The polynomial s4+Ks3+s2+s+1=0 the range of K for stability is _____________
A. K>5
B. -10<K
C. K>-4
D. K-1>0
Answer:D
The polynomial s4+Ks3+s2+s+1=0 the range of K for stability is _____________
A. K>5 B. -10<K C. K>-4 D. K-1>0
Explanation: Solving using Routh array we get K-1>0 and is always negative for K>1.