If D1, D2, D3, D4 are the distortion produced by second, third, fourt – McqOptions

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1.	If D1, D2, D3, D4 are the distortion produced by second, third, fourth, fifth respectively (others are insignificant). Then total harmonic distortion is __________
A.	√(D12+D22+D32+D42)
B.	√(D12+D32)
C.	√(D22+D42)
D.	√(D12+D22)
Answer» B. √(D12+D32)

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