Discussion :: Exam Questions Paper
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A certain system has transfer function
a is a parameter. Consider the standard negative unity feedback configuration as shown below.
Which of the following statements is true?
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A.
The closed loop system in never stable for any value of a a
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B.
For some positive values of a, the closed loop system is stable, but not for all positive values
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C.
For all positive values of a, the closed loop system is stable
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D.
The closed loop system is stable for all values of a, both positive and negative
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Answer : Option C
Explanation :
Closed loop system transfer function
Use Routh criteria
Thus for all positive value of 'a' this will be stable.
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