Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 83
Q1121:
What is the key characteristic of QPSK that differentiates it from BPSK?
A. It uses amplitude variation
B. It uses frequency shifts
C. It uses four phase shifts
D. It is less efficient
Correct Answer:
C
Chapter: 83
Q1122:
Fill in the blank: BPSK is also known as _______.
A. Phase Reversal Keying
B. Amplitude Inversion Keying
C. Frequency Hopping Keying
D. Quadrature Keying
Correct Answer:
A
Chapter: 83
Q1123:
Which parameter remains constant in QPSK?
A. Amplitude
B. Frequency
C. Phase
D. Symbol rate
Correct Answer:
A
Chapter: 83
Q1124:
What is the symbol duration for QPSK with a bit rate of 16 Mbps?
A. 62.5 ns
B. 125 ns
C. 250 ns
D. 500 ns
Correct Answer:
B
Chapter: 84
Q1125:
What does a Karnaugh Map help to simplify in Boolean algebra?
A. Logic gates
B. Boolean expressions
C. Arithmetic operations
D. Digital circuits
Correct Answer:
B
Chapter: 84
Q1126:
Social networks enable users to communicate with each other by posting _______.
A. information, comments, messages, images, and videos
B. technical documents
C. programming code
D. commercial advertisements
Correct Answer:
A
Chapter: 84
Q1127:
A Karnaugh Map is used in _______.
A. Number theory
B. Simplifying Boolean expressions
C. Data structures
D. Compiler design
Correct Answer:
B
Chapter: 84
Q1128:
The graphical representation of a signal element using two carriers is known as _______.
A. Amplitude Spectrum
B. Constellation Diagram
C. Phase Shift Diagram
D. Carrier Mapping
Correct Answer:
B
Chapter: 84
Q1129:
The two carriers used in a constellation diagram are called _______.
A. Analog and Digital
B. In-phase and Quadrature
C. Amplitude and Frequency
D. Sine and Cosine
Correct Answer:
B
Chapter: 84
Q1130:
A constellation diagram helps define the _______ of a signal element.
A. Frequency
B. Amplitude and Phase
C. Wavelength
D. Modulation index
Correct Answer:
B
Chapter: 84
Q1131:
Which Boolean algebra simplification tool represents expressions as a matrix?
A. Karnaugh Map
B. Truth Table
C. Binary Tree
D. Logic Gates
Correct Answer:
A
Chapter: 84
Q1132:
A constellation diagram is used in _______.
A. Digital Modulation
B. Network Routing
C. Data Encryption
D. Boolean Algebra
Correct Answer:
A
Chapter: 84
Q1133:
The Karnaugh Map is particularly useful for simplifying expressions with how many variables?
A. 2 to 3
B. 4 to 6
C. 7 to 8
D. More than 10
Correct Answer:
B
Chapter: 84
Q1134:
In digital communications, the two main axes in a constellation diagram represent _______.
A. Time and Frequency
B. In-phase and Quadrature components
C. Power and Voltage
D. Bit Rate and Baud Rate
Correct Answer:
B
Chapter: 84
Q1135:
A Karnaugh Map is structured using _______.
A. Rows and Columns
B. Trees and Nodes
C. Flowcharts
D. Binary Heaps
Correct Answer:
A
Chapter: 84
Q1136:
Which of the following is NOT a valid simplification technique in Boolean algebra?
A. Karnaugh Map
B. Boolean Theorems
C. Constellation Diagram
D. Quine-McCluskey Method
Correct Answer:
C
Chapter: 84
Q1137:
The primary benefit of using a Karnaugh Map is to _______.
A. Minimize hardware complexity
B. Increase circuit delay
C. Introduce errors in logic circuits
D. Reduce power consumption
Correct Answer:
A
Chapter: 84
Q1138:
In a constellation diagram, a higher density of dots represents _______.
A. Lower data rate
B. Higher data rate
C. More noise
D. Lower power consumption
Correct Answer:
B
Chapter: 84
Q1139:
The process of arranging dots in a constellation diagram corresponds to _______.
A. Digital encoding
B. Modulation scheme
C. Logical simplification
D. Encryption technique
Correct Answer:
B
Chapter: 84
Q1140:
Which modulation technique is best visualized using a constellation diagram?
A. Amplitude Modulation (AM)
B. Frequency Modulation (FM)
C. Quadrature Amplitude Modulation (QAM)
D. Pulse Code Modulation (PCM)
Correct Answer:
C