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Nyquist Plot Question & Answers

October 7, 2022 By WatElectronics

This article lists 40 Nyquist Plot MCQs for engineering students. All the Nyquist Plot Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Nyquist Plot.

Harry Nyquist an engineer at Bell Laboratories discovered the ‘Nyquist plot’. This plot is a continuation of Polar plots. To find closed loops control system stability by changing omega (ω) i.e., from -∞ to + ∞. Complete response of frequency is obtained of open loop transfer functions using this plot.

The criterion of Nyquist stability is based on the 'Principle of argument'. If poles and zeroes are presently enclosed in a path close to plane S, then G(s) H(s) corresponding plane must be encircled origin with times P-Z. Hence the encirclements can be written as N is P-Z.

The selected enclosed path of a Nyquist plane is referred to as Nyquist Contour. All the poles if lying in the s-planes left halve make the closed loops control system stable. Critical point lying encirclements outside indicates the absolute stability of closed-loop control systems.

Cross-over frequencies of phase and gain also their margins that are used in finding out whether the systems are stable or not are determined using the Nyquist plot. Control engineering and the processing of signals use this response of frequency known as a Nyquist plot.

1). _______ used in determining the stability of the control system?

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2). ___________ plots are continued from Polar plots?

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3). On what principle Nyquist stability is based?

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4). How many encirclements are enclosed if a path is closed?

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5). What if the enclosed path consists of poles but not zeroes then the direction encircled is?

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6). The path selected based on Principle of Argument is in a Nyquist plot is _________?

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7). Poles present on left-half of plane S of a Closed-loop Transfer function indicates ________?

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8). What is known as the roots of a Characteristic equation?

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9). Poles of a Characteristic equation are similar to poles of a ____________ Transfer function?

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10). A Nyquist plot doesn't contain any pole of open-loop on the right side of plane S then N is equivalent to ___________?

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Nyquist Plot MCQs for Exams

11). What if there are no closed-loop poles on the right side of the S-plane in a Nyquist plot?

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12). Number of encircles at a Critical point must equivalent to ___________?

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13). Frequency where the Nyquist plots intersect negative part of Real axis is referred to as ____________?

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14). Nyquist plots have magnitude as one at a certain frequency referred to as ____________?

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15). Control system gets stable if?

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16). If Phase Cross Over Frequency = Gain Cross Over Frequency indicates the system?

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17). What is the reciprocal of Nyquist plots magnitude?

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18). Phase Margin is equivalent to ___________?

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19). Based on margins how do the control systems indicate stability?

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20). Control systems are marginally stable if the Gain margin is _______?

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Nyquist Plot MCQs for Students

21). If gain margin is lesser than one indicates system is __________?

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22). How does the frequency in the Nyquist plot get varied?

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23). What is the basic difference between polar and Nyquist plots?

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24). ________ combines phase and gain in a single plot of complex planes?

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25). How the Nyquist plots are described in the cartesian system of coordinates?

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26). How Nyquist plot described based on Polar coordinates?

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27). What are the plots that determine the Relative stability of systems?

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28). Closed contour present on plane S that enclose entire RHS referred to as _________?

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29). Radius of the semi-circle on the Nyquist plot is referred to as ________?

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30). Process of transforming point present in plane S into F(s) referred to as _________?

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Nyquist Plot MCQs for Quiz

31). Interconnection of all mapped distinct segments yields the needed _________?

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32). What is required in preserving the information of signals?

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33). What is the radius size for any Nyquist Contour?

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34). What is the point where the Nyquist plots pass considering the system as stable?

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35). Contour gets encircled to point -1 indicates the system as ________?

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36). Nyquist plot finds _________ of an Open-loop Transfer function?

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37). What doesn't provide exact information on poles?

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38). Nyquist plot use _________ Mathematical techniques?

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39). What is better compared to Root locus?

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40). What is utilized in drawing a complete response of frequency for an Open-loop Transfer function?

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