Q.

Sum of two periodic signals is a periodic signal when the ratio of their time periods is

A. a rational number
B. an irrational number
C. a complex number
D. an integer
Answer» A. a rational number
Explanation: sum of two periodic signals is a periodic signal only when the ratio of their time periods is a rational number or it is the ratio of two integers. for e.g., t1/t2 = 5/7 → periodic; t1/t2 = 5 → aperiodic.
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