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Which of the following plots is NOT used in frequency response analysis? 

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BHEL Engineer Trainee Electrical 23 Aug 2023 Official Paper
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  1. Magnitude versus phase angle plot 
  2. Polar plot  
  3. Nyquist plot 
  4. Bode plot  

Answer (Detailed Solution Below)

Option 1 : Magnitude versus phase angle plot 
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Detailed Solution

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The correct answer is: 1) Magnitude versus phase angle plot

Explanation:

A Bode plot is the most common tool for frequency response analysis. It consists of two graphs:

  • Magnitude (in dB) vs. frequency (log scale)
  • Phase angle vs. frequency (log scale)

Nyquist Plot 
A Nyquist plot represents the frequency response of a system in the complex plane, plotting real vs. imaginary parts of the transfer function as frequency varies.

Polar Plot 
A polar plot (similar to a Nyquist plot) displays magnitude and phase in polar coordinates, where the radial distance represents magnitude and the angle represents phase.

Magnitude vs. Phase Angle Plot 
While this plot shows magnitude and phase, it does not explicitly include frequency, making it unsuitable for frequency response analysis. Instead, it is more commonly used in Nichols charts (a variation for stability analysis).

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