Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 47
Q621:
The delay of signal components can cause differences in _______ when it is not the same for all components.
A. Phase
B. Frequency
C. Speed
D. Amplitude
Correct Answer:
A
Chapter: 47
Q622:
What happens when the delay of signal components is not exactly the same?
A. Distortion
B. Amplification
C. Attenuation
D. Signal clarity
Correct Answer:
A
Chapter: 47
Q623:
In distortion, the _______ of the signal is altered as it passes through the transmission medium.
A. Frequency
B. Shape or form
C. Intensity
D. Phase shift
Correct Answer:
B
Chapter: 47
Q624:
Which of the following is a result of distortion in composite signals?
A. All components arrive at the same time
B. Delay differences between components
C. Amplification of certain frequencies
D. Decrease in signal strength
Correct Answer:
B
Chapter: 47
Q625:
Distortion in signals is often caused by differences in _______.
A. Propagation speed
B. Amplification factors
C. Signal power
D. Signal noise
Correct Answer:
A
Chapter: 47
Q626:
A difference in the delay of signal components can result in a change in the _______ of the signal.
A. Phase
B. Frequency
C. Amplitude
D. Duration
Correct Answer:
A
Chapter: 47
Q627:
The _______ of the signal is changed when distortion occurs during transmission.
A. Shape or form
B. Frequency
C. Amplitude
D. Propagation speed
Correct Answer:
A
Chapter: 47
Q628:
Distortion is likely to occur when the signal components have different _______ through the transmission medium.
A. Propagation speeds
B. Amplitudes
C. Frequencies
D. Durations
Correct Answer:
A
Chapter: 48
Q629:
What is one of the causes of impairment in signals?
A. Attenuation
B. Noise
C. Signal amplification
D. Reflection
Correct Answer:
B
Chapter: 48
Q630:
Thermal noise is caused by the random motion of _______.
A. Electrons in a wire
B. Magnetic fields
C. Radio waves
D. Acoustic signals
Correct Answer:
A
Chapter: 48
Q631:
What is Crosstalk in terms of noise?
A. Noise from external devices
B. Effect of one wire on another
C. Noise caused by poor signal shielding
D. Interference from radio signals
Correct Answer:
B
Chapter: 48
Q632:
Which of the following is a type of noise?
A. Thermal noise
B. Water noise
C. Mechanical noise
D. All of the above
Correct Answer:
A
Chapter: 48
Q633:
Signal to Noise Ratio (SNR) is used to find the theoretical _______ of a signal.
A. Frequency range
B. Bit rate limit
C. Power output
D. Voltage level
Correct Answer:
B
Chapter: 48
Q634:
The power of the signal is 10 mW and the power of the noise is 1 μW. What is the formula for calculating SNR?
A. SNR = P_signal / P_noise
B. SNR = P_noise / P_signal
C. SNR = P_signal + P_noise
D. SNR = (P_signal + P_noise) / 2
Correct Answer:
A
Chapter: 48
Q635:
In the example where the power of the signal is 10 mW and the noise is 1 μW, the SNR can be calculated as _______.
A. 1000
B. 0.1
C. 1000000
D. 100
Correct Answer:
A
Chapter: 48
Q636:
What is the typical unit used to represent the Signal to Noise Ratio (SNR)?
A. Decibel (dB)
B. Watts (W)
C. Hertz (Hz)
D. Amperes (A)
Correct Answer:
A
Chapter: 48
Q637:
What type of noise is caused by random electron movement in a wire?
A. Thermal noise
B. Induced noise
C. Crosstalk
D. Impulse noise
Correct Answer:
A
Chapter: 48
Q638:
Signal to Noise Ratio (SNR) in decibels is represented as _______.
A. SNRdB = 10 * log10(SNR)
B. SNRdB = log10(SNR)
C. SNRdB = 20 * log10(SNR)
D. SNRdB = log2(SNR)
Correct Answer:
A
Chapter: 48
Q639:
Which noise type affects signals when one wire influences another wire nearby?
A. Induced noise
B. Crosstalk
C. Thermal noise
D. Impulse noise
Correct Answer:
B
Chapter: 48
Q640:
The power of a signal is 10 mW and the power of the noise is 1 μW. The SNR in this case is calculated as _______.
A. 1000
B. 1000000
C. 1
D. 0.1
Correct Answer:
A