Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
Q1141: What is a limitation of PSK in digital communication?
- A: Low power efficiency
- B: Difficulty in distinguishing small phase differences
- C: High bandwidth requirement
- D: High noise interference
View Answer
B
Q1142: PSK's bit rate is limited by _______.
- A: Noise interference
- B: The ability to detect small phase changes
- C: The number of transmitters
- D: The modulation index
View Answer
B
Q1143: What happens if two characteristics of a sine wave are altered instead of one?
- A: The signal becomes unstable
- B: A new modulation scheme is created
- C: Noise is completely eliminated
- D: The phase shift disappears
View Answer
B
Q1144: Which two modulation schemes can be combined to form a new modulation technique?
- A: ASK and PSK
- B: AM and FM
- C: BPSK and QPSK
- D: FSK and PSK
View Answer
A
Q1145: The graphical representation of phase and amplitude variations in a modulation scheme is called a _______.
- A: Eye Diagram
- B: Constellation Diagram
- C: Nyquist Plot
- D: Modulation Chart
View Answer
B
Q1146: A constellation diagram is used to visualize _______.
- A: Signal strength
- B: Modulation techniques
- C: Antenna positions
- D: Network topologies
View Answer
B
Q1147: The main benefit of a constellation diagram is to show _______.
- A: Data throughput
- B: Error detection
- C: Phase and amplitude variations
- D: Channel bandwidth
View Answer
C
Q1148: When ASK and PSK are combined, the resulting modulation technique is called _______.
- A: Frequency Hopping
- B: Quadrature Amplitude Modulation (QAM)
- C: Spread Spectrum
- D: Frequency Shift Keying (FSK)
View Answer
B
Q1149: The primary reason for combining ASK and PSK is to _______.
- A: Improve noise resistance
- B: Increase bandwidth
- C: Enhance error detection
- D: Reduce hardware cost
View Answer
A
Q1150: Which modulation scheme is known for altering both phase and amplitude?
- A: PSK
- B: FSK
- C: QAM
- D: ASK
View Answer
C