1.

a0 sn + a1 sn-1 + a2sn-2 + ...........+ an-1 s1 + an The necessary condition for system stability for the above characteristic equation is

A. All the coefficients of the characteristic equation should be zero.
B. All the coefficient of the characteristic equation should be unity.
C. All the coefficients of the characteristic equation should be positive and real.
D. All the coefficients of the characteristic equation should be negative and imaginary.
Answer» D. All the coefficients of the characteristic equation should be negative and imaginary.


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