The open-loop DC gain of a unity negative feedback system with closed-loop transfer function  is

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UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
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Answer (Detailed Solution Below)

Option 4 :
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Detailed Solution

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The correct option is 4

Concept:

Closed-loop transfer function = 

For a unity negative feedback system Open-loop transfer function (G(s) H(s)) can be found by subtracting the numerator term from the denominator term 

Application:

Open-loop transfer Function

For DC gain s = 0

∴ open-loop gain 

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