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Test: Frequency Domain Sampling


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10 Questions MCQ Test Signals and Systems | Test: Frequency Domain Sampling

Test: Frequency Domain Sampling for Electrical Engineering (EE) 2022 is part of Signals and Systems preparation. The Test: Frequency Domain Sampling questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Frequency Domain Sampling MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Frequency Domain Sampling below.
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Test: Frequency Domain Sampling - Question 1

If x(n) is a finite duration sequence of length L, then the discrete Fourier transform X(k) of x(n) is given as:

Detailed Solution for Test: Frequency Domain Sampling - Question 1

Explanation: If x(n) is a finite duration sequence of length L, then the Fourier transform of x(n) is given as

If we sample X(ω) at equally spaced frequencies ω=2πk/N, k=0,1,2…N-1 where N>L, the resultant samples are

Test: Frequency Domain Sampling - Question 2

If X(k) discrete Fourier transform of x(n), then the inverse discrete Fourier transform of X(k) is:

Detailed Solution for Test: Frequency Domain Sampling - Question 2

Explanation: If X(k) discrete Fourier transform of x(n), then the inverse discrete Fourier transform of X(k) is given as

Test: Frequency Domain Sampling - Question 3

A finite duration sequence of length L is given as x(n) =1 for 0≤n≤L-1=0 otherwise , then what is the N point DFT of this sequence for N=L?

Detailed Solution for Test: Frequency Domain Sampling - Question 3

Explanation: The Fourier transform of this sequence is

If N=L, then X(k)= L for k=0
=0 for k=1,2….L-1

Test: Frequency Domain Sampling - Question 4

 The Nth rot of unity WN is given as: 

Detailed Solution for Test: Frequency Domain Sampling - Question 4

Explanation: We know that the Discrete Fourier transform of a signal x(n) is given as

Thus we get Nth rot of unity WN= e-j2π/N

Test: Frequency Domain Sampling - Question 5

Which of the following is true regarding the number of computations requires to compute an N-point DFT? 

Detailed Solution for Test: Frequency Domain Sampling - Question 5

Explanation: The formula for calculating N point DFT is given as

From the formula given at every step of computing we are performing N complex multiplications and N-1 complex additions. So, in a total to perform N-point DFT we perform N2 complex multiplications and N(N-1) complex additions.

Test: Frequency Domain Sampling - Question 6

 Which of the following is true? 

Detailed Solution for Test: Frequency Domain Sampling - Question 6

Explanation: If XN represents the N point DFT of the sequence xN in the matrix form, then we know that

Test: Frequency Domain Sampling - Question 7

What is the DFT of the four point sequence x(n)={0,1,2,3}?

Detailed Solution for Test: Frequency Domain Sampling - Question 7

Explanation: The first step is to determine the matrix W4. By exploiting the periodicity property of W4 and the symmetry property
WNk+N/2= -WNk
The matrix W4 may be expressed as

Test: Frequency Domain Sampling - Question 8

If X(k) is the N point DFT of a sequence whose Fourier series coefficients is given by ck, then which of the following is true? 

Detailed Solution for Test: Frequency Domain Sampling - Question 8

 

Explanation: The Fourier series coefficients are given by the expression

Test: Frequency Domain Sampling - Question 9

 What is the DFT of the four point sequence x(n)={0,1,2,3}?

Detailed Solution for Test: Frequency Domain Sampling - Question 9

  Given x(n)={0,1,2,3}
We know that the 4-point DFT of the above given sequence is given by the expression

In this case N=4
=>X(0)=6,X(1)=-2+2j,X(2)=-2,X(3)=-2-2j.

Test: Frequency Domain Sampling - Question 10

 If W4100=Wx200, then what is the value of x? 

Detailed Solution for Test: Frequency Domain Sampling - Question 10

Explanation: We know that according to the periodicity and symmetry property,
100/4=200/x=>x=8.

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