An open loop transfer function is given by G(s) = K (s + 1) / (s + 4)(s^2 + 3s + 2). It has: - Automatic Control Systems

Electronics and Communication Engineering (ECE) : Automatic Control Systems - Quiz(MCQ)

An open loop transfer function is given by G(s) = K (s + 1) / (s + 4)(s^2 + 3s + 2). It has:

A)

One zero at infinity

B)

Two zeroes at infinity

C)

Three zeroes at infinity

D)

None of the above

Correct Answer : Option (B) : Two zeroes at infinity

Explanation : The formula to calculate a number of zeroes at infinity is P - Z. Here, P and Z are the number of poles and zeroes in a given transfer function.

We know that poles are calculated by equating the denominator to zero, and zeroes are calculated by equating the numerator to zero. So, for the above given transfer function, we get:

P = 3

Z = 1

So, the number of zeroes at infinity = 3 - 1 = 2

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A)

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B)

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C)

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D)

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A)

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B)

setting s = -jÏ‰ in the network function

C)

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D)

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A)

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B)

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C)

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D)

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