Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 76
Q981:
In digital-to-analog conversion, which characteristic of the signal remains constant while the amplitude changes?
A. Frequency
B. Phase
C. Amplitude
D. Both frequency and phase
Correct Answer:
B
Chapter: 76
Q982:
What is the baud rate in an analog signal if the bit rate is 8000 bps and 1000 data elements are carried by each signal element?
A. 1000 baud
B. 8000 baud
C. 2000 baud
D. None of the above
Correct Answer:
A
Chapter: 76
Q983:
What does baud rate represent in digital-to-analog modulation?
A. The number of data bits transmitted per second
B. The number of signal elements transmitted per second
C. The frequency of the carrier signal
D. The speed of data encoding
Correct Answer:
B
Chapter: 76
Q984:
The baud rate in analog-to-digital conversion is _______ than or equal to the bit rate.
A. Less
B. Equal to
C. Greater
D. None of the above
Correct Answer:
B
Chapter: 76
Q985:
Which of the following factors determines the bandwidth required for digital-to-analog conversion?
A. Signal rate
B. Carrier signal
C. Amplitude of signal
D. All of the above
Correct Answer:
A
Chapter: 76
Q986:
In amplitude shift keying (ASK), which characteristic of the carrier signal is varied?
A. Frequency
B. Phase
C. Amplitude
D. None of the above
Correct Answer:
C
Chapter: 76
Q987:
Binary Amplitude Shift Keying (BASK) involves _______ of the carrier signal.
A. Varying its frequency
B. Varying its amplitude
C. Varying its phase
D. None of the above
Correct Answer:
B
Chapter: 76
Q988:
Which of the following methods is used to change the characteristics of an analog signal to represent digital data?
A. Amplitude shift keying
B. Frequency shift keying
C. Phase shift keying
D. All of the above
Correct Answer:
D
Chapter: 76
Q989:
Which of the following describes the process of digital-to-analog conversion?
A. Amplitude, frequency, and phase of the analog signal are varied to represent digital data.
B. The signal is directly transmitted without modification.
C. Only frequency is adjusted to represent digital data.
D. None of the above
Correct Answer:
A
Chapter: 76
Q990:
If the bit rate is 8000 bps and the baud rate is 1000 baud, how many data elements are carried by each signal element?
A. 8
B. 4
C. 2
D. 1
Correct Answer:
A
Chapter: 76
Q991:
What happens to the amplitude in Binary Amplitude Shift Keying (BASK)?
A. It remains constant
B. It is varied based on digital data
C. It changes the phase of the signal
D. None of the above
Correct Answer:
B
Chapter: 77
Q992:
Which process involves changing one characteristic of an analog signal based on digital data?
A. Digital-to-analog conversion
B. Analog-to-digital conversion
C. Signal amplification
D. Data encoding
Correct Answer:
A
Chapter: 77
Q993:
Which of the following is not a characteristic of a sine wave?
A. Amplitude
B. Frequency
C. Phase
D. Bit rate
Correct Answer:
D
Chapter: 77
Q994:
What are the three main characteristics of a sine wave?
A. Amplitude, Bit rate, Frequency
B. Frequency, Amplitude, Phase
C. Bit rate, Phase, Frequency
D. Amplitude, Phase, Data rate
Correct Answer:
B
Chapter: 77
Q995:
In digital-to-analog conversion, which characteristic of the signal can be varied?
A. Amplitude
B. Frequency
C. Phase
D. All of the above
Correct Answer:
D
Chapter: 77
Q996:
The process of changing the amplitude of the carrier signal while keeping frequency and phase constant is called _______.
A. Amplitude modulation
B. Amplitude shift keying
C. Phase shift keying
D. Frequency shift keying
Correct Answer:
B
Chapter: 77
Q997:
Which of the following remains constant in Binary Amplitude Shift Keying (BASK)?
A. Frequency and phase
B. Amplitude and frequency
C. Phase only
D. None of the above
Correct Answer:
A
Chapter: 77
Q998:
The method of varying the frequency of a carrier signal to represent digital data is called _______.
A. Frequency shift keying
B. Phase modulation
C. Amplitude modulation
D. Digital encoding
Correct Answer:
A
Chapter: 77
Q999:
In phase shift keying (PSK), which characteristic of the carrier signal is changed?
A. Frequency
B. Phase
C. Amplitude
D. All of the above
Correct Answer:
B
Chapter: 77
Q1000:
What is the purpose of digital-to-analog conversion?
A. To encode digital data as an analog signal
B. To amplify an analog signal
C. To compress a digital signal
D. To decode an analog signal
Correct Answer:
A