1
GATE EE 2023
MCQ (Single Correct Answer)
+1
-0.33

A continuous-time system that is initially at rest is described by

$${{dy(t)} \over {dt}} + 3y(t) = 2x(t)$$,

where $$x(t)$$ is the input voltage and $$y(t)$$ is the output voltage. The impulse response of the system is

A
$$3{e^{ - 2t}}$$
B
$${1 \over 3}{e^{ - 2t}}u(t)$$
C
$$2{e^{ - 3t}}u(t)$$
D
$$2{e^{ - 3t}}$$
2
GATE EE 2023
MCQ (Single Correct Answer)
+1
-0.33

The Fourier transform $$X(\omega)$$ of the signal $$x(t)$$ is given by

$$X(\omega ) = 1$$, for $$|\omega | < {W_0}$$

$$ = 0$$, for $$|\omega | > {W_0}$$

Which one of the following statements is true?

A
$$x(t)$$ tends to be an impulse as $${W_0} \to \infty $$.
B
$$x(0)$$ decreases as $${W_0}$$ increases.
C
At $$t = {\pi \over {2{W_0}}},x(t) = - {1 \over \pi }$$
D
At $$t = {\pi \over {2{W_0}}},x(t) = {1 \over \pi }$$
3
GATE EE 2023
MCQ (Single Correct Answer)
+1
-0.33

The Z-transform of a discrete signal $$x[n]$$ is

$$X(z) = {{4z} \over {(z - {1 \over 5})(z - {2 \over 3})(z - 3)}}$$ with $$ROC = R$$.

Which one of the following statements is true?

A
Discrete-time Fourier transform of $$x[n]$$ converges if R is $$|z| > 3$$
B
Discrete-time Fourier transform of $$x[n]$$ converges if R is $${2 \over 3} < |z| < 3$$
C
Discrete-time Fourier transform of $$x[n]$$ converges if R is such that $$x[n]$$ is a left-sided sequence
D
Discrete-time Fourier transform of $$x[n]$$ converges if R is such that $$x[n]$$ is a right-sided sequence
4
GATE EE 2023
MCQ (Single Correct Answer)
+1
-0.33

Which of the following statement(s) is/are true?

A
If an LTI system is causal, it is stable
B
A discrete time LTI system is causal if and only if its response to a step input u[n] is 0 for n < 0
C
If a discrete time LTI system has an impulse response h[n] of finite duration the system is stable
D
If the impulse response $$0 < |h[n]| < 1$$ for all n, then the LTI system is stable.
EXAM MAP