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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 22
26.
On a smooth surface, the line of sight distance between transmitting antenna (height ht metres) and receiving antenna (height hr metres) is about
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Which stage generates RF carrier?
Amplifier
Oscillator
Power supply
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
In Modulation, "carrier" is
resultant wave
speech voltage to be transmitted
voltage with constant frequency, phase or amplitude
voltage for which frequency, phase or amplitude is varied
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Which one of the following blocks is not common in both AM and FM receivers?
RF amplifier
Mixer
IF amplifier
Slope detector
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
If the variance σx2 of d(n) = x(n) - x(n - 1) is one-tenth the variance σx2 of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function Rxx(x)/σx2 at k = 1 is
0.95
0.90
0.10
0.05
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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