1
GATE ECE 2002
MCQ (Single Correct Answer)
+2
-0.6
If the variance $$\sigma _d^2$$ of d(n) = x(n - 1) is one-tenth the variance $$\sigma _x^2$$ of a stationary zero-mean discrete-time signal x(n), then the normalized autocorrelation function $${R_{xx}}\,(k)\,/\,\,\sigma _x^2\,at\,\,k\,\, = \,1$$ is
A
0.95
B
0.90
C
0.10
D
0.05
2
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
For a random variable 'X' following the probability density function, p (x), shown in figure, the mean and the variance are, respectively. GATE ECE 1992 Communications - Random Signals and Noise Question 13 English
A
1/2 and 2/3
B
1 and 4/3
C
1 and 2/3
D
2 and 4/3
3
GATE ECE 1991
Fill in the Blanks
+2
-0
Two resistors $$\,{R_1}$$ and $$\,{R_2}$$ (in ohms) at temperatures $${T_1}{}^ \circ K$$ and $${T_2}{}^ \circ K$$ respectively, are connected in series. Their equivalent noise temperature is.
4
GATE ECE 1989
MCQ (Single Correct Answer)
+2
-0.6
Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectifier output will be:
A
Zero
B
N/2
C
$$N/\sqrt 2 $$
D
N
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