Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 48
Q641:
If the power of the signal is 10 mW and the noise is 1 μW, the SNR can be converted to SNRdB by using the formula _______.
A. SNRdB = 10 * log10(SNR)
B. SNRdB = log10(SNR)
C. SNRdB = 20 * log10(SNR)
D. SNRdB = log2(SNR)
Correct Answer:
A
Chapter: 49
Q642:
The data rate over a channel depends on which of the following factors?
A. Bandwidth, signal level, and noise
B. Only signal level and noise
C. Only bandwidth and noise
D. Only bandwidth and signal level
Correct Answer:
A
Chapter: 49
Q643:
The theoretical formula developed by Nyquist calculates the data rate for a _______ channel.
A. Noisy
B. Noiseless
C. Low-bandwidth
D. High-bandwidth
Correct Answer:
B
Chapter: 49
Q644:
The Shannon capacity formula is used to calculate the data rate for a _______ channel.
A. Noisy
B. Noiseless
C. Low-bandwidth
D. High-bandwidth
Correct Answer:
A
Chapter: 49
Q645:
In a noiseless channel, what is the theoretical maximum bit rate determined by?
A. Nyquist Rate
B. Shannon Capacity
C. Bandwidth Factor
D. Signal to Noise Ratio
Correct Answer:
A
Chapter: 49
Q646:
The Nyquist rate formula calculates the maximum bit rate for a noiseless channel by considering _______.
A. Signal levels and bandwidth
B. Noise and bandwidth
C. Signal frequency and noise
D. Only bandwidth
Correct Answer:
A
Chapter: 49
Q647:
In the example with a bandwidth of 3000 Hz and two signal levels, the maximum bit rate can be calculated as _______.
A. 6000 bits per second
B. 3000 bits per second
C. 1500 bits per second
D. 12000 bits per second
Correct Answer:
A
Chapter: 49
Q648:
If a signal has four signal levels and the bandwidth of the channel is 3000 Hz, the maximum bit rate can be calculated as _______.
A. 6000 bits per second
B. 12000 bits per second
C. 3000 bits per second
D. 24000 bits per second
Correct Answer:
B
Chapter: 49
Q649:
If a noisy channel has a bandwidth of 5000 Hz and a signal-to-noise ratio (SNR) of 30 dB, the Shannon capacity can be calculated using _______.
A. Nyquist formula
B. Shannon formula
C. Both Nyquist and Shannon formulas
D. Bandwidth and signal level
Correct Answer:
B
Chapter: 49
Q650:
The Shannon capacity formula considers which of the following factors?
A. Bandwidth and signal-to-noise ratio
B. Only bandwidth
C. Only signal levels
D. Only noise level
Correct Answer:
A
Chapter: 49
Q651:
The Nyquist formula assumes _______ levels of signal.
A. Two or more
B. Four or more
C. Only one level
D. Any number of levels
Correct Answer:
A
Chapter: 49
Q652:
In a channel with a bandwidth of 3000 Hz and four signal levels, what is the maximum bit rate according to the Nyquist formula?
A. 12000 bits per second
B. 6000 bits per second
C. 3000 bits per second
D. 1500 bits per second
Correct Answer:
A
Chapter: 49
Q653:
According to Shannon's formula, if the noise is reduced to zero, the capacity of the channel becomes _______.
A. Infinite
B. Zero
C. Limited
D. Negligible
Correct Answer:
A
Chapter: 49
Q654:
The Nyquist rate formula is ideal for calculating data rate in a _______ channel.
A. Noiseless
B. Noisy
C. Low-frequency
D. High-frequency
Correct Answer:
A
Chapter: 49
Q655:
If the bandwidth of a channel is doubled, what happens to the maximum data rate in a noiseless channel according to the Nyquist formula?
A. It doubles
B. It triples
C. It stays the same
D. It halves
Correct Answer:
A
Chapter: 50
Q656:
Who introduced the formula to determine the theoretical highest data rate for a noisy channel?
A. Nyquist
B. Claude Shannon
C. Albert Einstein
D. Thomas Edison
Correct Answer:
B
Chapter: 50
Q657:
What does Shannon's formula determine in a noisy channel?
A. The signal strength
B. The theoretical highest data rate
C. The maximum signal-to-noise ratio
D. The number of signal levels
Correct Answer:
B
Chapter: 50
Q658:
If the signal-to-noise ratio is almost zero, the capacity of the channel will be _______.
A. Infinite
B. Zero
C. Limited to bandwidth
D. Dependent on signal level
Correct Answer:
B
Chapter: 50
Q659:
In practice, which two formulas are used to determine the limits and signal levels of a channel?
A. Nyquist and Shannon
B. Nyquist and SNR formula
C. Shannon and SNR formula
D. Shannon and Bandwidth formula
Correct Answer:
A
Chapter: 50
Q660:
What happens to the channel capacity when the signal-to-noise ratio (SNR) is very low?
A. It becomes very high
B. It becomes zero
C. It increases dramatically
D. It stays constant
Correct Answer:
B