This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Digital to Analog to Encoding / Modulation Techniques – Amplitude-shift keying (ASK)- Frequency-shift keying (FSK)- Phase-shift keying (PSK)- Quadrature Amplitude Modulation(QAM)”.

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1. The process of changing one of the characteristics of a carrier analog signal based on the information in a digital signal is called _______ conversion

  • analog-to-analog
  • analog-to-digital
  • digital-to-analog
  • digital-to-digital

2. In _______ the frequency of the carrier signal is varied based on the information in a digital signal

  • ASK
  • PSK
  • FSK
  • QAM

3. In _______ the amplitude of the carrier signal is varied based on the information in a digital signal.

  • ASK
  • PSK
  • FSK
  • QAM

4. In _______ the phase of the carrier signal is varied based on the information in a digital signal

  • ASK
  • PSK
  • FSK
  • QAM

5. In _______ the phase and amplitude of the carrier signal is varied based on the information in a digital signal.

  • ASK
  • PSK
  • FSK
  • QAM

6. Most modern modems use _______ for digital to analog modulation

  • ASK
  • PSK
  • FSK
  • QAM

7. _______ rate is the number of bits per second; _______ rate is the number of signal units per second

  • Baud; bit
  • Bit; baud
  • Baud; base
  • Base; baud

8. _______ rate is always less than or equal to _______ rate

  • Baud; bit
  • Bit; baud
  • Baud; base
  • Base; baud

9. If the bit rate is 1200 bps and there are 4 bits for each signal element, then the baud rate is _______.

  • 4800
  • 1200
  • 400
  • 300

10. If the baud rate is 1200 and there are 4 bits for each signal element, then the bit rate is _______

  • 4800
  • 1200
  • 400
  • 300

11. An ASK modulated signal has a bit rate of 2000 bps; the baud rate is _______

  • 2000
  • 1000
  • 4000
  • none of the above

12. A 2-PSK modulated signal has a bit rate of 2000 bps; the baud rate is _______

  • 2000
  • 1000
  • 4000
  • none of the above

13. A 4-PSK modulated signal has a bit rate of 2000 bps; the baud rate is _______.

  • 2000
  • 1000
  • 4000
  • none of the above

14. An 8-PSK modulated signal has a baud rate of 2000; the bit rate is _______ bps

  • 8000
  • 6000
  • 2000
  • 1000

15. An 8-QAM modulated signal has a baud rate of 2000; the bit rate is _______ bps

  • 8000
  • 6000
  • 2000
  • 1000

16. A 32-QAM modulated signal has a baud rate of 2000; the bit rate is _______ bps

  • 16000
  • 10000
  • 4000
  • 1000

17. A 128-QAM modulated signal has a baud rate of 2000; there are _______ bits per baud.

  • 2000
  • 1000
  • 7
  • 6

18. A 256-QAM modulated signal has a bit rate of 8000; there are _______ bits per baud

  • 8000
  • 4000
  • 8
  • 7

19. OOK is a type of _______ modulation.

  • ASK
  • PSK
  • FSK
  • QAM

20. The modulation technique most affected by noise is _______

  • ASK
  • PSK
  • FSK
  • QAM

21. For _______, the minimum bandwidth required for transmission is equal to the baud rate

  • ASK
  • PSK
  • FSK
  • a and b

22. The minimum bandwidth for an ASK modulated signal with a baud rate of 5000 is _______ Hz.

  • 1000
  • 2500
  • 5000
  • 10000

23. On a 16-QAM-constellation diagram, each constellation point represents a _______

  • dibit
  • tribit
  • quadbit
  • pentabit

24. In which type of modulation can the bit rate be four times the baud rate?

  • ASK
  • FSK
  • PSK
  • None of the above

25. In which type of modulation can the bit rate be three times the baud rate?

  • ASK
  • FSK
  • PSK
  • None of the above

26. In which type of modulation can the bit rate be half the baud rate?

  • ASK
  • FSK
  • PSK
  • None of the above

27. In _______ modulation, the bit rate is 8 times the baud rate

  • 8-QAM
  • 64-QAM
  • 256-QAM
  • None of the above

28. In _______ modulation, the baud rate is 1/4 times the bit rate.

  • 4-QAM
  • 2-PSK
  • 4-PSK
  • None of the above

29. In a dibit modulation, the number of points in the constellation is _______

  • 2
  • 4
  • 8
  • None of the above

30. In a tribit modulation, the number of points in the constellation is _______

  • 2
  • 4
  • 8
  • None of the above

31. A 4-PSK constellation is a _________ modulation

  • dibit
  • tribit
  • quadbit
  • None of the above

32. An 8-QAM constellation is a _________ modulation

  • dibit
  • tribit
  • quadbit
  • None of the above

33. The number of points in the constellation of an 8-PSK modulation is _______ the number of points for an 8-QAM

  • greater than
  • less than
  • equal to
  • None of the above

34. If the baud rate for modulation scheme A is two times the baud rate for modulation scheme B, the required bandwidth for scheme A is ___________ the one for scheme B

  • more than
  • less than
  • equal to
  • we cannot tell

35. If the bit rate for modulation scheme A is two times the bit rate for modulation scheme B, the required bandwidth for scheme A is ___________ the one for scheme B.

  • more than
  • less than
  • equal to
  • we cannot tell
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