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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 21
1.
In a communication system, a process in which statistical averages and time averages are equal is called as,
stationary
ergodic
Gaussian
BIBO stable
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
The materials not having negative temperature coefficient of resistivity are
metals
semiconductors
insulators
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
The input to a binary communication system, denoted by a random variable x, takes on one of the two values 0 or 1 with probabilities and . The behaviour of the communication system is modelled by
P(Y = 1 |x = 1|) = and P(Y = 0|x = 0) =
Find P(Y = 1)
1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Consider an AM system using a square law detector as shown in figure.

XC(t) = AC[1 + u x (t)] cos ωct, |ux(t)| << 1
The signal power at the output is :
A2Cu2 E[x2(t)]
A2Cu2 E(x)
None
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Thermal noise is passed through an ideal low-pass filter having cut-off at fc = ωHz. The auto correlation value of the noise at the output of the filter is given as
Triangular function over the range
Gaussian over the range -∞ ≤ t ≤ ∞
A Delta function at t = 0
Sin c function over the range - ∞ ≤ t ≤ ∞
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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