Control Systems MCQ Questions & Answers

21

The peak overshoot M_p is a function of

A) Natural frequency of oscillation ω_n only B) Damping ratio ξ only C) Damped natural frequency ω_d only D) Both A and B

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Answer & Solution

Answer: Option B

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22

The third order system is approximated to an equivalent second order system. The rise time of this approximated system will be

A) Same as the original system for any input B) Smaller than the original system for any input C) Larger than the original system for any input D) Smaller or larger depending on the type of input

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Answer & Solution

Answer: Option B

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23

A system with the characteristic equation s² + Ks + 2K - 1 = 0 is stable for the value

A) K < 0 B) K = 0 C) K < $$\frac{1}{2}$$ D) K > $$\frac{1}{2}$$

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Answer & Solution

Answer: Option D

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24

The feedback control system shown in figure is stable for values of K and T
Control Systems mcq question image

A) K < 0, T > -1 B) K > 0, T > 0 C) K > 0, T > -1 D) K < 0, T > 0

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Answer & Solution

Answer: Option C

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25

Which of the following is NOT the advantage of Routh-Hurwitz criterion of control system?

A) By this method, we can also determine the point of intersection for root locus with an imaginary axis B) By this method, we can determine the range of K for stability C) We can easily determine the relative stability of the system D) The criterion is applicable for both linear and non-linear system

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Answer & Solution

Answer: Option D

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26

Which of the following statements is not true for Nyquist criterion?

A) It provides some amount of information about absolute stability as the Routh criterion B) It indicates the degree of stability of stable system C) It gives information concurring the frequency response of the system D) None of these

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Answer & Solution

Answer: Option A

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27

. . . . . . . . is defined as the time delay that a signal component of frequency ω undergoes as it passes from the input to output of the system.

A) Phase delay B) Group delay C) Frequency deviation D) Latency

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Answer & Solution

Answer: Option A

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28

A unity feedback control system is characterized by the open-loop transfer function $$G\left( s \right) = \frac{{10k\left( {s + 2} \right)}}{{{s^3} + 3{s^2} + 10}}.$$ The Nyquist path and the corresponding Nyquist plot of G(s) are shown in the figure below.
If 0 < k < 1, then the number of poles of the closed–loop transfer function that lie in the right-half of the s-plane is

A) 0 B) 1 C) 2 D) 3

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Answer & Solution

Answer: Option C

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29

Consider the following statements for pneumatic and hydraulic control systems:
1. The normal operating pressure of pneumatic control is very much higher than that of hydraulic control.
2. In pneumatic control, external leakage is permissible to a certain extent, but there should be no leakage in a hydraulic control.
Which of the statements given above is/are correct?

A) 1 only B) 2 only C) Both 1 and 2 D) Neither 1 nor 2

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Answer & Solution

Answer: Option C

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30

A linear constant parameter continuous-time system has the following A matrix in its state representation \[\mathop {\rm{X}}\limits^ \cdot = {\rm{AX}} + {\rm{Bu}}{\rm{.}}\]
\[{\rm{A}} = \left[ {\begin{array}{*{20}{c}} 0&\alpha \\ \alpha &0 \end{array}} \right]\]
Which one of the following is the natural response of the system following the application of any input?

A) Me^αt + Ne^-αt B) (M + Nt)e^αt C) (M + Nt)e^-αt D) Mcosαt + Nsinαt

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Answer & Solution

Answer: Option A

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Control Systems MCQ Questions & Answers | ECE