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A system has a complex conjugate root pair of multiplicity two or more in its characteristic equation. The impulse response of the system will be:

A system has a complex conjugate root pair of multiplicity two or more in its characteristic equation. The impulse response of the system will be: Correct Answer A sinusoidal oscillation which rises exponentially ; the system is therefore unstable

Poles are the roots of the denominator of the transfer function and on imaginary axis makes the system stable but multiple poles makes the system unstable.

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