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The order of a linear constant-coefficient differential equation representing a system refers to the number of

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The order of a linear constant-coefficient differential equation representing a system refers to the number of

(a) Active devices

(b) Elements including sources

(c) Passive devices

(d) None of the mentioned

The question was posed to me in an interview for internship.

My query is from The z- and s-Domain Relationship in portion Digital Control Systems of Control Systems

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The correct choice is (d) None of the mentioned

Explanation: The order of the differential equation is the power of the highest order of the differential term and which refers  to the number of poles in the transfer function and practically it refers to the number of components that are energy storing elements .

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