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If a feedback control system has its open loop transfer function
and its root locus plot intersects the imaginary axis at s = 0; then
the value of ‘K’ at this point will be ________. 
  • a)
    6
  • b)
    7
  • c)
    8
  • d)
    9
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If a feedback control system has its open loop transfer functionand it...
Intersection with jω axis can be found be Routh’s array
1 + G(s)H(s) = 0
Using Routh’s tabular form
The intersection point on the imaginary axis at s =0 is obtained by Routh Hurwitz criteria making s1 row zero and getting the value K = 9.
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If a feedback control system has its open loop transfer functionand its root locus plot intersects the imaginary axis at s = 0; thenthe value of ‘K’ at this point will be ________.a)6b)7c)8d)9Correct answer is option 'D'. Can you explain this answer?
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