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  1. The feedback system with characteristic equation
    s4 + 20 Ks3 + 5s2 + 10s + 15 = 0 is—
    1. stable for all value of K
    2. stable for positive value of K
    3. stable for ∞ > K > 7.0
    4. unstable for any values of K
Correct Option: D

NA



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