Question

For any given signal, average power in its 6 harmonic components as 10 mw each and fundamental component also has 10 mV power. Then, average power in the periodic signal is _______________

(a) 70

(b) 60

(c) 10

(d) 5

I have been asked this question during an interview for a job.

Question is from Concept of Convolution topic in chapter Signal Transmission Through Linear Systems of Signals and Systems

Answer 1

Correct option is (b) 60

Explanation: We know that according to Parseval’s relation, the average power is equal to the sum of the average powers in all of its harmonic components.

∴ Pavg = 10 × 6 = 60.