1
GATE ECE 2017 Set 2
Numerical
+2
-0
Consider an LTI system with magnitude response $$\left| {H(f)} \right| = \left\{ {\matrix{ {1 - \,{{\left| f \right|} \over {20}},} & {\left| f \right| \le 20} \cr {0,} & {\left| f \right| > 20} \cr } } \right.$$\$ and phase response Arg[H(f)]= - 2f.
If the input to the system is $$x(t) = 8\cos \left( {20\pi t + \,{\pi \over 4}} \right) + \,16\sin \left( {40\pi t + {\pi \over 8}} \right) + 24\,\cos \left( {80\pi t + {\pi \over {16}}} \right)$$
Then the average power of the output signal y(t) is_____________.
2
GATE ECE 2017 Set 1
Numerical
+2
-0
A continuous time signal x(t) = $$4\cos (200\pi t)$$ + $$8\cos(400\pi t)$$, where t is in seconds, is the input to a linear time invariant (LTI) filter with the impulse response $$h(t) = \left\{ {{{2\sin (300\pi t)} \over {\matrix{ {\pi t} \cr {600} \cr } }}} \right.\,,\,\matrix{ t \cr t \cr } \,\matrix{ \ne \cr = \cr } \,\matrix{ 0 \cr 0 \cr }$$

Let y(t) be the output of this filter. The maximum value of $$\left| {y(t)} \right|$$ is ________________________.

3
GATE ECE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
Input x(t) and output y(t) of an LTI system are related by the differential equation y"(t) - y'(t) - 6y(t) = x(t). If the system is neither causal nor stable, the imulse response h(t) of the system is
A
$${1 \over 5}{e^{3t}}u( - t) + {1 \over 5}{e^{ - 2t}}u( - t)$$
B
$${{ - 1} \over 5}{e^{3t}}u( - t) + {1 \over 5}{e^{ - 2t}}u( - t)$$
C
$${1 \over 5}{e^{3t}}u( - t) + {1 \over 5}{e^{ - 2t}}u(t)$$
D
$${{ - 1} \over 5}{e^{3t}}u( - t) - {1 \over 5}{e^{ - 2t}}u(t)$$
4
GATE ECE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
The output of a standrad second-order system for a unit step input is given as $$y(t) = 1 - {2 \over {\sqrt 3 }}{e^{ - t}}\cos \left( {\sqrt 3 t - {\pi \over 6}} \right)$$.

The transfer function of the system is

A
$${2 \over {(s + 2)(s + \sqrt 3) }}$$
B
$${1 \over {{s^2} + 2s + 1}}$$
C
$${3 \over {{s^2} + 2s + 3}}$$
D
$${3 \over {{s^2} + 2s + 4}}$$
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