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Which of the following cannot be the Fourier series expansion of a periodic signals?
Select one:
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following cannot be the Fourier series expansion of a per...
→  x(t) = 2cos t + 3cos t is periodic signal with fundamental frequency ω = 1.
→  The frequency of first term  frequency of 2nd term is ω2 = 1.
 is not the rational number
 So, x(t) is a periodic or not periodic.
→ x(t) = cos t + 0.5 is a periodic function with
→  first term has frequency 

2nd term has frequency 

So about ratio is rational number x(t) is a periodic signal, with fundamentalfrequency 
Since function in (b) is non periodic. So does not satisfy Dirichlet conditionand cannot be expanded in Fourier series.
The correct answer is: 
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Most Upvoted Answer
Which of the following cannot be the Fourier series expansion of a per...
Answer should be option b cuz 0.5 is not periodic and if a function is not periodic it violates Dirichlet condition so answer is option b answer could not be d there is a mistake correct answer is b
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Community Answer
Which of the following cannot be the Fourier series expansion of a per...
Please explain why we not consider the 2nd option because this is also a irrational number..
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Which of the following cannot be the Fourier series expansion of a periodic signals?Select one:a)b)c)d)Correct answer is option 'D'. Can you explain this answer?
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