In this section of Data Communication and Networking – Data and Signals MCQ (Multiple Choice) Based Questions and Answers,it cover the below lists of topic, All the Multiple Choice Question and Answer (MCQs) have been compiled from the books of Data Communication and Networking by The well known author behrouz A forouzan.
- Data and signal MCQs.
- Amplitude, frequency, and phase MCQs.
- Time-domain graph plots MCQs.
- Frequency-domain graph plots MCQs.
- Spectrum ,bandwidth of a signa MCQs.
- Bit rate (number of bits per second) and bit interval (duration of 1 bit) MCQs.
- Nyquist formula MCQs.
- Shannon capacity MCQs.
- Attenuation, distortion, and noise MCQs.
- Throughput, propagation speed, and propagation time ,wavelength of a frequency MCQs.
1. Before data can be transmitted, they must be transformed to ________.
- periodic signals
- electromagnetic signals
- aperiodic signals
- low-frequency sine waves
2. A periodic signal completes one cycle in 0.001 s. What is the frequency?
- 1 Hz
- 100 Hz
- 1 KHz
- 1 MHz
3. In a frequency-domain plot, the horizontal axis measures the ________.
- peak amplitude
- frequency
- phase
- slope
4. In a time-domain plot, the horizontal axis is a measure of ________.
- signal amplitude
- frequency
- phase
- time
5. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?
- 5 KHz
- 10 KHz
- 47 KHz
- 57 KHz
6. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?
- 4 MHz
- 1 KHz
- 3 MHz
- none of the above
7. As frequency increases, the period ________.
- decreases
- increases
- remains the same
- doubles
8. Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
- one-half
- twice
- the same as
- indeterminate from
9. A sine wave is ________.
- periodic and continuous
- aperiodic and continuous
- periodic and discrete
- aperiodic and discrete
10. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.
- 2
- 1
- -2
- between -2 and 2
11. A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.
- P2 is zero
- P2 equals P1
- P2 is much larger than P1
- P2 is much smaller than P1
12. ________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.
- Attenuation
- Distortion
- Noise
- Decibel
13. ________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.
- Attenuation
- Distortion
- Noise
- Decibel
14. ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
- Attenuation
- Distortion
- Noise
- Decibel
15. When propagation speed is multiplied by propagation time, we get the ________.
- throughput
- wavelength of the signal
- distortion factor
- distance a signal or bit has traveled
16. Data can be ________.
- analog
- digital
- (a) or (b)
- none of the above
17. _______ data are continuous and take continuous values.
- analog
- digital
- (a) or (b)
- none of the above
18. _______ data have discrete states and take discrete values.
- Analog
- Digital
- (a) or (b)
- None of the above
19. Signals can be ________
- analog
- digital
- either (a) or (b)
- neither (a) nor (b)
20. _____ signals can have an infinite number of values in a range.
- Analog
- Digital
- (a) or (b)
- None of the above
21. _______ signals can have only a limited number of values.
- Analog
- Digital
- (a) or (b)
- None of the above
22. Frequency and period are ______
- inverse of each other
- proportional to each other
- the same
- none of the above
23. _______is the rate of change with respect to time.
- Amplitude
- Time
- Frequency
- Voltage
24. _______ describes the position of the waveform relative to time 0.
- Frequency
- Phase
- Amplitude
- Voltage
25. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.
- time; frequency
- frequency; time
- time; phase
- phase; time
26. A _________ sine wave is not useful in data communications; we need to send a _______ signal.
- composite; single-frequency
- single-frequency; composite
- single-frequency; double-frequency
- none of the above
27. The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal
- frequency
- period
- bandwidth
- amplitude
28. A(n)_________ signal is a composite analog signal with an infinite bandwidth.
- digital
- analog
- either (a) or (b)
- neither (a) nor (b)
29. Baseband transmission of a digital signal is possible only if we have a ____ channel
- low-pass
- bandpass
- low rate
- high rate
30. If the available channel is a ____ channel, we cannot send a digital signal directly to the channel
- low-pass
- bandpass
- low rate
- high rate