Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
Q601: In Example 3.28, when adding decibel measurements, it shows the effect of _______ in the transmission.
- A: attenuation and amplification
- B: noise and interference
- C: only signal gain
- D: signal conversion to analog
View Answer
A
Q602: What unit is used to measure signal strength?
- A: Watt
- B: Volt
- C: Decibel (dB)
- D: Ampere
View Answer
C
Q603: When a signal is attenuated, the decibel value is _______.
- A: Positive
- B: Negative
- C: Zero
- D: Unchanged
View Answer
B
Q604: If the signal power is reduced to one-half, what is the attenuation in decibels?
- A: +3 dB
- B: −3 dB
- C: 0 dB
- D: −10 dB
View Answer
B
Q605: If the signal power is increased 10 times, the amplification in decibels is _______.
- A: +3 dB
- B: −3 dB
- C: +10 dB
- D: −10 dB
View Answer
C
Q606: The formula to calculate attenuation in decibels is _______.
- A: dB = 10 log10 P
- B: dB = 20 log10 P
- C: dB = 10 log10 (P2/P1)
- D: dB = P2 - P1
View Answer
C
Q607: What is the gain of a signal if its power is increased 10 times?
- A: 3 dB
- B: 10 dB
- C: 1 dB
- D: 100 dB
View Answer
B
Q608: The decibel value for a signal's amplification can be calculated as _______.
- A: 10 log10 (P2/P1)
- B: 10 log10 P
- C: P2/P1
- D: 20 log10 (P2/P1)
View Answer
A
Q609: If the signal's power is halved, the attenuation in decibels would be _______.
- A: 0 dB
- B: −3 dB
- C: −6 dB
- D: −10 dB
View Answer
B
Q610: In Example 3.26, the attenuation (loss of power) is calculated using the formula _______.
- A: dB = 10 log10 (P2/P1)
- B: dB = P2 / P1
- C: dB = 20 log10 (P2 / P1)
- D: dB = 10 log P1
View Answer
A