$x(e^{jw})$ is

a$-$continuous& complex b$-$periodic signal c$-$All of them d$-$NON

$19.$DTFT of $x(n)=[5,0,5]=?$

$\{x(0)=0\}$

a$)10cos(2wn)$

b$)10cos(\frac{1}{2}wn)$

c$)10cos(wn)$

d$)$NON

$20.$If the input to LTI system is $e^{jn}$ and its frequency response is $1+jw,$ Then its output $y(n)$ equals to

a$)e^{j(\frac{}{4}+n)}$

b$)\sqrt[\phantom{2}]{2}{e}^{i(\frac{}{2}+n)}$

c$)\sqrt[\phantom{2}]{2}{e}^{i(\frac{}{4}+n)}$

d$)$NON

$21.$Impulse response of LTI system is a$-$ IIR b$-$ with feedback

c$-$ FIR

d$-$NON

$22.$ Constant time difference equation has

a$-$ FIR b$-$ without feedback

c$-$ IIR

d$-$NON

$23.{\displaystyle \underset{-}{\overset{}{}}}|e^{jw}{|}^2$ for sequence $x(n)=\{1,2,3\}$ equals to

a$)20$

b$)25$

c$)28$

d$)$ NON

$24.{\displaystyle \underset{-}{\overset{}{}}}2(w-2k-\frac{}{2})e^{jwn}dw=?$

a$)e^{j(\frac{}{4})n}$

b$)e^{j(\frac{}{8}{)}^n}$

c$)e^{j(\frac{}{2})n}$

d$)$NON

$25.{\displaystyle \underset{-}{\overset{}{}}}(\frac{5}{4}+cos2w)dw=?$

a$)\frac{5}{4}$

b$)\frac{7}{2}$

c$)\frac{5}{2}$

d$)$ NON

$26.{\displaystyle \underset{-}{\overset{}{}}}\frac{1}{\frac{5}{4}+cosw}dw=?$

a$-(\frac{8}{5})$

b$-\frac{7}{2}$

c$-(\frac{8}{3})$

d$)$NON