Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
B
Q632: Which of the following is a type of noise?
- A: Thermal noise
- B: Water noise
- C: Mechanical noise
- D: All of the above
View Answer
A
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
View Answer
B
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
View Answer
A
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
View Answer
A
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)
View Answer
A
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
View Answer
A
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)
View Answer
A
Q639: Which noise type affects signals when one wire influences another wire nearby?
- A: Induced noise
- B: Crosstalk
- C: Thermal noise
- D: Impulse noise
View Answer
B
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
View Answer
A