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)**”.

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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