Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 68
Q861:
Which of the following is the purpose of sampling in PCM?
A. To convert an analog signal to a digital signal
B. To compress data
C. To encrypt data
D. To modulate the signal
Correct Answer:
A
Chapter: 68
Q862:
Sampling rate refers to the _______ at which samples are taken from the continuous signal.
A. frequency
B. amplitude
C. phase
D. distance
Correct Answer:
A
Chapter: 68
Q863:
Which of the following determines the frequency of sampling in Pulse Code Modulation?
A. Sampling theorem
B. Signal frequency
C. Signal amplitude
D. Signal strength
Correct Answer:
A
Chapter: 68
Q864:
What is the relationship between the sampling rate and the Nyquist frequency?
A. The sampling rate must be at least twice the Nyquist frequency.
B. The sampling rate should be less than the Nyquist frequency.
C. The sampling rate equals the Nyquist frequency.
D. There is no relationship.
Correct Answer:
A
Chapter: 68
Q865:
Sampling in Pulse Code Modulation helps to convert an _______ signal into a discrete signal.
A. analog
B. digital
C. encrypted
D. encoded
Correct Answer:
A
Chapter: 68
Q866:
Which of the following is true about the sampling process in Pulse Code Modulation?
A. The signal is continuously measured at a constant rate.
B. The signal is sampled at random intervals.
C. The signal is only measured once.
D. None of the above
Correct Answer:
A
Chapter: 69
Q867:
In Pulse Code Modulation (PCM), the process of quantization refers to _______.
A. approximating the amplitude of the signal to the nearest value
B. encoding the signal into digital form
C. sampling the signal at intervals
D. decoding the signal into its original form
Correct Answer:
A
Chapter: 69
Q868:
Quantization in PCM is used to convert _______ values into discrete levels.
A. analog
B. digital
C. integer
D. continuous
Correct Answer:
A
Chapter: 69
Q869:
The purpose of quantization in PCM is to reduce the _______ of the signal.
A. frequency
B. amplitude
C. complexity
D. precision
Correct Answer:
B
Chapter: 69
Q870:
Quantization involves mapping a continuous range of values into _______.
A. a finite set of discrete levels
B. an infinite set of values
C. a set of digital signals
D. none of the above
Correct Answer:
A
Chapter: 69
Q871:
Which of the following is the result of quantization in PCM?
A. The signal is represented with finite values.
B. The signal remains continuous.
C. The signal is modulated.
D. The signal becomes analog.
Correct Answer:
A
Chapter: 69
Q872:
The error introduced by quantization is known as _______.
A. quantization noise
B. aliasing
C. error distortion
D. sampling noise
Correct Answer:
A
Chapter: 69
Q873:
Which of the following factors determines the accuracy of quantization in PCM?
A. Number of quantization levels
B. Signal amplitude
C. Sampling rate
D. Signal frequency
Correct Answer:
A
Chapter: 69
Q874:
In Pulse Code Modulation, quantization error occurs due to _______.
A. rounding the continuous signal value to a discrete level
B. amplifying the signal
C. encoding the signal at a low rate
D. decoding the signal into continuous form
Correct Answer:
A
Chapter: 69
Q875:
Which of the following is a potential effect of quantization in PCM?
A. Quantization error
B. Sampling loss
C. Signal aliasing
D. Noise distortion
Correct Answer:
A
Chapter: 69
Q876:
The process of quantization is typically followed by _______ in PCM.
A. sampling
B. encoding
C. decoding
D. amplification
Correct Answer:
B
Chapter: 69
Q877:
Which of the following best describes the role of quantization in PCM?
A. To reduce the bandwidth of the signal
B. To convert the analog signal into a digital representation
C. To modulate the signal for transmission
D. To sample the analog signal
Correct Answer:
D
Chapter: 70
Q878:
In Pulse Code Modulation (PCM), the third step after sampling and quantization is _______.
A. Modulation
B. Encoding
C. Decoding
D. Compression
Correct Answer:
B
Chapter: 70
Q879:
The encoding step in PCM involves converting quantized values into _______.
A. analog signals
B. digital signals
C. continuous signals
D. amplitude levels
Correct Answer:
B
Chapter: 70
Q880:
Which of the following best describes the encoding process in PCM?
A. Converting the signal into digital form
B. Converting the signal into analog form
C. Modulating the signal for transmission
D. Compressing the signal for storage
Correct Answer:
A