Data Communication and Networking – Digital to Analog Encoding / Modulation Techniques – ASK / FSK / PSK / QAM MCQs

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

19. OOK is a type of _______ modulation.

20. The modulation technique most affected by noise is _______

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

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

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

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

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

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

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

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

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

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

31. A 4-PSK constellation is a _________ modulation

32. An 8-QAM constellation is a _________ modulation

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

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

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.