June 12, 2021

# Fourier Analysis and Filtering – 1 MCQ’s

This set of MATLAB Multiple Choice Questions & Answers (MCQs) focuses on “Fourier Analysis and Filtering – 1″.

1. The result of the following code is

`p=dtft([1,2,3],3)`

a) Returns a 3-point D.T.F.T.
b) Returns a N-point D.T.F.T.
c) Returns a 3-point D.F.T.
d) Error

2. Butterworth and Low pass filters use _________
a) IIR and FIR Design
b) FIR and IIR Design
c) FIR Design
d) IIR Design

3. The fir1 command can be used to find _____________
a) High Pass Filters using IIR method
b) Low Pass Filters FIR method
c) Filters using Window Method
d) FIR filters using Window Method

4. The multiplication of two signal in time domain signifies _______
a) Convolution in time domain
b) Convolution in frequency (jw) domain
c) Multiplication in frequency (jw) domain
d) Nothing

5.The above command will give

`A=fft((1,2,3),2)`

a) D,F,T after taking a truncated input
b) Yield a 2-point D.F.T.
c) Uses the Butterfly algorithm
d) Error

6. The output of the following codes are

```i fft([1,2],2,2)
ii. fft([1,2],2)```

a) same
b) different
c) I will give error
d) ii wil give error

7. The window function is used to __________
a) multiply it with the incoming signal
b) add it with the incoming signal
c) subtract it from the incoming signal
d) divide the incoming signal

8. The blackmann(N) command returns a ___________
a) N-point periodic blackmann window
b) N+1-point periodic blackmann window
c) N+1-point periodic blackmann window
d) N-point symmetric blackmann window

9. The butter() command takes in ________
a) Stopband attenuation
b) Order of the filter
c) Ripple frequency
d) Nothing

10. The result of the following command is

`hamming[32]`

a) Error
b) A 32 point symmetric Hamming Window
c) A 33 point periodic Hamming Window
d) A 33 point Hamming Window

11. What is the function of the unwarp command?
a) Generate smoother phase plots
b) Generate smoother gain plots
c) Generate smoother root locus
d) No such command

12. What is the value of N while creating a 27 point Hamming window?
a) 28
b) 26
c) 14
d) 13

13. fft2 returns _________
a) a 2-d matrix
b) a 2-d D.F.T
c) a vector
d) No such command

14. The hamming command returns a ___________
a) matrix
b) row vector
c) column vector
d) no such command

15. The default tolerance of the unwarp() function is ________
a) pi
b) 2*pi
c) pi/2
d) 0

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