Which of the given signals are periodic?(a) x(t) = 4 cos(5πt)(b) x(t) = u(t) – 1/2(c) x(t) = 4u(t) + 2sin(3t)(d) x[n] = 2sin(3n)I have been asked this question in a job interview.My doubt stems from Classification of Signals in division Signals and Spectra of Digital Communications

Which of the given signals are periodic?(a) x(t) = 4 cos(5πt)(b) x(t)

1.	Which of the given signals are periodic?(a) x(t) = 4 cos(5πt)(b) x(t) = u(t) – 1/2(c) x(t) = 4u(t) + 2sin(3t)(d) x[n] = 2sin(3n)I have been asked this question in a job interview.My doubt stems from Classification of Signals in division Signals and Spectra of Digital Communications
Answer» The correct CHOICE is (a) x(t) = 4 COS(5πt) The EXPLANATION: T=2π / 5π = 2/5, periodic with PERIOD 2/5.

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Which of the given signals are periodic?(a) x(t) = 4 cos(5πt)(b) x(t) = u(t) – 1/2(c) x(t) = 4u(t) + 2sin(3t)(d) x[n] = 2sin(3n)I have been asked this question in a job interview.My doubt stems from Classification of Signals in division Signals and Spectra of Digital Communications

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