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VCFT: CAT 3 MCQ

Total questions: 10

Worksheet time: 2hrs 40mins

Name
Class
Date
1.

SinA sin B=

a)

 12[sin⁡(A+B)+sin⁡(A−B)]\frac{1}{2}\left[\sin\left(A+B\right)+\sin\left(A-B\right)\right]  

b)

 12[sin⁡(A+B)−sin⁡(A−B)]\frac{1}{2}\left[\sin\left(A+B\right)-\sin\left(A-B\right)\right]  

c)

 12[cos⁡(A+B)+cos⁡(A−B)]\frac{1}{2}\left[\cos\left(A+B\right)+\cos\left(A-B\right)\right]  

d)

 12[cos⁡(A−B)−cos⁡(A+B)]\frac{1}{2}\left[\cos\left(A-B\right)-\cos\left(A+B\right)\right]  

2.

 Fs[f(x) cos⁡ax] isF_s\left[f\left(x\right)\ \cos ax\right]\ is  

a)

 12[Fs(A+S)−Fs(A−S)]\frac{1}{2}\left[F_s\left(A+S\right)-F_s\left(A-S\right)\right]  

b)

 12[Fs(A+S)+Fs(A−S)]\frac{1}{2}\left[F_s\left(A+S\right)+F_s\left(A-S\right)\right]  

c)

 12[Fc(A+s)+Fc(A−s)]\frac{1}{2}\left[F_c\left(A+s\right)+F_c\left(A-s\right)\right]  

d)

 12[Fc(A+s)−Fc(A−s)]\frac{1}{2}\left[F_c\left(A+s\right)-F_c\left(A-s\right)\right]  

3.

The convolution Theorem is

a)

 F[af+bg] =aF[s]  +bG[s]F\left[af+bg\right]\ =aF\left[s\right]\ \ +bG\left[s\right]  

b)

 F[f⋅g] =F[s]  ⋅G[s]F\left[f\cdot g\right]\ =F\left[s\right]\ \ \cdot G\left[s\right]  

c)

 F[af] =1∣a∣F[sa]  F\left[af\right]\ =\frac{1}{\left|a\right|}F\left[\frac{s}{a}\right]\ \   

d)

 F[f′(x)] =−isF[s]  F\left[f'\left(x\right)\right]\ =-isF\left[s\right]\ \   

4.

The Fourier Sine Transform of

 e−5xe^{-5x}  

a)

 Fs[e−5x]=2π 552+s2F_s\left[e^{-5x}\right]=\sqrt{\frac{2}{\pi}}\ \frac{5}{5^2+s^2}  

b)

 Fs[e−5x]=2π s52+s2F_s\left[e^{-5x}\right]=\sqrt{\frac{2}{\pi}}\ \frac{s}{5^2+s^2}  

c)

 Fs[e−5x]=2π sa2+s2F_s\left[e^{-5x}\right]=\sqrt{\frac{2}{\pi}}\ \frac{s}{a^2+s^2}  

d)

none of the above

5.

 Fs(xf(x)) =F_s\left(xf\left(x\right)\right)\ =  

a)

 dds Fc[s]\frac{d}{ds}\ F_c\left[s\right]  

b)

 −dds Fc[s]-\frac{d}{ds}\ F_c\left[s\right]  

c)

 dds Fs[s]\frac{d}{ds}\ F_s\left[s\right]  

d)

 dds Fs[s]\frac{d}{ds}\ F_s\left[s\right]  

6.

Convolution operation is commutative

a)

true

b)

false

c)

some times

d)

none

7.

Parsevals identity for Fourier Transform is

a)

∫−∞∞∣f(x)∣2dx=∫−∞∞∣f(s)∣2ds\int_{-\infty}^{\infty}\left|f\left(x\right)\right|^2dx=\int_{-\infty}^{\infty}\left|f\left(s\right)\right|^2ds

b)

∫0∞∣f(x)∣2dx=∫0∞∣f(s)∣2ds\int_0^{\infty}\left|f\left(x\right)\right|^2dx=\int_0^{\infty}\left|f\left(s\right)\right|^2ds

c)

∫−∞∞∣f(x)∣dx=∫−∞∞∣f(s)∣ds\int_{-\infty}^{\infty}\left|f\left(x\right)\right|^{ }dx=\int_{-\infty}^{\infty}\left|f\left(s\right)\right|^{ }ds

d)

∫−∞∞f(x)2dx=∫−∞∞f(s)2ds\int_{-\infty}^{\infty}f\left(x\right)^2dx=\int_{-\infty}^{\infty}f\left(s\right)^2ds

8.

 ∫0∞sin⁡2t t2dt\int_0^{\infty}\frac{\sin^2t\ }{t^2}dt  


a)

  π2\ \frac{\pi}{2}  

b)

  π4\ \frac{\pi}{4}  

c)

  π\ \pi  

d)

0

9.

The  inverse Fourier Transform of   F[f(x)] F[f(x)]\  is  f(x) =f\left(x\right)\ =   

a)

 12π∫−∞∞ F[s] dx = f(x)\frac{1}{\sqrt{2\pi}}\int_{-\infty}^{\infty}\ F\left[s\right]\ dx\ =\ f\left(x\right)  

b)

 12π∫−∞∞F[s]eisx ds =f(x)\frac{1}{\sqrt{2\pi}}\int_{-\infty}^{\infty}F\left[s\right]e^{isx}\ ds\ =f\left(x\right)  

c)

 12π∫−∞∞F[s] e−isxds =f(x)\frac{1}{\sqrt{2\pi}}\int_{-\infty}^{\infty}F\left[s\right]\ e^{-isx}ds\ =f\left(x\right)  

d)

 12π∫−∞∞F[s]  cos⁡sx ds = f(x)\frac{1}{\sqrt{2\pi}}\int_{-\infty}^{\infty}F\left[s\right]\ \ \cos sx\ ds\ =\ f\left(x\right)  

10.

The Fourier cosine Transform of f(x) is  Fc[f(x)]=F_c[f(x)]=  

a)

 12π∫−∞∞f(x) cos⁡sx dx = Fc[s]\frac{1}{\sqrt{2\pi}}\int_{-\infty}^{\infty}f\left(x\right)\ \cos sx\ dx\ =\ F_c\left[s\right]  

b)

 12π∫0∞f(x) cos⁡sx dx = Fc[s]\frac{1}{\sqrt{2\pi}}\int_0^{\infty}f\left(x\right)\ \cos sx\ dx\ =\ F_c\left[s\right]  

c)

 2π∫0∞f(x) cos⁡sx dx = Fc[s]\sqrt{\frac{2}{\pi}}\int_0^{\infty}f\left(x\right)\ \cos sx\ dx\ =\ F_c\left[s\right]  

d)

 12π∫−∞∞f(x)  cos⁡sx dx = Fs[s]\frac{1}{\sqrt{2\pi}}\int_{-\infty}^{\infty}f\left(x\right)\ \ \cos sx\ dx\ =\ F_s\left[s\right]