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Question

A stationary random process X(t) is applied to the circuit shown below:

If the mean value of the input process X(t) is 5, then the mean value of the output process Y(t) will be

A
5
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B
0.8
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C
0
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D
4
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Solution

The correct option is D 4
E[X(t)]=5

E[Y(t)]=H(0)E[X(t)]

H(0)H(s)s=0

H(s)= Transfer funciton of the given circuit

From the given circuit,
H(0)=4MΩ4MΩ+1MΩ=45=0.80

So, [Y(t)]=0.80×5=4

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