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Recent questions and answers in Differential Equations
0
votes
0
answers
1
GATE201336
$\oint \frac{z^24}{z^2+4} dz$ evaluated anticlockwise around the circle $zi=2$ , where $i=\sqrt{1}$, is $4\pi$ 0 $2+\pi$ $2+2i$
asked
Feb 12, 2017
in
Differential Equations
by
piyag476
(
1.5k
points)
gate2013ee
integral
equations
0
votes
0
answers
2
GATE2014226
To evaluate the double integral $\int_{0}^{8}(\int_{(y/2)}^{y/2+1}(\frac{2xy}{2})dx)dy$ , we make the substitution $u=(\frac{2xy}{2})$ and $v=\frac{y}{2}$ The integral will reduce $\int_{0}^{4}(\int_{0}^{2}2udu) dv$ $\int_{0}^{4}(\int_{0}^{1}2udu) dv$ $\int_{0}^{4}(\int_{0}^{1}udu) dv$ $\int_{0}^{4}(\int_{0}^{2}udu) dv$
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
integral
upperlimit
lowerlimit
0
votes
0
answers
3
GATE201425
Consider the differential equation $x^2\frac{d^2y}{dx^2}+x\frac{dy}{dx}y=0$ . Which of the following is a solution to this differential equation for$x>0$? $e^x$ $x^2$ $1/x$ $lnx$
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
derivatives
equations
0
votes
0
answers
4
GATE2014117
In the formation of RouthHurwitz array for a polynomial, all the elements of a row have zero values. This premature termination of the array indicates the presence of only one root at the origin Imaginary roots only positive real roots only negative real roots
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
routhhurwitz
array
polynomial
0
votes
0
answers
5
GATE201413
The solution for the differential equation $\frac{d^2x}{dt^2}=9x$ with initial conditions $x(0)=1$ and $\frac{dx}{dt}_{t=0}=1$ , is $t^2+t+1$ $sin3t+\frac{1}{3}cos3t+\frac{2}{3}$ $\frac{1}{3}sin3t+cos3t$ $cos3t$+$t$
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
boundarylimits
differential
equation
0
votes
0
answers
6
GATE201412
Let $f(x)=xe^{x}$ . The maximum value of the function in the interval ($0,\infty$) is $e^{1}$ $e$ $1$$e^{1}$ $1$+$e^{1}$
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
interval
functions
0
votes
0
answers
7
GATE20141GA5
The roots of $ax^2+bx+c=0$ are real and positive. $a$, $b$ and $c$ are real. Then $ax^2+bx+c=0$ has no roots $2$ real roots $3$ real roots $4$ real roots
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
roota
realvalued
0
votes
0
answers
8
GATE2015228
A differential equation $\frac{di}{dt}0.2i=0$ is applicable over $−10 < t < 10$. If $i(4) = 10$, then $i(−5)$ is _________.
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2015ee2
nonlinearequation
eulersequation
0
votes
0
answers
9
GATE2015127
A solution of the ordinary differential equation $\frac{d^{2}y}{dt^{2}}+5\frac{dy}{dt}+6y=0$ is such that $y(0) = 2$ and $y(1)= \frac{13e}{e^{3}}$. The value of $\frac{dy}{dt}(0)$ is _______.
asked
Feb 12, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2015ee1
ordinarydifferentialequation
0
votes
0
answers
10
GATE2016230
Let $y(x)$ be the solution of the differential equation $\frac{d^{2}y}{dx^{2}}4\frac{dy}{dx}+4y=0$ with initial conditions $y(0)=0$ and $\frac{dy}{dx}\mid _{x=0}=1$ Then the value of $y(1)$ is _________.
asked
Jan 30, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2016ee2
quadraticequation
boundarylimits
0
votes
0
answers
11
GATE201628
The solution of the differential equation, for $t > 0, y"(t)+2y'(t)+y(t)=0$ with initial conditions $y(0)=0$ and $y'(0)=1$, is ($u(t)$ denotes the unit step function), $te^{t}u(t)$ $(e^{t}te^{t})u(t)$ $(e^{t}+te^{t})u(t)$ $e^{t}u(t)$
asked
Jan 30, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2016ee2
higherorderdifferentialequations
euler'sequation
initialboundaryconditions
0
votes
0
answers
12
GATE201624
Consider a causal $LTI$ system characterized by differential equation $\frac{dy(t)}{dt}+\frac{1}{6}y(t)=3x(t)$ The response of the system to the input $x(t)=3e^{\frac{t}{3}}u(t)$, where $u(t)$ denotes the unit step function, is $9e^{\frac{t}{3}}u(t)$ $9e^{\frac{t}{6}}u(t)$ $9e^{\frac{t}{3}}u(t)6e^{\frac{t}{6}}u(t)$ $54e^{\frac{t}{6}}u(t)54e^{\frac{t}{3}}u(t)$
asked
Jan 30, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2016ee2
function
derivative
numerical methods
0
votes
0
answers
13
GATE201615
The value of the integral $\oint _{c}\frac{2z+5}{\left ( z\frac{1}{2} \right ) \left (z^{2} 4z+5 \right )}dz$ over the contour $z=1$, taken in the anticlockwise direction, would be $\frac{24 \pi i}{13}$ $\frac{48 \pi i}{13}$ $\frac{24}{13}$ $\frac{12}{13}$
asked
Jan 30, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2016ee1
partialderivative
upperlimit
lowerlimit
0
votes
0
answers
14
GATE201614
A function $y(t)$, such that $y(0)=1$ and $y(1)=3e^{1}$, is a solution of the differential equation $\frac{d^{2}y}{dt^{2}}+2\frac{dy}{dt}+y=0$. Then $y(2)$ is $5e^{1}$ $5e^{2}$ $7e^{1}$ $7e^{2}$
asked
Jan 30, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2016ee1
quadraticequation
repeatedroots
linearordinarydifferentialequation
0
votes
0
answers
15
GATE201611
The maximum value attained by the function. $f(x) = x(x1) (x2)$ in the interval $[1, 2]$ is ___________.
asked
Jan 30, 2017
in
Differential Equations
by
makhdoom ghaya
(
9.2k
points)
gate2016ee1
maxima
minima
criticalpoint
closedinterval
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