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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 19
36.
The power consumption of a present day colour TV receiver is about
8 W
80 W
200 W
400 W
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Consider the following differences between QPSK and MSK
  1. The side lobes in MSK are relatively much smaller in comparison to the main lobe
  2. The spectrum of MSK has a main centre lobe which is 1.5 times as wide as the main lobe of QPSK
  3. The waveforms of both MSK and QPSK exhibit phase continuity
Which of the above statements are correct?
1 only
1 and 2 only
1, 2 and 3
2 and 3 only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
As per Hartley law
redundancy is essential
it is necessary to use only binary codes
maximum rate of information transmission depends on the channel bandwidth
the maximum rate of information depends on depth of modulation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
The speeds used in recording audio programs in house hold recorders are
38 cm/s and 9.5 cm/s
38 cm/s and 19 cm/s
9.5 cm/s and 4.75 cm/s
38 cm/s and 4.75 cm/s
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
During transmission over a communication channel, bit errors occur independently with probability P. If a block of n bits is transmitted, the probability of at most one bit error is equal to
1 - (1 - P)n
P + (n - 1) (1 - P)
nP (1 - P)n - 1
(1 - P)n + nP (1 - P)n - 1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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