For a second order dynamic system, if the damping ratio is 1 then the

1.	For a second order dynamic system, if the damping ratio is 1 then the poles are
A.	Imaginary and complex conjugate
B.	In the right-half of s-plane
C.	Equal, negative and real
D.	Negative and real
Answer» D. Negative and real

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For a second order dynamic system, if the damping ratio is 1 then the poles are

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