engineering recuitment HPCL Junior Executive 2025 Mock Test Control Systems

The open-loop DC gain of a unity negative feedback system with closed-loop transfer function \(\frac{s+4}{s^2+7 s+13}\) is

1
\(\frac{4}{13}\)
2
\(\frac{2}{3}\)
3
\(\frac{1}{3}\)
4
\(\frac{4}{9}\)
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