Frequency-Division Multiplexing
D. Space-Division Multiplexing
Correct Answer:
C
Chapter: 92
Q1251:
In analog communication, which multiplexing technique is primarily used?
A. Time-Division Multiplexing (TDM)
B. Frequency-Division Multiplexing (FDM)
C. Code-Division Multiplexing (CDM)
D. Wavelength-Division Multiplexing (WDM)
Correct Answer:
B
Chapter: 92
Q1252:
What is the primary reason for multiplexing signals in communication systems?
A. To increase bandwidth usage
B. To reduce the number of required channels
C. To improve signal strength
D. To eliminate noise
Correct Answer:
B
Chapter: 92
Q1253:
Which of the following is NOT an advantage of Frequency-Division Multiplexing?
A. Allows multiple signals over a single link
B. Reduces transmission latency
C. Efficient for analog signals
D. Requires guard bands between signals
Correct Answer:
B
Chapter: 92
Q1254:
In an FDM system, what prevents signals from interfering with each other?
A. Amplification
B. Guard bands
C. Higher bandwidth
D. Digital encoding
Correct Answer:
B
Chapter: 92
Q1255:
If each channel in an FDM system requires 10 kHz, and a 2 kHz guard band is needed between adjacent channels, what is the bandwidth required for 5 channels?
A. 50 kHz
B. 52 kHz
C. 54 kHz
D. 56 kHz
Correct Answer:
C
Chapter: 92
Q1256:
In Frequency-Division Multiplexing, how are signals separated?
A. By assigning different time slots
B. By using different frequencies
C. By encoding them with unique codes
D. By transmitting them on separate physical links
Correct Answer:
B
Chapter: 92
Q1257:
Which component is essential for demultiplexing FDM signals?
A. Time synchronizer
B. Frequency filter
C. Code generator
D. Modulator
Correct Answer:
B
Chapter: 92
Q1258:
Fill in the blank: _______ is a technique used by telephone companies to combine multiple signals onto a higher-bandwidth line.
A. Space-Division Multiplexing
B. Time-Division Multiplexing
C. Frequency-Division Multiplexing
D. Code-Division Multiplexing
Correct Answer:
C
Chapter: 92
Q1259:
What is the main requirement for FDM to be effective?
A. The bandwidth of the link must be greater than the combined bandwidth of all signals
B. Signals must be in digital form
C. Each channel must have a separate transmission medium
D. The signal must be transmitted in time slots
Correct Answer:
A
Chapter: 92
Q1260:
What is an example of an application that uses Frequency-Division Multiplexing?
A. Fiber-optic communication
B. Ethernet networks
C. AM and FM radio broadcasting
D. Wireless LAN
Correct Answer:
C