Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 85
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
Correct Answer:
B
Chapter: 85
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
Correct Answer:
B
Chapter: 85
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
Correct Answer:
B
Chapter: 85
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
Correct Answer:
A
Chapter: 85
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
Correct Answer:
B
Chapter: 85
Q1146:
A constellation diagram is used to visualize _______.
A. Signal strength
B. Modulation techniques
C. Antenna positions
D. Network topologies
Correct Answer:
B
Chapter: 85
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
Correct Answer:
C
Chapter: 85
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)
Correct Answer:
B
Chapter: 85
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
Correct Answer:
A
Chapter: 85
Q1150:
Which modulation scheme is known for altering both phase and amplitude?
A. PSK
B. FSK
C. QAM
D. ASK
Correct Answer:
C
Chapter: 85
Q1151:
In a constellation diagram, each dot represents a _______.
A. Bit
B. Symbol
C. Packet
D. Frame
Correct Answer:
B
Chapter: 85
Q1152:
The number of points in a constellation diagram is determined by _______.
A. Noise level
B. Modulation order
C. Signal-to-noise ratio
D. Transmission power
Correct Answer:
B
Chapter: 85
Q1153:
A higher number of dots in a constellation diagram indicates _______.
A. More noise in the signal
B. Lower bit rate
C. Higher data rate
D. More bandwidth usage
Correct Answer:
C
Chapter: 85
Q1154:
Which modulation technique uses four distinct phase shifts?
A. BPSK
B. QPSK
C. FSK
D. ASK
Correct Answer:
B
Chapter: 85
Q1155:
The spacing between points in a constellation diagram determines _______.
A. Signal bandwidth
B. Noise immunity
C. Power efficiency
D. Transmission distance
Correct Answer:
B
Chapter: 85
Q1156:
Which modulation technique has the simplest constellation diagram?
A. QAM
B. BPSK
C. QPSK
D. 16-QAM
Correct Answer:
B
Chapter: 85
Q1157:
The ability of a receiver to distinguish phase differences in PSK is limited by _______.
A. Signal power
B. Noise interference
C. Equipment accuracy
D. Antenna gain
Correct Answer:
C
Chapter: 85
Q1158:
A constellation diagram provides insight into _______.
A. Signal distortion
B. Frequency shifts
C. Digital data representation
D. Transmission latency
Correct Answer:
C
Chapter: 85
Q1159:
The advantage of QAM over PSK is _______.
A. Lower error rate
B. Higher data rates
C. Simpler implementation
D. Less bandwidth usage
Correct Answer:
B
Chapter: 86
Q1160:
What does Amplitude Modulation (AM) primarily modify in a signal?
A. Frequency
B. Phase
C. Amplitude
D. Wavelength
Correct Answer:
C