Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 61
Q781:
Fill in the blank: The mB/nBmB/nBmB/nB encoding technique is an example of ______ coding.
A. Block
B. Line
C. Pulse
D. Analog
Correct Answer:
A
Chapter: 61
Q782:
Which of the following is not a feature of block coding?
A. Ensures synchronization
B. Provides redundancy
C. Reduces complexity
D. Converts m bits to n bits
Correct Answer:
C
Chapter: 61
Q783:
Fill in the blank: Block coding introduces redundancy to help with ______ in digital communication.
A. Error correction
B. Line coding
C. Synchronization
D. Data compression
Correct Answer:
C
Chapter: 61
Q784:
Block coding is most useful in ______.
A. Analog signals
B. Digital signals
C. Wireless communication
D. Optical communication
Correct Answer:
B
Chapter: 62
Q785:
What is the purpose of 4B/5B encoding in block coding?
A. Compression of data
B. Error detection
C. Ensuring synchronization
D. Increasing bandwidth
Correct Answer:
C
Chapter: 62
Q786:
Fill in the blank: In block coding, 4B/5B encoding converts 4 bits into ______ bits.
A. 2
B. 5
C. 6
D. 8
Correct Answer:
B
Chapter: 62
Q787:
Which of the following is an advantage of 4B/5B block coding with NRZ-I?
A. Error detection
B. Synchronization
C. Data compression
D. Power saving
Correct Answer:
B
Chapter: 62
Q788:
Fill in the blank: NRZ-I stands for ______.
A. Non-Return-to-Zero Inverted
B. Non-Recoverable Zone Input
C. Non-Repeating Zero Invert
D. New-Zone Reduced Input
Correct Answer:
A
Chapter: 62
Q789:
What does NRZ-I encoding use to indicate a binary '1'?
A. Change in voltage level
B. No change in voltage level
C. Signal inversion
D. Increased frequency
Correct Answer:
C
Chapter: 62
Q790:
Fill in the blank: In 4B/5B encoding, the additional bit ensures that there are no more than ______ consecutive zeros.
A. 2
B. 4
C. 6
D. 8
Correct Answer:
C
Chapter: 62
Q791:
What problem does 4B/5B encoding solve in digital communication?
A. High power consumption
B. Signal distortion
C. Lack of synchronization
D. Bandwidth limitation
Correct Answer:
C
Chapter: 62
Q792:
Which line coding scheme is typically used with 4B/5B encoding?
A. Manchester encoding
B. NRZ-I
C. Differential encoding
D. Pulse-code modulation
Correct Answer:
B
Chapter: 62
Q793:
Fill in the blank: The ______ coding scheme is commonly paired with 4B/5B encoding to ensure signal integrity.
A. NRZ-I
B. Manchester
C. Polar NRZ
D. RZ
Correct Answer:
A
Chapter: 62
Q794:
What is one main goal of using 4B/5B encoding in digital signals?
A. Data compression
B. Increased redundancy
C. Improved synchronization
D. Reduced error rates
Correct Answer:
C
Chapter: 62
Q795:
In NRZ-I encoding, a binary '0' is represented by ______.
A. A change in signal
B. No change in signal
C. A constant high signal
D. A constant low signal
Correct Answer:
B
Chapter: 62
Q796:
Fill in the blank: The use of redundancy in 4B/5B encoding helps reduce ______ errors.
A. Transmission
B. Synchronization
C. Decoding
D. Compression
Correct Answer:
B
Chapter: 62
Q797:
Which of the following encoding techniques ensures sufficient transitions for clock recovery?
A. NRZ
B. 4B/5B with NRZ-I
C. RZ
D. Pulse coding
Correct Answer:
B
Chapter: 63
Q798:
Block coding changes a block of ‘m’ bits into a block of _______ bits.
A. ‘n’ bits
B. ‘p’ bits
C. ‘k’ bits
D. ‘x’ bits
Correct Answer:
A
Chapter: 63
Q799:
In Block coding, the value of ‘n’ must always be _______ greater than ‘m’.
A. less
B. greater
C. equals
D. none
Correct Answer:
B
Chapter: 63
Q800:
Which of the following is a technique used for encoding in Block coding?
A. mB/nB encoding
B. Binary encoding
C. Gray code encoding
D. Arithmetic encoding
Correct Answer:
A