engineering recuitment BHEL Engineer Trainee Mock Test 2025 Control Systems Stability Analysis

Consider the characteristic polynomial of a feedback system q(s) = s4 + s3 + s2 + s + K

1
The system is stable for all K > 0
2
The system is unstable for K > 0
3
K = 8 results in marginal stability
4
None of the above is correct
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