Relation of resonant peak & resonant frequency

Q.  At which condition of 'ξ', resonant peak does not exist and its maximum value is considered to be unity along with zero resonant frequency?
- Published on 09 Oct 15

a. 0 < ξ < 0.707
b. ξ > 0.707
c. ξ = 0
d. ξ = 1

ANSWER: ξ > 0.707

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