Question: 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:
Options
A : A sinusoidal oscillation which decays exponentially; the system is therefore stable
B : A sinusoidal oscillation with a time multiplier ; the system is therefore unstable
C : A sinusoidal oscillation which rises exponentially ; the system is therefore unstable
D : A dc term harmonic oscillation the system therefore becomes limiting stable
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