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The phase margin of a system having the loop transfer function  is

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UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
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  1. 45°
  2. 90°
  3. 30°
  4. 60°

Answer (Detailed Solution Below)

Option 3 : 30°
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Detailed Solution

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Concept:

Let 's' be 

Square on both sides

Let 

Solving the equation, we get x = 3, - 4.

So, 

Phase margin = 

Phase margin = 180 - 150 = 30°

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