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Communications
Analog Communication Systems
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Digital Communication Systems
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Random Signals and Noise
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Fundamentals of Information Theory
Marks 1Marks 2
Noise In Digital Communication
Marks 1Marks 2
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1
GATE ECE 2007
MCQ (Single Correct Answer)
+1
-0.3
If E denotes expectation, the variance of a random variable X is given by
A
$$E\,\left[ {{X^2}} \right] - \,{E^2}\left[ X \right]$$
B
$$E\,\left[ {{X^2}} \right] + \,{E^2}\left[ X \right]$$
C
$$E\,\left[ {{X^2}} \right]$$
D
$${E^2}\left[ X \right]$$
2
GATE ECE 2001
MCQ (Single Correct Answer)
+1
-0.3
The PDF of a Gaussian random variable X is given by $${p_x}(x) = \,{1 \over {3\sqrt {2\pi } }}\,\exp \,[ - \,{(x - 4)^2}/18]$$.

The probability of the event {X = 4} is

A
1/2
B
$$1/\left( {3\sqrt {2\,\pi } } \right)$$
C
0
D
1/4
3
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The ACF of a rectangular pulse of duration T is
A
a rectangular pulse of duration T
B
a rectangular pulse of duration 2T
C
a triangular pulse of duration T
D
a triangular pulse of duration 2T
4
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The probability density function of the envelope of narrow band Gaussian noise is
A
poisson
B
Gaussian
C
Rayleigh
D
Rician
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Questions Asked from Marks 1
GATE ECE 2024 (1) GATE ECE 2023 (1) GATE ECE 2022 (1) GATE ECE 2017 Set 2 (1) GATE ECE 2014 Set 4 (1) GATE ECE 2012 (2) GATE ECE 2007 (1) GATE ECE 2001 (1) GATE ECE 1998 (3) GATE ECE 1997 (1) GATE ECE 1995 (1)
GATE ECE Subjects
Signals and Systems
Network Theory
Control Systems
Digital Circuits
General Aptitude
Electronic Devices and VLSI
Analog Circuits
Engineering Mathematics
Microprocessors
Communications
Electromagnetics