1
GATE ECE 2004
+2
-0.6
A 1 mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through a cable that has 40 dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is
A
50 dB
B
30 dB
C
40 dB
D
60 dB
2
GATE ECE 2002
+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
3
GATE ECE 1992
+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.
A
1/2 and 2/3
B
1 and 4/3
C
1 and 2/3
D
2 and 4/3
4
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.
EXAM MAP
Medical
NEET