Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
Q611: When a signal experiences amplification, the decibel value will be _______.
- A: Negative
- B: Positive
- C: Zero
- D: Unchanged
View Answer
B
Q612: The signal strength in decibels is usually calculated when the power is measured in _______.
- A: Watts
- B: Joules
- C: Milliwatts (dBm)
- D: Amperes
View Answer
C
Q613: In Example 3.27, when the signal power increases by 10 times, the amplification in dB is _______.
- A: +3 dB
- B: +10 dB
- C: +20 dB
- D: 0 dB
View Answer
B
Q614: If a signal’s power changes from P1 to P2 and the decibel value is calculated, it indicates the _______ between P1 and P2.
- A: ratio
- B: frequency
- C: amplitude
- D: phase
View Answer
A
Q615: The decibel (dB) scale is used for measuring _______ in a signal.
- A: Resistance
- B: Power change
- C: Frequency change
- D: Signal amplitude
View Answer
B
Q616: If the signal's power is reduced, the decibel value will be _______ and the attenuation will be _______.
- A: Positive, Positive
- B: Negative, Negative
- C: Positive, Negative
- D: Negative, Positive
View Answer
D
Q617: What does distortion in a signal refer to?
- A: Change in signal frequency
- B: Change in signal shape or form
- C: Loss of signal power
- D: Increase in signal intensity
View Answer
B
Q618: Distortion can occur in a composite signal made of _______.
- A: A single frequency
- B: Different frequencies
- C: A pure tone
- D: A high-frequency signal
View Answer
B
Q619: The cause of distortion is the _______ in propagation speed for each signal component.
- A: Difference
- B: Equality
- C: Similarity
- D: Invariance
View Answer
A
Q620: Differences in delay of signal components can create a difference in _______.
- A: Voltage
- B: Phase
- C: Frequency
- D: Amplitude
View Answer
B