May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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68 Data Communications and Computer Networks
12. Amplitude modulation is a technique used
for
(a) Analog-to-digital conversion
(b) Digital-to-analog conversion
(c) Analog-to-analog conversion
(d) Digital-to-digital conversion
13. Which of the following factors of a carrier
frequency is varied in QAM?
(a) Frequency (b) Amplitude
(c) Phase (d) Both (b) and (c)
14. How many carrier frequencies are used in
BFSK?
(a) 2 (b) 1
(c) 0 (d) None of these
15. How many dots are present in the constellation
diagram of 8-QAM?
(a) 4
(b) 8
(c) 16
(d) None of these
Answers
1. (d) 2. (a) 3. (a) 4. (c) 5. (c) 6. (b) 7. (c) 8. (b)
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