 # Forouzan: MCQ in Data and Signals

(Last Updated On: April 20, 2018)
This is the Multiple Choice Questions in Chapter 3: Data and Signals from the book Data Communications and Networking by Behrouz A. Forouzan. If you are looking for a reviewer in datacom topic in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

If you are not ready to take the exam, have a short review for this topic. Data and Signals summary

#### Begin and Good luck!

Choose the letter of the best answer in each questions.

1. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.

• A)   2
• B)   1
• C)   -2
• D)   between -2 and 2

Solution:

2. _________ can impair a signal.

• A)   Noise
• B)   Attenuation
• C)   Distortion
• D)   All of the above

Solution:

3. ________is the rate of change with respect to time.

• A)   Time
• B)   Frequency
• C)   Amplitude
• D)   Voltage

Solution:

4. 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 ________.

• A)   P2 equals P1
• B)   P2 is zero
• C)   P2 is much larger than P1
• D)   P2 is much smaller than P1

Solution:

5. Baseband transmission of a digital signal is possible only if we have a ____ channel.

• A)   bandpass
• B)   low-pass
• C)   high rate
• D)   low rate

Solution:

6. ________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.

• A)   Distortion
• B)   Attenuation
• C)   Noise
• D)   Decibel

Solution:

7. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

• A)   time; phase
• B)   frequency; time
• C)   time; frequency
• D)   phase; time

Solution:

8. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?

• A)   5 KHz
• B)   47 KHz
• C)   57 KHz
• D)   10 KHz

Solution:

9. In a time-domain plot, the horizontal axis is a measure of ________.

• A)   phase
• B)   signal amplitude
• C)   frequency
• D)   time

Solution:

10. _______ data are continuous and take continuous values.

• A)   digital
• B)   analog
• C)   (a) or (b)
• D)   none of the above

Solution:

11. Frequency and period are ______.

• A)   proportional to each other
• B)   inverse of each other
• C)   the same
• D)   none of the above

Solution:

12. When propagation speed is multiplied by propagation time, we get the ________.

• A)   wavelength of the signal
• B)   throughput
• C)   distance a signal or bit has traveled
• D)   distortion factor

Solution:

13. A _________ sine wave is not useful in data communications; we need to send a _______ signal.

• A)   single-frequency; composite
• B)   composite; single-frequency This is the correct answer.
• C)   single-frequency; double-frequency
• D)   none of the above

Solution:

14. The _________ product defines the number of bits that can fill the link.

• A)   delay-amplitude
• B)   frequency-amplitude
• C)   bandwidth-period
• D)   bandwidth-delay

Solution:

15. _______ signals can have only a limited number of values.

• A)   Digital
• B)   Analog
• C)   (a) or (b)
• D)   None of the above

Solution:

16. Before data can be transmitted, they must be transformed to ________.

• A)   periodic signals
• B)   electromagnetic signals
• C)   aperiodic signals
• D)   low-frequency sine waves

Solution:

17. Data can be ________.

• A)   digital
• B)   analog
• C)   (a) or (b)
• D)   none of the above

Solution:

18. ________ 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.

• A)   Noise
• B)   Distortion
• C)   Attenuation
• D)   Decibel

Solution:

19. Signals can be ________.

• A)   digital
• B)   analog
• C)   either (a) or (b)
• D)   neither (a) nor (b)

Solution:

20. A sine wave is ________.

• A)   periodic and discrete
• B)   aperiodic and discrete
• C)   periodic and continuous
• D)   aperiodic and continuous

Solution:

21. _______ data have discrete states and take discrete values.

• A)   Analog
• B)   Digital
• C)   (a) or (b)
• D)   None of the above

Solution:

22. For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.

• A)   noiseless
• B)   noisy
• C)   low-pass
• D)   bandpass

Solution:

23. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?

• A)   1 KHz
• B)   3 MHz
• C)   4 MHz
• D)   none of the above

Solution:

24. _____ signals can have an infinite number of values in a range.

• A)   Analog
• B)   Digital
• C)   (a) or (b)
• D)   None of the above

Solution:

25. A(n)_________ signal is a composite analog signal with an infinite bandwidth.

• A)   digital
• B)   analog
• C)   either (a) or (b)
• D)   neither (a) nor (b)

Solution:

26. A periodic signal completes one cycle in 0.001 s. What is the frequency?

• A)   1 Hz
• B)   100 Hz
• C)   1 KHz
• D)   1 MHz

Solution:

27. The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.

• A)   period
• B)   bandwidth
• C)   frequency
• D)   amplitude

Solution:

28. ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.

• A)   Noise
• B)   Distortion
• C)   Attenuation
• D)   Decibel

Solution:

29. _______ describes the position of the waveform relative to time 0.

• A)   Amplitude
• B)   Phase
• C)   Frequency
• D)   Voltage

Solution:

30. 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.

• A)   one-half
• B)   twice
• C)   the same as
• D)   indeterminate from

Solution:

31. As frequency increases, the period ________.

• A)   increases
• B)   decreases
• C)   doubles
• D)   remains the same

Solution:

32. If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.

• A)   low-pass
• B)   low rate
• C)   bandpass
• D)   high rate

Solution:

33. For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.

• A)   low-pass
• B)   bandpass
• C)   noisy
• D)   noiseless

Solution:

34. In a frequency-domain plot, the horizontal axis measures the ________.

• A)   phase
• B)   frequency
• C)   slope
• D)   peak amplitude

Solution:

#### Complete List of Chapter Quiz in Data Communications and Networking 