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Consider the function $$g(t) = {e^{ - t}}\,\,\,\sin (2\pi t)\,u(t)$$ where u(t) is the unit step function. The area unde...
GATE ECE 2015 Set 3
The waveform of a periodic signal x(t) is shown in the figure. A signal g(t) is defined by $$g(t) = x\left( {{{t - 1... GATE ECE 2015 Set 1 The phase response of a passband waveform at receiver is given by$$\varphi \,(f) = - 2\,\pi \,\alpha \,(f - {f_c}) - \...
GATE ECE 2014 Set 3
A discrete - time signal x[n] = $${\rm{sin(}}\,{\pi ^2}n)$$, n being an integer is
GATE ECE 2014 Set 1
For a periodic signal v(t) = 30 sin 100t + 10cos 300t + 6sin $${\rm{(500t + }}\,\pi /4)$$, the fundamental frequency in...
GATE ECE 2013
Consider an angle modutated signal $$x(t) = 6\,\,\cos \,[2\,\pi \, \times {10^6}t + 2\sin (8000\pi t)\,4\cos (8000\pi t... GATE ECE 2010 A fully charged mobile phone with a 12 V battery is good for a 10 minute talk-time. Assume that, during the talk-time, t... GATE ECE 2009 A solution for the differential equation$$\mathop x\limits^. $$(t) + 2 x (t) =$$\delta (t)$$with intial condition$$x...
GATE ECE 2006
The Dirac delta function $$\delta (t)$$ is defined as
GATE ECE 2006
The function x(t) is shown in Fig. Even and odd parts of a unit-step function u(t) are respectively. ...
GATE ECE 2005
Let $$\delta (t)$$ denote the delta function. The value of the the integral $$\int\limits_{ - \infty }^\infty {\delta (... GATE ECE 2001 The ACF of a rectangular pulse of duration T is GATE ECE 1998 Marks 2 More The complex envelope of the bandpass signal$$x(t) = - \sqrt 2 \left( {{{\sin \,(\pi t/5)} \over {\pi t/5}}} \right)\,\...
GATE ECE 2015 Set 3
An LTI system having transfer function $${{{s^2} + 1} \over {{s^2} + 2s + 1}}$$ and input x(t) = sin (t + 1) is in stead...
GATE ECE 2009
A Hilbert transformer is a
GATE ECE 2007
In the following scheme, if the spectrum M(f) of m(t) is as shown, then the spectrum Y(f) of y(t) will be: ...
GATE ECE 2007
As x is increased from $$- \infty \,\,to\,\infty$$, the function $$f(x) = {{{e^x}} \over {1 + {e^x}}}$$
GATE ECE 2006
The derivative of the symmetric function drawn in Fig .1 will look like ...
GATE ECE 2005
The value of the integral $$\,I = {1 \over {\sqrt {2\,\,\pi } }}\int\limits_0^\infty {\exp \left( { - {{{x^2}} \over 8}... GATE ECE 2005 Match the following and choose the correct combination. GROUP 1 E- continuous and aperiodic signal F- continuous ... GATE ECE 2005 Consider the sequence$$x[n] = [ - \,4 - \,j5,\,\mathop {1 + j2}\limits_ \uparrow ,\,\,4] The conjugate anti-symm...
GATE ECE 2004
Match each of the items, A, B and C, with an appropriate item from 1, 2, 3, 4 and 5 A. Fourier transform of a Gaussian...
GATE ECE 1995

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