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GATE ECE

Analog Communication Systems

Communications

Previous Years Questions

Marks 1

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For a superheterodyne receiver, the intermediate frequency is 15 MHz and the local oscillator frequency is 3.5 GHz. If t...
GATE ECE 2016 Set 3
A super heterodyne receiver operates in the frequency range of 58 MHz – 68 MHz. The intermediate frequency f1F and local...
GATE ECE 2016 Set 1
Consider the signal $$s\left(t\right)\;=\;m\left(t\right)\;\cos\left(2{\mathrm{πf}}_\mathrm c\mathrm t\right)\;+\widehat...
GATE ECE 2015 Set 1
Consider an FM signal $$f\left(t\right)\;=\;\cos\left[2{\mathrm{πf}}_\mathrm c\mathrm t\;+\;{\mathrm\beta}_1\sin\;2{\mat...
GATE ECE 2014 Set 3
Consider an angle modulated signal x(t) = 6cos[2$$\mathrm\pi$$x106 t+2sin(8000$$\mathrm\pi$$t) + 4cos(8000$$\mathrm\pi$$...
GATE ECE 2010
Consider the amplitude modulated (AM) signal $$A_c\cos\omega_ct\;+\;2\cos\omega_mt\;\cos\omega_ct$$. For demodulating th...
GATE ECE 2008
Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?
GATE ECE 2005
An AM signal and a narrow-band FM signal with identical carriers, modulating signals and modulation indices of 0.1 are a...
GATE ECE 2004
An AM signal is detected using an envelope detector. The carrier frequency and modulating signal frequency are 1 MHz and...
GATE ECE 2004
A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 µsec. Which of the followin...
GATE ECE 2002
A modulated signal is given by, $$s\left(t\right)=m_1\left(t\right)\cos\left(2{\mathrm{πf}}_\mathrm c\mathrm t\right)\;+...
GATE ECE 1999
A DSB-SC signal is generated using the carrier $$\cos\left(\omega_ct\;+\;\theta\right)$$ and modulating singal x(t). The...
GATE ECE 1998
The image channel selectivity of super heterodyne receiver depends upon
GATE ECE 1998
$$v\left(t\right)\;=5\left[\cos\left(10^6\mathrm{πt}\right)\;-\;\sin\left(10^3\mathrm{πt}\right)\times\sin\left(10^6\mat...
GATE ECE 1994

Marks 2

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A modulating signal given By $$x\left(t\right)=5\sin\left(4\mathrm\pi10^3\mathrm t\;-\;10\mathrm{πcos}2\mathrm\pi10^3\ma...
GATE ECE 2017 Set 2
The un-modulated carrier power in an AM transmitter is 5kW. This carrier is modulated by a sinusoidal modulating signal....
GATE ECE 2017 Set 2
In the system shown in figure (a), m(t) is a low-pass signal with bandwidth W Hz. The frequency response of the band-pas...
GATE ECE 2015 Set 1
The signal m(t) as shown is applied both to a phase modulator (with kp as the phase constant) and a frequency modulator ...
GATE ECE 2012
The signal $$\cos\;\omega_ct\;+\;0.5\;\cos\;\omega_mt\;s\mathrm{in}\;\omega_ct$$ is
GATE ECE 2008
A Hilbert transformer is a
GATE ECE 2007
The diagonal clipping in Amplitude Demodulation (using envelope detector) can be avoided if RC time-constant of the enve...
GATE ECE 2006
A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single ...
GATE ECE 2005
A device with input x(t) and output y(t) is characterized by: y(t) = x2(t). An FM signal with frequency deviation of 90 ...
GATE ECE 2005
Two sinusoidal signals of same amplitude and frequencies 10 kHz and 10.1 kHz are added together. The combined signal is ...
GATE ECE 2004
Let $$m\left(t\right)\;=\cos\left[\left(4\mathrm\pi\times10^3\right)t\right]$$ be the message signal and $$c\left(t\righ...
GATE ECE 2003
Let $$m\left(t\right)\;=\cos\left[\left(4\mathrm\pi\times10^3\right)t\right]$$ be the message signal and $$c\left(t\righ...
GATE ECE 2003
A DSB-SC signal is to be generated with a carrier frequency fc = 1MHz using a nonlinear device with the input-output cha...
GATE ECE 2003
In an FM system, a carrier of 100 MHz is modulated by a sinusoidal signal of 5 KHz. The bandwidth by Carson’s approximat...
GATE ECE 2000
A superheterodyne radio receiver with an intermediate frequency of 455 KHz is tuned to a station operating at 1200 KHz. ...
GATE ECE 1993
Which of the following demodulator(s) can be used for demodulating the signal $$x(t)\;=\;5\left(1+2\;\cos200\mathrm{πt}\...
GATE ECE 1993
The maximum power efficiency of an AM modulator is
GATE ECE 1992

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