1
GATE EE 2015 Set 2
Numerical
+2
-0
A differential equation $$\,\,{{di} \over {dt}} - 0.21 = 0\,\,$$ is applicable over $$\,\, - 10 < t < 10.\,\,$$ If $$i(4)=10,$$ then $$i(-5)$$ is
2
GATE EE 2015 Set 1
Numerical
+2
-0
A solution of the ordinary differential equation $$\,\,{{{d^2}y} \over {d{t^2}}} + 5{{dy} \over {dt}} + 6y = 0\,\,$$ is such that $$y(0)=2$$ and $$y(1)=$$ $$- \left( {{{1 - 3e} \over {{e^3}}}} \right).$$ The value of $${{dy} \over {dt}}\left( 0 \right)$$ is
3
GATE EE 2014 Set 2
+2
-0.6
Consider the differential equation $${x^2}{{{d^2}y} \over {d{x^2}}} + x{{dy} \over {dx}} - y = 0.\,\,$$ Which of the following is a solution to this differential equation for $$x > 0?$$
A
$${e^x}$$
B
$${x^2}$$
C
$$1/x$$
D
$$lnx$$
4
GATE EE 2014 Set 1
+2
-0.6
The solution for the differential equation $$\,\,{{{d^2}x} \over {d{t^2}}} = - 9x,\,\,$$ with initial conditions $$x(0)=1$$ and $${{{\left. {\,\,\,\,{{dx} \over {dt}}} \right|}_{t = 0}} = 1,\,\,}$$ is
A
$${t^2} + t + 1$$
B
$$\sin 3t + {1 \over 3}\cos 3t + {2 \over 3}$$
C
$${1 \over 3}\sin 3t + \cos 3t$$
D
$$\cos 3t + t$$
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