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First order system is defined as :

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First order system is defined as :

(a) Number of poles at origin

(b) Order of the differential equation

(c) Total number of poles of equation

(d) Total number of poles and order of equation

The question was posed to me during an internship interview.

The origin of the question is Time Response of First Order Systems in chapter Time Response Analysis, Design Specifications and Performance Indices of Control Systems

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The correct option is (d) Total number of poles and order of equation

Easy explanation: First order system is defined by total number of poles and also which is same as the order of differential equation.

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