Question: The open loop transfer function of a unity feedback control system is given as (mathrm{G}(s)=frac{a s+1}{s^{2}}). The value of ' (a) ' to give a

The open loop transfer function of a unity feedback control system is given as $\mathrm{G}(s)=\frac{a s+1}{s^{2}}$. The value of ' $a$ ' to give a phase margin of $45^{\circ}$ is equal to
(a) 0.141
(b) 0.441
(c) 0.841
(d) 1.141

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