Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
B
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
View Answer
C
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
View Answer
D
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
View Answer
C
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
View Answer
B
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
View Answer
C
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
View Answer
B
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
View Answer
C
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
View Answer
A
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
View Answer
C