Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 44
Q581:
Modulation helps broadband transmission by allowing the use of _______ channels.
A. bandpass
B. low-pass
C. high-pass
D. narrow-band
Correct Answer:
A
Chapter: 44
Q582:
The purpose of modulation in broadband transmission is to make the signal compatible with _______ channels.
A. bandpass
B. baseband
C. low-pass
D. analog
Correct Answer:
A
Chapter: 44
Q583:
What is the main advantage of using a bandpass channel in broadband transmission?
A. More available bandwidth
B. More signal loss
C. More complexity
D. Reduced signal quality
Correct Answer:
A
Chapter: 44
Q584:
Which of the following is true about broadband transmission?
A. It uses modulation for better bandwidth usage
B. It only uses digital signals
C. It uses baseband transmission for signals
D. It does not require modulation
Correct Answer:
A
Chapter: 44
Q585:
Broadband transmission is often used to transmit signals because it allows for _______ channels.
A. bandpass
B. low-pass
C. analog-only
D. high-pass
Correct Answer:
A
Chapter: 45
Q586:
What is the primary cause of transmission impairment in signals?
A. Attenuation
B. Amplification
C. Noise
D. Distortion
Correct Answer:
A
Chapter: 45
Q587:
Which of the following is not a cause of transmission impairment?
A. Attenuation
B. Noise
C. Heat
D. Distortion
Correct Answer:
C
Chapter: 45
Q588:
What happens to a signal as it travels through a transmission medium?
A. It remains unchanged
B. It amplifies in strength
C. It loses some of its energy
D. It becomes digital
Correct Answer:
C
Chapter: 45
Q589:
Attenuation refers to the _______ of energy as a signal travels through a medium.
A. gain
B. loss
C. reflection
D. transformation
Correct Answer:
B
Chapter: 45
Q590:
Which device is used to compensate for signal attenuation?
A. Amplifier
B. Oscillator
C. Filter
D. Modulator
Correct Answer:
A
Chapter: 45
Q591:
What does the decibel (dB) scale measure in relation to signal strength?
A. Frequency
B. Loss of energy
C. Power change
D. Signal quality
Correct Answer:
C
Chapter: 45
Q592:
If the signal power is reduced to half, the attenuation in dB would be _______?
A. −3 dB
B. +3 dB
C. 0 dB
D. −10 dB
Correct Answer:
A
Chapter: 45
Q593:
What is the formula to calculate decibels when the power is measured in milliwatts (dBm)?
A. dBm = 10 log10 Pm
B. dBm = 10 Pm
C. dBm = 20 log Pm
D. dBm = 10 Pm
Correct Answer:
A
Chapter: 45
Q594:
If the power of a signal is reduced by 3 dB, what happens to its strength?
A. It increases
B. It remains the same
C. It is halved
D. It is doubled
Correct Answer:
C
Chapter: 45
Q595:
In Example 3.26, if the power is reduced to half, the attenuation is calculated as _______?
A. −3 dB
B. +3 dB
C. 0 dB
D. −10 dB
Correct Answer:
A
Chapter: 45
Q596:
How is the loss of power measured in a transmission medium when using decibels?
A. dBm = 10 log10 Pm
B. dB = 10 log10 P
C. dBm = Pm / 10
D. dB = Pm * 10
Correct Answer:
B
Chapter: 45
Q597:
In Example 3.29, if the dBm value is −30, what is the power of the signal in milliwatts?
A. 0.001 mW
B. 1 mW
C. 0.0001 mW
D. 10 mW
Correct Answer:
A
Chapter: 45
Q598:
The relationship between attenuation and amplification in decibels is such that _______.
A. decibels can be added or subtracted
B. they cannot be calculated together
C. amplification is always greater
D. attenuation and amplification cannot mix
Correct Answer:
A
Chapter: 45
Q599:
In Example 3.27, if the signal's power is increased by 10 times, what happens to the signal?
A. The power is halved
B. The power is multiplied by 10
C. The power remains the same
D. The power is quadrupled
Correct Answer:
B
Chapter: 45
Q600:
When measuring signal strength in decibels, the calculation of dBm is done by using the formula _______.
A. dBm = 10 log10 Pm
B. dBm = 20 log10 P
C. dBm = Pm * 10
D. dBm = log10 Pm
Correct Answer:
A