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

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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