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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
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Noise In Digital Communication
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1
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
The signal $$\cos\;\omega_ct\;+\;0.5\;\cos\;\omega_mt\;s\mathrm{in}\;\omega_ct$$ is
A
FM only
B
AM only
C
both AM & FM
D
neither AM nor FM
2
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
A Hilbert transformer is a
A
non-linear system
B
non-causal system
C
time-varying system
D
low-pass system
3
GATE ECE 2006
MCQ (Single Correct Answer)
+2
-0.6
The diagonal clipping in Amplitude Demodulation (using envelope detector) can be avoided if RC time-constant of the envelope detector satisfies the following condition, (here W is message bandwidth and ωc is carrier frequency both in rad/sec)
A
$$\mathrm{RC}\;<\frac1{\mathrm W}$$
B
$$\mathrm{RC}\;>\frac1{\mathrm W}$$
C
$$\mathrm{RC}\;<\frac1{{\mathrm\omega}_\mathrm c}$$
D
$$\mathrm{RC}\;>\frac1{{\mathrm\omega}_\mathrm c}$$
4
GATE ECE 2005
MCQ (Single Correct Answer)
+2
-0.6
A device with input x(t) and output y(t) is characterized by: y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
A
370 kHz
B
190 kHz
C
380 kHz
D
95 kHz
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Questions Asked from Marks 2
GATE ECE 2023 (2) GATE ECE 2022 (1) GATE ECE 2017 Set 2 (2) GATE ECE 2015 Set 1 (1) GATE ECE 2012 (1) GATE ECE 2008 (1) GATE ECE 2007 (1) GATE ECE 2006 (1) GATE ECE 2005 (2) GATE ECE 2004 (1) GATE ECE 2003 (3) GATE ECE 2000 (1) GATE ECE 1993 (2) GATE ECE 1992 (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