Control Systems MCQ Questions & Answers

21

From the figure shown below, the Transfer function of the signal flow graph is:
Control Systems mcq question image

A) $$\frac{{{{\text{T}}_{12}}}}{{1 - {{\text{T}}_{22}}}}$$ B) $$\frac{{{{\text{T}}_{22}}}}{{1 - {{\text{T}}_{12}}}}$$ C) $$\frac{{{{\text{T}}_{12}}}}{{1 + {{\text{T}}_{22}}}}$$ D) $$\frac{{{{\text{T}}_{22}}}}{{1 + {{\text{T}}_{12}}}}$$

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Answer & Solution

Answer: Option A

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22

In a closed loop system for which the output is the speed of a motor, the output rate control can be used to:

A) Limit the speed of the motor B) Limit the torque output of the motor C) Reduce the damping of the system D) Limit the acceleration of the motor

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Answer & Solution

Answer: Option A

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23

The following quantities give a measure of the transient characteristics of a control system, when subjected to unit step excitation:
1. Maximum overshoot
2. Maximum undershoot
3. Overall gain
4. Delay time
5. Rise time
6. Fall time

A) 1, 3 and 5 B) 2, 4 and 5 C) 2, 4 and 6 D) 1, 4 and 5

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Answer & Solution

Answer: Option D

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24

For the given circuit, which one of the following is the correct state equation?
Control Systems mcq question image

A) \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} { - 4}&4\\ { - 2}&{ - 4} \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 0&4\\ 4&0 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\] B) \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} { - 4}&{ - 4}\\ { - 2}&{ - 4} \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 4&0\\ 0&4 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\] C) \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} { - 4}&{ - 4}\\ { - 2}&4 \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 4&4\\ 4&0 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\] D) \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} 4&{ - 4}\\ { - 2}&{ - 4} \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 0&4\\ 4&4 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\]

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Answer & Solution

Answer: Option A

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25

What is the value of K for a unity feedback system with $$G\left( s \right) = \frac{K}{{s\left( {1 + s} \right)}}$$ to have a peak overshoot of 50%?

A) 0.53 B) 5.3 C) 0.6 D) 0.047

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Answer & Solution

Answer: Option B

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26

Which of the following components can be used as a rotating amplifier in a control system?
1. An amplidyne
2. A separately excited dc generator
3. A self-excited dc generator
4. A synchro
Select the correct answer using the options given below:

A) 3 and 4 B) 1 and 2 C) 1, 2 and 3 D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option B

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27

For the following feedback system $$G\left( s \right) = \frac{1}{{\left( {s + 1} \right)\left( {s + 2} \right)}}.$$ The 2% settling time of the step response is required to be less than 2 seconds.
Which one of the following compensators C(s) achieves this?
Control Systems mcq question image

A) $$3\left( {\frac{1}{{s + 5}}} \right)$$ B) $$5\left( {\frac{{0.03}}{s} + 1} \right)$$ C) $$2\left( {s + 4} \right)$$ D) $$4\left( {\frac{{s + 8}}{{s + 3}}} \right)$$

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Answer & Solution

Answer: Option C

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28

The main purpose of feedback in a control system is

A) To have a reduced time constant B) To make the system more stable C) To decrease the response error D) Sensitivity of the system is increased

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Answer & Solution

Answer: Option B

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29

In control systems, we have
1. Nyquist Criterion
2. Bode plot
3. Root locus plot
4. RH-Criterion
Which of the above are in time domain?

A) 1 and 2 only B) 2 and 4 only C) 1 and 3 only D) 3 and 4 only

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Answer & Solution

Answer: Option D

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30

In a feedback control system, phase margin (PM) is:
1. Directly proportional to ξ
2. Inversely proportional to ξ
3. Independent of ξ
4. Zero when ξ = 0
Which of the above statements are correct?

A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1 and 4

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Answer & Solution

Answer: Option D

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Control Systems MCQ Questions & Answers | ECE